TM 11-5820-538-12
DEPARTMENT
OPERATOR
OF
AND
THE
ORGANIZATIONAL MAINTENANCE MANUAL
INCLUDING REPAIR PARTS LIST
ARMY TECHNICAL MANUAL
MAST AB-577/GRC
AND EXTENSION
MAST MK-806/GRC
KIT,
I
This copy is a reprint which includes current
pages from Changes l through 3.
HEADQUARTERS,
DEPARTMENT
JUNE
196
7
OF
THE
ARMY
WARNING
PERSONNEL USING THIS EQUIPMENT SHOULD BE FAMILIAR WITH THE
REQUIREMENTS OF TB SIG 291 BEFORE ATTEMPTING INSTALLATION
AND DISASSEMBLY OF THE EQUIPMENT COVERED IN THIS MANUAL.
FAILURE TO FOLLOW THE REQUIREMENTS OF TB SIG 291 COULD
RESULT IN INJURY OR DEATH.
TM 11-5820-538-12
C3
Change
No.
3
Operator
(NSN 5820-00-892-3862)
AND EXTENSION
(NSN 5985-00-691-2344)
TM 11-5820-538-12,13 June
1.
New or
the vertical
2.
Remove
3. File this change sheet in front of the publication.
revised material
bar
is
placed opposite
and
insert pages
1967,
is
is
indicated
the
as
indicated below:
Remove
None
1-1 and
1-5 and
2-1 and
2-9 and 2-10
2-15 and 2-16
2-19 and 2-20
Figure 2-18
3-1 and
A-1
B-3 through
changed
by a
as
vertical
follows:
bar in the
identification number
1-2
1-6
2-2
3-2
B-5
and
Organizational
Maintenance
Manual
MAST AB-577/GRC
KIT,
MAST MK-806/GRC
Current
as
of
February
margin. Where
and
title.
Insert
A, B and
1-1 and
1-5 and
2-1 and
2-9 and 2-10
2-15 and 2-16
2-19 and 2-20
Figure 2-18 (foldout)
3-1 and
A-1/(A-2 blank)
B-3 through
C
1-2
1-6
2-2
3-2
1983
an
entire chapter, section,
B-5/(B-6
blank)
HEADQUARTERS
DEPARTMENT OF THE ARMY
WASHINGTON,
DC, 21 November
or
illustration
is
added
1983
or
revised,
By Order of the Secretary of the Army:
Official:
ROBERT
Major
General,
The
Distribution:
To be distributed in accordance with DA form
M.
JOYCE
United States Army
Adjutant
General
JOHN
A.
WICKHAM
General,
12-51,
Operator Maintenance requirements for AB-577/GRC.
United States Army
Chief of Staff
JR.
By Order of the Secretary of the Army:
Official: Chief of Staff
Major General. United States Army
DISTRIBUTION:
To
be
distributed
A&-577/GRC
ROBERT M. JOYCE
The Adjutant General
in
accordance with
JOHN A. WICKHAM JR.
General, United States Army
DA
Form 12-51.Operator Maintance rqrs
for
*TM 11.5820-538-12
TECHNICAL
NO.
11-5820-538-12
EXTENSION KIT, MAST MK-806/GRC (NSN 5985-00-691-2344)
CHAPTER
Section
CHAPTER
Section
CHAPTER
Section
CHAPTER
MANUAL
I
DEPARTMENT
WASHINGTON,
HEADQUARTERS
OF
DC,
is
OPERATOR'S AND ORGANIZATIONAL MAINTENANCE MANUAL
MAST AB-577/GRC (NSN 5820-00-892-3862)
1. INTRODUCTION
I.
General
Scope
1-1 1-1
Indexes
Forms
Reporting
Reporting equipment improvement recommendations (EIR)
II.
Description
Purpose
Technical characteristics
Components
2. INSTALLATION
I.
Service
Unpacking
Checking unpacked equipment
II.
Installation Procedures
Adjustment
Layout
Mounting first mast section
Erection
Raising mast
Antenna azimuth adjustment
T-bar
Antenna cable connections
Protecting launcher
3. MAINTENANCE INSTRUCTIONS
I.
Operator's Maintenance
Scope
Preventive maintenance checks
Operator's daily preventive maintenance checks
II.
Organizational maintenance
4.
DISASSEMBLY, SHIPMENT, AND LIMITED STORAGE
General
5. DEMOLITION
Authority
of
publications
and
records
of
errors
and
and use 1-5 1-1
1-7 1-4
on
Receipt
2-1 2-1
of
and depression angles
Attaching antenna cables
guy
of
Scope
of
Organizational monthly preventive maintenance checks
services chart
Cleaning
Mast disassembly
Packing
Methods
Antenna AT-903/G
and
installation
of
launcher
2-8 2-19
assembly placement
operator's maintenance
organizational maintenance
and
Touchup Painting
4-1 4-1
for
shipment
OF
for
demolition
of
destruction
1-2 1-1
1-3 1-1
1-4 1-1
Data
1-6 1-2
of
Equipment
2-2 2-1
for
... 2-3 2-4
of
guy anchors
and
to
2-7 2-17
in
..
4-2 4-1
MATERIEL TO PREVENT ENEMY
AT-903/G
2-9 2-29
2-11 2-35
frozen ground areas
or
limited storage
5-1 5-1
5-2 5-1
polarization
2-4 2-5
antenna
and
3-1 3-1
and
3-6 3-2
2-5 2-8
2-6 2-15
adjustment
services periods
3-4 3-1
4-3 4-2
and
2-10 2-34
2-12 2-35
and
1-4.1 1-1
elevation
3-2 3-1
services chart
and
USE
AND
Paragraph Page
3-3 3-1
3-5
3-2
THE ARMY
June 1967
'This manual together with
C
2, 2
December 1963,
March
1963.
C 3, 2
TM
11-5820-461-12,25 October 1966, supersedes
July 1964,
and C 4,14
December 1964;
and TM
TM
11-5820-461-10,22 June 1962, including
11-5820-461-20,
22
June 1962, including
Change
C 1, 28
2 i
TM 11-5820-538-12
APPENDIX
A. REFERENCES A-l
B.
MAINTENANCE ALLOCATION
C.
DELETED
Page
B-1
Change 2
TM 11-582O-5M-12
Figure
1-i.
Afcwt AB-577/GRC, supporting Antenna AT-903/G.
iv
TM 11-5820-538-12
FIXED OPERATION WITH LONG RANGE ANTENNAS
WARNING
TELESCOPING
ANTENNA MAST
TYPICAL TOWER
EXTENDED RANGE DOUBLET ANTENNA
ANTENNA
NEVER ERECT THESE LONG RANGE ANTENNAS DIRECTLY UNDER POWERUNES.
IF YOU MUST ERECT THESE LONG RANGE ANTENNAS NEAR POWERLINES. POWERLINE POLES OR
TOWERS, OR BUILDINGS WITH OVERHEAD POWERLINE CONNECTIONS, NEVER PUT THE ANTENNA
CLOSER THAN TWO TIMES THE ANTENNA HEIGHT FROM THE BASE OF TuE POWERLINE, POLE,
TOWER OR BUILDINGS.
NEVER ATTEMPT
BEFORE ERECTING ANY LONG RANGE ANTENNA, INSPECT ALL THE PARTS MAKING UP THE
ANTENNA KIT. DO NOT ERECT THE ANTENNA IF ANY PARTS ARE MISSING OR DAMAGED.
DO AS MUCH OF THE ASSEMBLY WORK AS POSSIBLE ON THE GROUND.
WHEN ERECTING THE ANTENNA, ALLOW ONLY TEAM PERSONNEL IN THE ERECTION AREA.
MAKE SURE THAT THE AREA FOR THE ANCHORS IS FIRM. IF THE GROUND IS MARSHY OR SANDY,
GET SPECIFIC INSTRUCTIONS FROM YOUR CREW CHIEF OR SUPERVISOR ON HOW TO REINFORCE
THE ANCHORS.
WHEN SELECTING LOCATIONS FOR ANCHORS, AVOID TRAVELED AREAS AND ROADS. IF YOU CANNOT
AVOID THESE AREAS, GET SPECIFIC INSTRUCTIONS FROM YOUR SUPERVISOR AS TO WHAT CLEAR-
ANCE YOUR GUY WIRES AND ROPES MUST HAVE OVER THE TRAVELED AREAS AND ROAD.
TO
ERECT
ANY
LONG RANGE ANTENNA WITHOUT
A
FULL TEAM.
CLEARLY MARK ALL GUY WIRES AND ROPES WITH THE WARNING FLAGS OR SIGNS SUPPLIED BY YOUR
UNIT. IN AN EMERGENCY, USE STRIPS OF WHITE CLOTH AS WARNING STREAMERS.
IF YOU SUSPECT THAT POWERLINES HAVE MADE ACCIDENTAL CONTACT WITH YOUR ANTENNA, STOP
OPERATING, ROPE OFF THE ANTENNA AREA, AND NOTIFY YOUR SUPERIORS.
IF THE WEATHER IN YOUR AREA CAN CAUSE ICE TO FORM ON YOUR LONG RANGE ANTENNA AND ITS
GUY WIRES AND ROPES, ADD EXTRA GUYS TO SUPPORT THE SYSTEM. ROPE OFF THE AREA AND
POST IT WITH WARNING SIGNS LIKE M BEWARE OF FALLING ICE*'
DO NOT TRY TO ERECT ANY ANTENNA DURING AN ELECTRICAL STORM.
KEEP A SHARP EYE ON YOUR ANCHORS AND GUYS. CHECK THEM DAILY AND IMMEDIATELY
BEFORE AND AFTER BAD WEATHER.
Change
3 A
TM 11-5820-538-12
SAFETY STEPS
IS
THE
DO
NOT TRY TO
VICTIM
IF POSSIBLE , TURN
IF
YOU
CANNOT TURN
POWER, PULL, PUSH,
SAFETY USING
TO
OF
FOLLOW
ELECTRICAL SHOCK
PULL
OR
OFF THE
OFF THE
OR
A
WOODEN POLE
LIFT
IF
SOMEONE
GRAB
ELECTRICAL POWER
THE
THE
ELECTRICAL
PERSON
OR A
SOME OTHER INSULATING MATERIAL
INDIVIDUAL
TO
ROPE
OR
SEND
AFTER
FOR
THE
CONTACT WITH
SHOCK, MOVE
AWAY
AND
RESUSCITATION
B Change
3
HELP
INJURED PERSON
AS
THE
THE
SOON
AS
SOURCE
PERSON
POSSIBLE
IS
FREE
OF
A
ELECTRICAL
SHORT DISTANCE
OF
IMMEDIATELY START ARTIFICIAL
WARNING
Adequate ventilation should be provided
while using TRICHLOROTRIFLUOROETHANE.
Prolonged breathing of vapor should be
avoided.
The solvent should not be used near
heat or open flame, the products of decomposition are toxic and irritating. Since
TRICHLOROTRIFLUOROETHANE dissolves
natural oils, prolonged contact with skin
should be avoided. When necessary use
gloves which the solvent cannot penetrate. If
the solvent is taken internally, consult a
physician.
TM 11-5820-538-12
C3
Change
3
TM 11-5820-538-12
C3
CHAPTER
INTRODUCTION
Section
1-1.
Scope
This manual describes Mast AB-577/GRC and Extension
Kit, Mast MK-806/GRC and covers their installation and
organizational maintenance. It includes instructions for
cleaning and inspecting the equipment and lists the parts
available to the organizational category of maintenance.
1-2. Consolidated Index
Blank Forms
Refer to the latest Issue of DA Pam 310-1 to determine
whether there are new editions, changes or additional
publications pertaining to the equipment.
1-3. Maintenance Forms, Records,
a. Reports of
ment Department of the Army forms and procedures
used for equipment maintenance will be those prescribed
by TM 38-750. The Army Maintenance Management
System (TAMMS).
b. Report of
out and forward SF 364 (Report of Discrepancy (ROD)) as
prescribed in AR 735-11-2/DLAR 4140.55/NAVMATINST
4355.73A/AFR 400-54/MCO 4430.3F.
c. Discrepancy in Shipment Report
Maintenance
Packaging
of
Army Publications
and
Reports
and Unsatisfactory Equip-
and Handling
Deficiencies.
(DISREP)
and
(SF
361).
I.
Fill
1
GENERAL
Fill out and forward Discrepancy in Shipment Report
(DISREP) (SF 361) as prescribed in AR 55-38/NAVSUPINST
4610.33C/AFR 75-18/MCO P4610.19D/DLAR 4500.15.
14. Reporting Errors and Recommending Improvements
You can help improve this manual. If you find any
mistakes or if you know of a way to improve the
procedures, please let us know. Mail your letter or DA
Form 2028 (Recommended Changes to Publications and
Blank Forms) direct to: Commander, US Army Communications-Electronics Command and Fort Monmouth,
ATTN:
DRSEL-ME-MP, Fort Monmouth, New Jersey 07703.
In either case, a reply will be furnished direct to you.
1-4.1 Reporting
mendations (EIR)
If your AB-577/GRC and/or MK-806/GRC needs improvement, let us know. Send us an EIR. You, the user, are the
only one who can tell us what you don't like about your
equipment. Let us know why you don't like the design. Put
it on an SF 368 (Quality Deficiency Report). Mail it to
Commander, US Army Communications-Electronics
Command and Fort Monmouth, ATTN: DRSEL-ME-MP, Fort
Monmouth, New Jersey 07703. Well send you a reply.
of
Equipment Improvement Recom-
Section
1-5. Purpose
a. Mast AB-577/GRC (fig. 1-1) is an eight-section antenna
support that can be extended as high as 48 feet (14.63
meters) above the ground. Extension Kit, Mast MK806/
GRC is a five-section mast kit that is mounted on top
of the AB-577/GRC to produce a total height of 75 feet
(22.86 meters).
The use of more than one 25-foot mast
extension kit. (MK-806/GRC) on the Antenna
and Use
WARNING:
II.
DESCRIPTION AND DATA
Mast AB-577/GRC is hazardous and is not
authorized.
b. In some applications, the AB-577/GRC supports
Antenna AT-903/G, a born-type directional antenna. The
AB-577/GRC (and the MK-806/GRC) may be used to
support two AT-903/K's when they are mounted on
Support Antenna AB-720/G (fig. 1-2), which is part of
Radio Set Group AN/TRA-24A (for
Radio Set AN/TRC-24), and Radio Set Group 0A-3668/A/
TRC-24 (for J-band operation of the AN/TRC-24). Refer to
TM 11-5820-287-12 and TM 11-5820-287-34 for additional
information on the AN/TRC-24 series of radio sets.
F-band
operation of
Change 3 1-1
TM 11-5820-538-12
c. The AB-577/GRC may also be used to
support two AB-903/G's when they are mounted
on Support, Antenna AB-957/GRC fig. 1-3). The
AB-957/GRC is similar to the AB-720/G; however, one of the antennas mounted on it can be
rotated after the mast is erected, for more
accurate positioning. Rotation is done on the
ground, using two guys to pull the movable
antenna into the desired direction. The guys are
then tied down to prevent further turning of the
antenna. The AB-957/GRC is normally a part of
Army Area Communications Systems as-
semblages.
d. The AB-720/GRC and the AB-957/GRC are
commonly referred to as
T-bars.
1-6. Technical Characteristics
a. AB-577/GRC.
Type Sectionalized, tubular.
Material Aluminum.
Height:
Maximum expanded 48 feet (14.63 meters).
Collapsed (launcher 95 inches (2.41 meters).
height).
Each mast section ........ 5 feet (1.52 meters).
Guy rope lengths 39 ft, 47 ft, and 56 ft
(11.88,
14.32, and
17.07 meters, repsec-
tively).
Stability ±5 percent of original set-
ting for winds up to 75
1-2 Change 2
TO*
0UY mm
ASSEMBLY
Figure 1-2. Support, Antenna
AB-720IG
in use.
TM
11-5820-538-12
HORIZONTAL
BAR
A. PREPARED
ANTENNA MOUNT
(FIXED
IN
BY LOCK
LOCK
(TO HOLD ANTENNA
MOUNT
PIN)
PIN
IN
LOCK
HOLE
CENTER
POSITION
POSITION)
PIN
BAR
FOR
SHIPMENT.
ANTENNA HOLDERS
CENTER
ANTENNA MOUNT
BAR
ANTENNA MOUNT
(FREE ROTATING,
SIUCONE GREASE
HORN HOLDER
FACILITATE ROTATION)
TO
LOCK
PIN
(TO HOLD ANTENNA
ADAPTER
AB-577/GRC)
USE
IN
U-ROD
OF
B. PARTS LOCATION.
Figure
IS.
Support,
miles
per
hour (65.13
knots; 120.67 kilometers
per hour), under conditions
of %
centimeters)
inch
ice
(1.27
loading.
LOCK
PIN
RETAINING BALL
Antenna
Rotation Azimuth rotation, 360°;
b.
Type Sectionalized, tubular.
Material Aluminum
(2)
AB-957/GRC.
MK-806/GRC.
PULL RING
TM 5820—53S-l9-3«
controlled from ground.
1-3
TM
STAKE
SLEDGE HAMMER
Mwwrr
SECTION
flw mtm
(TOPI
y#s&
ANTENNA
WITH
ANTEMNA
ADAPTED
MAST
SECTIOH
EACH)
DIGGING
BAR
Height:
Maximum
expanded.
Each mast action
Guy rope lengths
m
M
8
7S
ft
<t
f^
(7.M
(1.68
>nd
Mlwi).
iMtr),
M ft
^g.^^^
(SJ.77
«M
*****
Component*
The components of the AB-577/GRC (fig.
X-4) and the MK-806|GRC (fig. 1-6) are
following tables 1-1 and 1-2, respectively.
1-4
Chang* I
TM 11-5820-538-12
Table 1-J. Components of Mast AB-577/GRC
Comimnent Qty National Stock No.
Mast AB-577/GRC (fig. 1-4) 5820-00-892-3862
(This item is nonexpendable)
TM 11-5820-538-12 .... 1
Adapter, antenna: 80063; SM-C-423587 1 5820-00-973-0200
Anchor, guy (screw anchor): 80063; SC-B-423652 .— 3
Roll, tools and accessories (stake roll): 80063; SM-D-423619 1 5140-00-973-0491
Bag, cotton duck: 80063; SM-C-423628 : 1 5820-00-973-0349
Bar, digging: 80063; SM-B-423624 1 5120-00-892-4713
Bar, claw (mast coupler tool): 80063; SM-423604 (fig. 4-1) 1 5820-00-973-0352
Carrier assembly (mast section carrier): 80063;
Clamp,
rim clenching (mast section coupler): 80063; SM-C-423646 8 5340-00 973-0230
Guy assembly (39 ft): 80063; SMrD-423651 3 5975-00-715-0361
Guy assembly (47 ft): 80063; SM-D-423650 3 5975-00-714-8834
Guy assembly (65 ft): 80063; SM-D-423651 ;.... 3 5975-00-715-7932
Guy attachment, top (guy ring assembly): 80063; SM-C-423561 1 4030-00-973-0189
Guy attachment, middle (guy ring assembly): 80063; SM-D-423560 1 4030-00-973-0188
Halyard, antenna (radius rope): 80063; SM-B-423575 1 5820-00-973-0298
Hammer, 6 lb: 80063; SM-C-540011-1 1 5120-00-265-7462
Mast base (launcher): 80063; SM-D-423551 1 5820-00-973-0351
Mast section: 80063; SM-D-423556 8 5985-00-400-7274
Stake, Guy GP-2: 80063; SC-B-61956 4 4030-00-187-5261
Stake, Guy GP-112 . 3 4030-00-291-9354
Winch assembly: 80063; SM-C-423630; includes: 1 3950-00-973-0258
1 ea. Crank handle: 80063; SM-C-423574A - 3950-00-954-0526
1 ea. Gear assembly: 80063; SM-C-540000 3010-00-135-2491
Wrench, spanner: 80063; SM-C-423605 1 5120-00-973-0257
SM-JJ-423552
1 5820-00-973-0350
4O3O-OO-58O-7833
Table 1-2. Extension Kit, Mast MK-806/GRC
Component Qty National Stock No.
Extension Kit, Mast MK-806/GRC (This item is nonexpendable) (fig. 1-5) 5985-00-691-2344
Anchor guy (screw anchor): 80063; SM-B-423652 3 4030-00-580-7833
Bag BG-102A _ 1 8105-00-497-9628
Case, Mast Extension CY-4507/GRC 1 5985-00-226-6230
Coupling,'grooved (mast section coupler): 80063; SM-C-423646 5 5340-00-973-0230
Guy attachment (guy ring assembly): 80063; SM-D-423560 1 4030-00-973-0188
Guy assembly (98 ft lg): 80063; SM-D-424072 3 5445-00-892-9624
Guy assembly (78 ft lg): 80063; SM-D-424071 3 5445-00-892-9625
Mast section: 80063; SM-D-423556 5 5985-00-400-7274
Stake, Guy GP-112 3 4030-00-291-9354
Change
3 1-5
TM 11-5820-538-12
CASE,
EXTENSION
GUY STAKE
GP
412 U
t3 EACH)
MAST
MAST SECTIONS
(S EACH)
SCREW ANCHORS
GUY ASSEMBLY
(6 EACH)
1-6 Change
1
Figure
1-5.
Extension
GUY RING ASSEMBLY
Kit,
Mast MK-806/GRC,
ACCESSORY
BG-I02A
components.
BAG
MAST COUPLER
(5 EACH)
B
TM5820-46M2-33
TM 11-5820-538-12
C3
CHAPTER
2
INSTALLATION
SECTION
Unpacking (4) To unpack the launcher and mast sec-
a. Packaging Data. When packed for shipment, the
components of the AB-577/GRC are packed in wooden
boxes or crates as shown in figures 2-1 through 2-3. The
components of the MK-806/GRC are packed in a similar
manner. The packaging data is given in the following
chart:
Box
No.
AB-577/GRC:
1
of 3
2
of 3
3
of 3
Total weight^AB-577/GRC
MK-806/GRC:
1
of 2
2
of 2
Total weight, MK-806/GRC
tal weight
Package dimensions
241/2 x 14V2 x 15%
401/2
x 13 x 6
97% x 16 9/16
65V2 x 18V4 x 123A
22 x I8V2
x 28
x 16
9/16
I.
SERVICE
ON
RECEIPT
Volume
(cuft)
3.19
1.83
12.89
8.82
377
136
463
OF
EQUIPMENT
tion carrier, pull out the screwdrive nails, six
from the front of the crate, and six from the
rear.
(5) Remove the wooden blocks that were
held in place by the screwdrive nails.
(6) Lift the assembly from the crate.
Contents
Unit
weight
197
327
42
72
58
94
(Ib)
Guy bag and contents.
Stake roll and contents.
Launcher and mast carrier.
Case,
Mast Extension
4507/GRC and contents.
Accessory Bag BG-102A and contents.
of
box
CY
b. Removing Contents. When unpacking equipment
from wooden boxes, proceed as follows:
WARNING
Prevent personal injury when applying or removing steel strapping by wearing heavy
gloves and a protective faceshield. Do not
handle packing cartons by the steel strapping.
CAUTION
Do not attempt to pry off the tops of the boxes.
Damage to the equipment will result.
(1) Remove the nails or staples that
are driven through the wires that hold the
covers closed. Use a nailpuller.
(2) Carefully raise the cover, and fold it
back.
(3) Lift the guy bag and stake roll of the
box.
NOTE
If possible, save the wooden boxes and crates
for future use in packing for shipment or
limited storage.
2-2.
Checking Unpacked Equipment
a. Inspect the equipment for possible damage incurred
during shipment. If damage is present, report it as
instructed in paragraph 1-3b
b. Check to see that the equipment is complete as
listed on the packing slip. If a packing slip is not
available, check the equipment against the basic issue
items list (app. B). Report all discrepancies in accordance
with TM 38-750. Shortage of a minor assembly or part
that does not affect proper functioning.
Change 3
2-1
TM 11-5820-538-12
GUY BAG
AND CONTENTS
SCREW-DRIVE
NAIL
(12)
MAST
AB-
577/6RC
CORRUGATED
PADDING
WIREBOUND
WOOD CRATE
WOOD BLOCK
(3)
Figure 2-1. Typical packaging, guy bag.
STAKE ROLL
ANO CONTENTS
WIREBOUND
BOX
Figure t-t. Typical packaging, stake
Section II. INSTALLATION PROCEDURES
TM§82O-538-l2-l
TM5820-538-I2-2
roll.
METAL
STRAPPING
TM5820-538-12-3
Figure 2-3. Typical packaging, launcher
and mast section carrier.
of the equipment should not prevent use of
the equipment.
c. If the equipment has been used or reconditioned, see whether it has been changed by
a MWO. If the equipment has been modified,
the MWO number will appear on the container.
Check to see whether the MWO number (if
any) and appropriate notations concerning the
modification have been entered in the equipment manual.
Note. Current MWO's applicable to the equipment
are listed in DA Pam 310-4.
Warning: During installation of this equipment, conform to all safety requirements set forth
is IB SIG 291. Injury or DEATH could result from failure to comply with safe practices. In
addition to at least two men erecting the mast, there should be at least three or more men
arailable to hold the ends of the guys while the mast is being erected, particularly when the
ground is wet, frozen, or slippery, and when the winds are blowing at a rate greater than 15
miles per hour (13 knots; 24 kilometers per hour).
2-2
MOUNTING LUOS,
CSCE NOTE
UQT& ' WHE& THE ARROW IS POINT IN 0 UPW&RO, THE
AHTEHHA IS VERTICALLY POLARIZES* WHEN
THE ARROW IS POINTING TO THE RIGHT, THE
5
ANTENNA IS HORIZONTALLY POLARIZED.
NOTE)
Figure 2-4. Antenna AT-903/G, mounting details.
TM 11-5820-538-12
Figure t~5. Antenna AT-903/G, location of components.
2-3.
Adjustment of Antenna AT-903/G for
Polarization and Elevation and
Depression Angles
(figs.
2-4 and 2-5)
Antenna AT-903/G is provided with a re-
movable three-legged mounting frame (fig.
2-4), which is attached to the antenna horn
for either horizontal or vertical polarization,
and also provides for adjustment of the angle
2-4
(elevation and depression) at which the antenna horn is set with respect to the ground.
Poor communciation during radio operation
may require that the antenna angle of eleva-
tion or depression be changed or that the
antenna be changed to the opposite polariza-
tion.
a. Polarization Adjustment (fig. 2-4). Note
that for vertical polarization the mounting
legs
are
mounted
antenna horn
AT-903/G's
ing
by its
zation
Refer
direction whether
is
vertical
to
the
are
on the
as the
antenna connector. Some
marked with
same side
an
the
to or
parallel with
radio site installation instructions
for polarization requirements.
(1)
To
detach
the
mounting frame from
the antenna horn, pull
lockpins from their holes
(2)
Set the
tenna horn
tion. Align
mounting frame
in the
the
desired polariza-
holes
the mounting frame with
the mounting lugs,
and
ball lockpins.
b. Elevation
(fig.
2-5).
and
Refer
Depression Adjustment
to the
radio installation
structions, which should state
which
the
antenna horn should
depression/elevation bracket
intervals;
antenna
the
to be
(1) Loosen
(2) Grasp
ket; lift
zero
(0)
parallel
the
the
to the
locking handle.
depression/elevation brac-
it to
disengage
the mounting frame
for elevation
(4) Tighten
(3) Push
down
the
to
or
the
locking handle.
depression/elevation bracket
engage
is
slot provides
to
depression angle.
the
selected slot.
of the
arrow, show-
antenna polari-
the
ground.
the
three ball
(fig. 2-5).
on the an-
in the
the
the
insert
angle
legs
holes
the
be set. The
slotted
at 2°
for the
ground.
the
slot. Move
the
proper slot
of
in
in-
at
A.
AB-
30-FT
FIRST STEP
SECOND STEP
THIRO STEP
577/ORC
SEC
TM 11-5820-538-12
52-FT
SCO
S
LOCATION
STAKE
-FT
SEC
30-FT SEC
6UY
ANCHORS
20
GUY
'ANCHOR
2-4. Layout and Installation
a. Required Items.
AB-577/GRC, with
GRC,
and
of
select
the
the
the
hammer. Depending
soil, select either stakes GP-112/U
the screw-type and?
ditions,
ground
rock,
cases,
may
(fig.
577/GRC
given
use the
is
composed
ice, etc.,
small trees, large rocks, stumps,
be
used
as
6. Procedure
2-6).
for
Mark
guy
in (1)
below. When
For
or
installation
without
radius rope,
rs. For
screw-type anchors.
of
shale, sandstone, soft
use the
guy
GP-112/U's.
anchors.
Location
the
location
of Guy
anchors, using
the
of
Guy Anchors
of the
the
MK-806/
the
digging
on the
condition
normal soil
If the
In
some
etc.,
Anchors
for the AB-
the
procedures
MK-806/GRC
bar,
or
con-
SMKSS
S.
MK-S06/GRC
Figure
2-6.
is used, proceed
dures
in (1)
sary,
the
location
located
up to 5
GUY
ANCHORS
Layout
below
of
to (2)
are
of the
guy
below after
completed.
guy
feet farther from
anchor positions.
anchors
GUY ANCNOR
TMSt2O-9tt-l»-t
the
If
may
the
mast
obstructions prevent their being located
shown.
to reach
The guy
the
added distance.
assemblies
are
Use
long enough
Stakes GP-2,
proce-
neces-
be
if
as
2-5
TM 11-5820-538-12
Figure $-7. Use of digging bar with screw-type guy anchor.
driven about 3 inches into the ground, to mark
the positions of the guy anchors and the mast.
Note. The radius rope has a loop at each end and a
loop where the 80-foot and 52-foot sections join (A,
fig. 2-6).
(1) When only the AB-577/GRC is to be
2-6
used, proceed as follows:
(a) Mark the proposed mast position
with a GP-2.
(b) Put the loop at the end of the 30-
foot section of the radius rope over
-MAST LOCATION
•
GUY
A.SCREW-TYPE GUY ANCHOR.
•
MAST LOCATION
,GUY
TM 11-5820-538-12
anchor. Take the remaining loop
in the radius rope. Stretch both
sections of the rope, and mark the
second guy anchor position (second
step,
A, fig. 2-6).
(d) Leaving the ends of the radius rope
looped over the same two stakes,
stretch it in the other direction and
mark the third guy anchor position
(third step, A, fig. 2-6).
(2) When the MK-806/GRC is to be
added to the AB-577/GRC, refer to
B,
figure 2-6 and proceed as follows,
after the guy anchor locations for
the AB-577/GRC ((1) above) have
been completed. Loop the end of the
52-foot section of the radius rope over
the mast location stake. Mark the
position of the three guy anchors for
the MK-806/GRC in line with the
AB-577/GRC guy anchor locations,
52 feet from the mast location stake.
GUY ANCHOR
(STAKE GP-II2/U)
B.GUY
ANCHORS FOR ROCKY SOIL.
Figure 2-8. Guy anchors installed in earth.
TM58 20-538-15-12
the mast location stake, and mark
the position of the first guy anchor
30 feet away (first step, A, fig.
2-6).
(e) Leave the end of the 30-foot section
of the radius rope on the mast loco-
tion stake, and put the loop at the
end of the 52-foot section over the
marker stake for the first guy
c. Installation of Guy Anchors.
(1) When using screw-type anchors:
(a) Loosen the earth's surface with
the digging bar to help start the
guy anchor.
(&) Insert the digging bar through the
anchor eye, and use the bar for
leverage to screw the anchor into
the earth (fig. 2-7).
(c) Start the anchor vertically into the
earth, then slant the top of the rod
approximately 45° toward the mast
base location (A, fig. 2-8).
(d) Screw the anchor into the earth
until the eyelet is at ground level.
(2) When using GP-112/U stakes for
rocky soil:
(a) Use the digging bar and hammer to
drive a hole for the stake no wider
or deeper than necessary. The
slope of the hole should be at approximately a 60* angle, slanted
away from the mast base location
(B,
fig. 2-8).
2-7
TM 11-5820-538-12
(6) Drive the stake into the hole until
the eyelet is at ground level. If
the stake fits loosely in the hole,
pack the hole with earth.
2-5. Mounting First Mast Section and
Antenna
After the guy anchors have been installed
(para 2-4), set up the first mast section in
the launcher and mount the antenna on it.
a. Launcher Preparation.
(1) Open the catches that hold the mast
section carrier in the launcher frame
(fig. 2-9), and lift the mast section
carrier out of the launcher frame
(fig. 2-10).
(2) Remove the mast location stake (A,
fig. 2-6). Position the launcher so
that it is lying on the ground, with
the center of its base at the stake
location, and with the top of the
launcher facing midway between the
second and third guy anchors.
(3) Remove one mast section from the
mast section carrier; set it aside.
(4) Lift the top end of the launcher, and
set the mast section carrier under it
(fig. 2-11).
6. Mounting First Mast Section.
(1) Remove the winch locking pin from
the rear of the elevator platform (A,
fig. 2-12©); secure the pin to the
platform to prevent tangling during
assembly.
(2) Remove the locking pin from the
handbrake handle, and open the handbrake.
(3) Insert the mast section that was pre-
viously set aside, bottom first through
the top of the launcher (B, fig. 212®).
Note. The top of the mast section is
identified by the word UP and an arrow.
The bottom of the mast section has an
arrow pointing to the key in the bottom.
(4) Remove the locking pin from the lock-
ing bar of the winch cable reel (A,
fig. 2-12®), and lock the bar in the
open position.
(5) Slightly lower the elevator platform
on the launcher. Push the mast sec-
tion in until it meets the elevator base
bearing. Lock the handbrake.
c. Mounting a Single AT-908/G.
(1) Check the AT-903/G polarization and
the depression/elevation setting
(para 2-3); adjust as necessary (fig.
2-13).
2-8
m
M**T
LAUNCHER FRAME
Figure 2-9. Mast section carrier and launcher frame.
CATCHES C3E&CH
TM 11-5820-538-12
C3
| Figure
2-10.
Removal of mast section carrier from launcher frame.
EL9BF009
Change 3 2-9
TNI 11-5820-538-12
C3
| Figure
2-11.
Preparation of
(2) Set an open mast section coupler over the top of
the mast section (B, fig. 2-3).
(3) Place the AT-903/G on the end of the mast sec-
tion.
Rotate the AT-903/G until the key in its base seats in
the slot in the mast section; tighten the mast section cou-
pler. The mast section is securely clamped if the mast section coupler cannot be manually turned about the mast
joint. If the mast section coupler can be turned, replace it
with another coupler and again test to ensure a securely
clamped joint. If changing coupler fails to produce a secure
joint, the lower mast section may be defective and should
be replaced.
(4) Proceed to f below.
d. Mounting Two
AT-903/G's.
The antenna adapter and
the top guy ring assembly (fig. 2-12-4) are required. Also
required is a Support, Antenna AB-720/G (para 1-5b) or a
Support, Antenna AB-957/GRC (para
1-5c).
(1) Check the polarization and the depression/elevation settings (para 2-3) of the AT-903/G's; adjust as necessary (fig. 2-13).
(2) Set an open mast section coupler over the top of
the mast section (B, fig. 2-3).
EL9BF0I3
launcher.
(3) Set the antenna adapter on the end of the mast
section (B, fig. 2-3).
(4) Rotate the antenna adapter until the key engages
the slot in the top of the mast section and prevents further
rotation.
NOTE
Some antenna adapters have an arrow pointing to the key.
(5) Tighten the mast section coupler. The mast
section is securely clamped if the mast section coupler
cannot be manually turned about the mast joint. If the
mast section coupler can be turned, replace it with
another coupler and again test to ensure a securely
clamped joint. If changing coupler fails to produce
secure joint, the lower mast section may be defective a»
should be replaced.
(6) Slip the top guy ring assembly over the antenna
adapter (fig. 2-12-4).
(7) To mount an AB-720/G (fig. 1-2), proceed 9"
follows:
(a) Set the AB-720/G over the antenna adapter,
and rotate it until it is seated.
2-10
Change 3
TM 11-5820-53S-12
*£m'
Figure 2-12®. Antenna mounting procedure (part 1 of
2-11
2-12
Figure 2-12®. Antenna mounting procedure (part 2 of
Figure 2-12®. Antenna mounting procedure (part S of
2-13
TM 11-5820-538-12
TOP 6U¥ MNtt
ASSEMBLY
2-14
Figure 2-12®. Antenna mounting procedure (part U of
(b) Loosen the antenna clamps on both
arms of the AB-720/G (fig. 1-2).
(c) Set an AT-903/G on one arm of
the AB-720/G. Rotate the AT-
903/G until its key engages in the
slot of the antenna clamp. Tighten
the antenna clamp.
Note. If it is difficult to insert fully
the AT-903/G, remove the paint on the
mating surfaces and apply a light coat of
grease.
(d) Set the second AT-903/G on the
other arm of the AB-720/G. Rotate
the AT-903/G until its key engages
the slot of the antenna clamp.
Tighten the antenna clamp.
(e) Proceed to / below.
(8) To mount an AB-957/GRC (fig. 1-3),
proceed as follows:
(a) On the lockpin in the center bar
(B,
fig. 1-3), press the spring-
loaded button under the pull ring
(to release the retaining balls on
the other end of the pin) and pull
the lockpin out.
(6) Remove the antenna mount from
the center bar and press the pushbutton to reinsert the lockpin.
(c) Set the AB-957/GRC on the an-
tenna adapter until the lockpin engages the slot in the antenna
adapter.
TM 11-5820-538-12
(d) Check to see that the antenna mount
on the left antenna holder is secured with its
lockpin.
(e) Set an AB-903/G on the left antenna
mount. Rotate the AT-903 G until its pin drops
into the slot in the antenna mount.
(/) Put silicon grease or equivalent on the
right antenna mount to facilitate the rotation of
the antenna from the ground.
(g) Set the other AT-903/G on the right
antenna mount. Rotate the AT-903/G until its
pin drops into the slot in the antenna mount. This
antenna is free rotating.
(h) Proceed to / below.
e. Mounting Antenna Other Than AT-903/G.
Adapt the procedures given in c or d above to
mount an antenna other than an AT-903/G. If
the antenna does not have a guy ring assembly
to which the guy assemblies can be attached, use
the top guy ring assembly and antenna adapter
provided with the AB-577/GRC.
f. Attaching Guys to Launcher and Top of
Mast.
(1) Launcher. Attach the three launcher
guys (coded blue) to the launcher (fig. 2-15).
Adjust the length of the two guy assemblies for
the second and third guy anchors (A, third step,
fig.
2-6) close to the actual length (36 feet) required after the launcher is erected. Connect the
snubber end of these guy assemblies to the second
and third guy anchors.
(2) Top guy assemblies. When the MK806/GRC is not used, use the AB-577/GRC top
guy assemblies (coded red). When the MK806/GRC is used, use the MK-806/GRC top guy
assemblies (coded orange).
(a) When a single AT-903/G is used,
attach the three top guy assemblies to the AT903/G (fig. 2-15).
(b) When the AB-720/G is used, attach
the three top guy assemblies to the top guy
ring assembly (fig. 2-12 4 and 1-2). Also attach
the guy assemblies to the ends of the AB-720 G
(fig. 1-2).
(c) When the AB-957/GRC is used (fig.
2-14), attach guys as instructed in (b) above.
Add two more guys (fig. 2-16) so that the movable antenna can be rotated from the ground. If
shackles similar to those shown in figure 2-16
are available, mount them as shown. If shackles
are not available, insert the snap fastener on the
end of a guy through the forward hole in the
front brace, bring it around the bottom of the
brace, and snap it around the guy. Do the same
with another guy, using both smaller holes in
the rear brace.
2-6. Attaching Antenna Cables
Figures 1-2 and 2-14 show typical cable connections to the antenna. Other cables and adapters
may be issued with the radio set; however, in
general they are connected as shown in the illustrations.
a. Attach the snap fasteners of the cable grips
to the ring in the top guy ring assembly as shown
in figure 1-2.
b.
To prevent the CG-718B/U (or equivalent)
from whipping in the wind, attach the cable to
mast with electrical tape.
c. After each cable connection is made, check
to make sure that the joint is locked completely,
and wrap electrical tape over the joint to keep
out water.
d. Set up the cable reel so that the antenna
cable unwinds freely as the mast is put together.
Tie the antenna cable to the mast every three or
four mast sections to prevent the cable from
whipping in the wind.
Change 3
2-15
11-5820^538-12
C3
2-16
I Depression/elevation adjustment, AT~,
AT-903/G.
EL9BF0I
POLARJZATION) ,
MOVABLE
CABLE - -
cmmtrm
COVERS '
TM 11-3820-538-12
Figure 2-U. Use of Support, Antenna AB-957/GRC.
2-7.
Erection of Launcher
After the procedures in paragraph 2-6 have
been performed, erect and set the launcher in
position as given in a through I below:
a. Push a GP-2 into each side of the
launcher to operate as a hinge in raising the
launcher to vertical position (fig. 2-17®). Re-
move the GP-2 that was used to indicate the
center position of the launcher base.
^ 6. Drive a GP-2 into the ground on each
side of the launcher to prevent the launcher
from slipping out of position during erection
(fig. 2-17®).
c. Raise the launcher to vertical position
TMSH0HHHHHIHI9
(fig. 2-17®). The launcher will stand unsupported in the vertical position if the ground
is level.
d. Attach the snubber end of the third guy
assembly to its guy anchor (A, third step, fig.
2-6).
e. Adjust the launcher guys as follows:
(1) Check the target level (fig. 2-17®) to
determine if the launcher is level.
(2) Unscrew the snubber adjustment to
its fully extended position (open)
(fig. 2-17®).
(S) Unlock the snubber clamp, and take
up the slack in the guy (fig. 2-17®).
Lock the snubber clamp.
2-17
TM 11-5820-538-12
2-18
Figure 2-15. Attaching launcher and top guys.
TV,
68?V
W2O- IS
SHACKLE (2)
TM 11-5820-538-12
C3
I Figure
(4) Take up on each snubber adjustment until the
launcher is level.
f. Drive two GP-2 stakes partly into the ground through
the front of the launcher base to prevent the launcher from
shifting position (fig. 2-17-3).
g. Remove the two GP-2 stakes that were used as a
hinge (a above).
h. Install the winch assembly on the launcher frame
j.
2-17-4). Slide the winch shaft lock (located on the rear
or the winch reel supporting frame) (fig. 2-17-5) over the
winch shaft to lock the winch assembly in position. Make
sure that the elevator cable is threaded over the pulley
heels.
L Operate the winch to raise the elevator up to the
2-16.
Location of guys for movable antenna.
FRONT BRACE (2)
EL9BF038
bottom of the mast section.
/ Drive a third GP-2 into the ground through the rear of
the launcher base (fig. 2-17-8).
k. Drive each GP-2 fully into the ground. Check the
target level to make sure that the launcher is still level. If
necessary, adjust the snubber assemblies to control the
tension of the guys.
/. Install the spanner wrench as a foot lever in the
launcher base (fig. 2-17-9).
2-8.
Raising Mast
After the launcher has been erected (para 2-7), install the
mast sections, middle guy assemblies, and guys as
follows:
Change 3
2-19
TM
11-5820-538-12
C3
NOTE
Refer to figure 2-18 to determine the locations
for the middle guy ring assemblies and number
of mast sections required, depending on
whether the AB-577/GRC is being used alone or
with the MK-806/GRC.
WARNING:
If men are not available to hold the ends of the
guy assemblies during erection of the mast in
windy weather, use the following procedures
to safeguard personnel and equipment:
1.
Attach the top guy assemblies to their
respective guy anchors (fig. 2-18), and take up
the slack in the guys (para 2-7e(2) and (3)).
2.
Before each mast section is ready to be
raised (a(1) and (6) below), loosen the guys
enough to allow the mast section to be raised
(a(7) below) and take up the slack in the guys
again when the mast section is elevated.
3. Repeat this procedure for the installa-
tion of each mast section.
a.
First Mast Sections.
(1) Release the handbrake, and operate the winch to
raise the first mast section to the upper limit. The elevator
stop will determine the upper limit. Lock the handbrake.
CAUTION
Always lock the handbrake securely before
lowering the elevator.
(2) Operate the winch to lower the elevator to the
lowest position.
(3) Slip an opened mast section coupler over the
bottom joint of the first mast section (A, fig. 2-19-1). Do not
tighten the mast section coupler.
(4) Set another mast section in place on the elevator
with the UP arrow on top (B, fig. 2-19-1). Make sure that the
bottom of the mast section is seated on the elevator
platform.
(5) Step on the spanner wrench which is being useri
as foot lever, and raise the elevator platform until the mr
section meets the bottom of the mast section above it (,
fig.
2-19-2). Rotate the mast section until its slot sea ts in
the key in the bottom of the upper mast section. The UP
arrow points to the slot in the top of the mast section. Lock
the mast section coupler. The mast section is secur
clamped if the mast section coupler cannot be manua
turned about the mast joint. If the mast section coupler can
be turned, replace it with another coupler and again test to
ensure a securely clamped joint. If changing coupler fails
to produce a secure joint, the lower mast section may be
defective and siiould be reported on Standard Form 368.
(6) Raise the elevator platform about 2 inches with
the winch until the new mast section is resting on the
elevator.
(7) Release the handbrake, and operate the winch to
raise the mast section to the upper limit. Lock the
handbrake.
(8) Repeat the procedures given in (1) through (7)
above to install two more mast sections before the middle
guy assemblies are installed (b below).
b. Middle Guy Assemblies. Refer to figure 2-18 to
determine how many mast sections are required for the
installation,
where the middle guy ring assembly is placed,
and which guy assemblies are used. Note that when the
MK-806/GRC is used, five mast sections are install'
before the middle guys are installed. To install the mic
guys,
use the following procedures:
(1) Raise the last mast section approximately half-
way, and lock the handbrake.
(2) Climb up the rear of the launcher, and place the
middle guy ring around the bottom of the mast section
coupler (B, fig. 2-19-2). Align the guy holes of the middle
guy ring with the location of the guy stakes; put the pin
through the middle guy ring (A, fig. 2-19-3). (The ring
should be free to rotate.)
(3) Connect the top ends of the proper middle guy
assemblies to the middle guy ring (B, fig. 2-19-3). Connect
the other ends of the guy asemblies.
2-20
Change
3
TM 11-5820-538-12
Figure 2-17®. Erection
of
launcher (part
1 of 9).
2-21
TM 11-5820-538-12
2-22
TM ^820-4*<-20 riT{
Figure 2-17®. Erection of launcher (part 2 of 9).
TM ll-5$20-538-!2
Figure 2-17®. Erection
of
launcher (part
3 of 9).
2-23
TM 11-5820-538-12
HSS^^^SS^I.fl":II^P^^Si
2-24
Figure £~i7©. Erection
of
launcher (part
4 of 9).
TM 11-5820-538-12
to the associated guy stake. Put ten-
sion on the guy assemblies (para
2-7e).
(4) Release the handbrake, and operate
the winch to raise the mast to its
upper limit.
c. Last Mast Sections. After the middle guy
ring has been installed, install the remaining
mast sections. Use the procedures given in
a(l) through (7) above.
(1) When the last mast section has been
placed on the elevator platform, align
the arrow in the mast platform base
bearing with the arrow on the bottom mast section. Rotate the base
bearing until its slot engages with
the key in the base of the mast
section.
(2) Release the handbrake, and operate
the winch to raise the mast to its
highest position.
d. Mast Section Carrier.
(1) Remove the spanner wrench from the
base of the launcher.
Figure 2-17®. Erection of launcher (part 5 of 9).
TM' 5820-465-2^-
->7
{/,)
2-25
TM 11-5820-538-12
2-26
Figure 2-17®. Erection
of
launcher (part
6 of 9).
TM 11-5820-538-12
Figure 2-17®. Erection of launcher (part 7 of 9).
2-27
2-28
2-i7®. Erection of launcher (part 8 of 0).
Figure 2-17®. Erection of launcher (part 9 of 9)
TM 11-5820-538-12
top and middle guys.
(2) Check the level of the launcher with
the target level (fig. 2-17®).
(3) Unscrew the snubber adjustment on
each top and middle guy to its fully
extended position (open) (fig. 2-
17®).
(4) Using the snubber clamps (fig. 2-
17®),
adjust the tension of the three
middle guys until the lower half of
the mast is straight.
Note. To aid in vertical alignment of the
mast, observe it from a, distance and com-
pare it with a known vertical object, such
as the corner of a building, another antenna mast, or a straight powerline pole.
(5) Correct any misalignment in the mast
by tightening the snubber adjust-
ments.
(6) Repeat the procedure given in (4)
above for the top guys of the AB-
577/GRC. If the MK-806/GRC is
used, "repeat again for the guys connected to its top.
(7) Recheck the level of the launcher with
the target level. Make sure that all
guys are taut and secure.
(8) If the double antennas are being used
(figs.
1-2 and 2-14), stake the guys
holding the T-bar (fig. 2-18) until
they are relocated during radio system lineup.
(2) Install the mast section carrier of the
AB-577/GRC into the launcher to
serve as a base with the launcher (A,
fig. 2-19©). Lock the mast section
carrier in position by closing the
latches (B, fig. 2-19©).
(3) Release the handbrake, and operate
the winch to lower the mast until its
full weight rests on the mast section
carrier. There should be no tension
in the elevator cable. Lock the hand-
brake.
e. Guy Assemblies.
(1) Make sure that there is slack in the
2-9.
Antenna Azimuth Adjustment
(fig. 2-20)
To point the antenna in the desired direction
or to change its direction, proceed as follows:
a. Release the handbrake.
6. Set the spanner wrench into the holes in
the mast base bearing (fig. 2-20).
c. Rotate the mast until the antenna faces
in the desired direction. (Exact antenna azimuth is achieved during lineup of the radio
system.)
d. Tighten the handbrake.
e. When a movable antenna is used on an
AB-957/GRC, orient it during radio system
2-29
. JBamn«r mast (part 1 of 4).
•»..*..:•
Figure 2-19®. Raising mast (part 2 of
5
I
T
Figure 2-19®. Raising mast (part 3 of
r
, A
Figure 2-19®. Raising mast (part U of
5
CO
L
TM 11-5820-538-12
lineup by pulling on the guys that were at-
tached to it (para 2-5/(2) (c)). Locate the
ground ends of the guys to provide an even pull
by each. Refer to figure 2-18. Normally,
GP-2's will provide enough anchorage. If
high winds prevail, use applicable guy anchors
(para 2-4a).
2-10. T-Bar Guy Assembly Placement and
Adjustment
After the mast has been raised (para 2-8)
2-34
TM582Q-46I-2O"!9
Figure 2-20. Rotating mast (mast section carrier removed for clarity).
TM 11-5820-538-12
and the azimuth for the antenna has been estab-
lished (para 2-9), use the procedures in a and b
below to set the guy anchors for the guy assemblies that are attached to the ends of the T-bar
(if used).
a. Refer to figure 2-18 for the layout of the
guy assemblies with respect to the ends of the
AB-720/G. Install the guy anchors; use the procedures given in paragraph 2-4c.
b.
Connect the guy assemblies to the guy
anchors, and adjust them (para 2-8e (5) through
(7)).
2-11.
Antenna Cable Connections
Refer to the technical manual applicable to the
radio set for instructions on installation of the
antenna cables. The general precautions in a
through c below apply to any installation.
a. The antenna cable should be tied to the
mast before it is connected to the radio set.
b.
The antenna cable may be laid on the
ground or tied up on poles or other supports.
c. The antenna cable should be laid out in such
a route that it does not endanger personnel and
it is not endangered by vehicles.
2-12.
Protecting Launcher in Frozen Ground
Areas
When the launcher is placed on ground that is
frozen, the base is usually severely damaged dur-
ing disassembly when it is pulled and twisted to
break it and the stakes out of the frozen ground.
To prevent this damage, make an expendable
wooden base and put it under the launcher during erection (para 2-7). Then during disassembly
(para 4-2c), the launcher is removed from the
wooden base even if it has to be broken apart
for the purpose. The stakes can be dug out of
the frozen ground later. The wooden base can
also be used in spongy ground areas; in which
case,
its purpose is to provide a broader flat base
for the launcher.
a. During erection, put the wood base on the
bottom of the launcher with the hinge stake
through the launcher and side stringers of the
base (fig. 2-21 and 2-17 1,2). Drive the stakes
into the holes at the corners of the base instead
of the launcher during the erection procedures
(para 2-7). It is not necessary to drive the stakes
far into the ground; they are to hold the wooden
base from shifting.
b.
If the launcher is frozen to the ground during disassembly (para 4-2c), chop away the ice
and snow and break the wooden base to free the
launcher from the wooden base.
CAUTION
Do not pull and jerk the launcher to
break it loose from ice and frozen snow.
The framework is usually severely dam-
aged by such handling.
Change 1 2-35
TM 11-5820-538-12
STAKE GP-2, TEMPORARY,
FOR ERECTION OF LAUNCHER
ANO ANTENNA TO VERTICAL
POSITION
BASE 1/2" PLYWOOD
24"
X 32"
(APPROX)
STAKE GP-2
2 DIAGONALLY PLACED
ON MOUNT (4 TOTAL AT
COMPLETION OF VERTICAL
ERECTION OF LAUNCHER)
STAKE GP-2, TEMPORARY, FOR
ERECTION OF LAUNCHER AND
ANTENNA TO VERTICAL
POSITION
STRINGERS 2"X4M BOAROS NAILED
TO EACH OTHER (USING
2'/2"
FINISHING NAILS) AND TO
BASE (USING l'/
N
FINISHING NAILS)
2
10 EACH, 1/2" DIAMETER
SMALL HOLES MAY BE
USED WITH SHORT
Q /SPIKES OR PITONS FOR
""V FROZEN TERRAIN
2-36
Change
Figure
1
2-21.
Fabrication detail*
of
wooden base
HOLE AT EACH CORNER
7/8" DIAMETER
to be
used with launcher.
EL5820-538-I2-TM-CI-I
CHAPTER 3
MAINTENANCE INSTRUCTIONS
Section I. OPERATOR'S MAINTENANCE
TM 11-5820-538-12
3-1.
Scope of Operator's Maintenance
Operator's maintenance of the AB-577/GRC
and the MK-806/GRC is limited to preventive
maintenance. Daily preventive maintenance
services are listed in paragraph 3-3. This preventive maintenance checks and services chart
outlines functions to be performed daily. These
the References column lists the illustrations,
paragraphs, or manuals that contain detailed
repair or replacement procedures. If the defect cannot be remedied by the operator, higher
category of maintenance or repair is required.
Records and reports of these checks and services must be made in accordance with the requirements set forth in TM 38-750.
checks and services are to maintain Army electronic equipment in a combat serviceable condition; that is, in good general (physical)
condition and in good operating condition. To
assist operators in maintaining combat serviceability, the charts indicate what to check, how
to check, and what the normal conditions are;
3-3. Operator's Daily Preventive Maintenance Checks and Services Chart
Sequence
No.
1
2
3
4
5
6
Item to be
inspected
Guy anchors _
Guys
Launcher
Handbrake
Launcher base
Mast section carrier
Check to see that all guy anchors are firmly em-
bedded in the earth.
Check tension of all guys. The mast should not be
loose from too little tension, nor bowed from too
much tension on some guys.
Check level of launcher, using the target level.
Check to see that the handbrake is firmly locked.
Check to see that the stakes driven through the
launcher base are firmly embedded in the ground.
Check to see that the latches on the mast section
carrier are securely fastened to the launcher.
3-2. Preventive Checks and Services Periods
Operator's preventive maintenance is re-
quired on a daily basis only while the mast is
erected. When the equipment is in transit or
in limited storage, no operator's maintenance
is necessary.
Procedure
Para 2-4c.
Para 2-8e(4) through (7).
Fig. 2-17®.
Fig. 2-12®.
Fig. 2-17®.
B,
fig. 2-19®.
References
Section II. ORGANIZATIONAL MAINTENANCE
3-4. Scope of Organizational Maintenance
Maintenance by the organizational repairman is limited to replacement of those parts
listed in appendix D and to monthly preventive
maintenance (para 3-5). Daily preventive
maintenance checks and services constitute a
part of the monthly preventive maintenance
checks and services and must be performed
concurrently. All deficiencies or shortcomings
will be reported in accordance with the requirements of TM 38-750.
3-1
TM 11-5820-538-12
C3
3-5. Organizational Monthly Preventive Maintenance Checks
Sequence
No.
1
Completeness
Installation
2
Preservation
3
Cleanliness
4
Publications
5
Modifications
6
3-6. Cleaning
a Remove corrosion from metal surfaces with a wire
brush or sandpaper. Apply two thin coats of paint. Refer
to the applicable cleaning and refinishing practices in TB
SIG 364.
Adequate ventilation should be provided
while using TRICHLOROTRIFLUOROETHANE.
Prolonged breathing of vapor should be
avoided.
heat or open flames, the products of
Item to be
inspected
Check to see that the equipment is complete.
If the mast has been erected, check to see that it is
properly installed.
Check all accessible metal surfaces for corrosion.
Remove corrosion, and spot-paint bare spots.
Inspect canvas accessory and anchor-wrap bags for
mildew and fungus.
Check to see that all publications are complete, serv-
iceable, and current.
Check to determine if new applicable MWO's have
been published. All URGENT MWO's must be
applied immediately. All NORMAL MWO's must
be scheduled.
and
Touchup Painting
WARNING:
The solvent should not be used near
Procedure
and
Services Chart
References
Appx B.
Para 2-4, 2-6 through 2-8.
Para 3-6; TB SIG 364.
Para 3-6.
DA Pam 310-1
TM 38-750 and DA Pam
310-1.
decomposition are toxic and irritating. Since
TRICHLOROTRIFLUOROETHANE dissolves natural oils, prolonged contact with skin should
be avoided. When necessary use gloves
which the solvent cannot penetrate. If the
solvent is taken internally, consult a
physician.
b. Remove mildew or fungus from canvas items with a
stiff brush. If necessary, use a cloth dampened with
TRICHLOROTRIFLUOROETHANE (NSN 6810-00-292-9625).
3-2 Change 3
TM 11-5820-538-12
CHAPTER 4
DISASSEMBLY, SHIPMENT, AND LIMITED STORAGE
4-1.
General
The mast must be disassembled when it is
necessary to adjust the antenna depression/
elevation angle, or when it is necessary to dismantle the system. Refer to paragraph 4-2 for
disassembly procedures.
4-2.
Mast Disassembly
a. Antenna Cables.
(1) Disconnect the antenna cables from
the radio set; remove the adapter connectors from the antenna cables, and
store them.
(2) Attach the antenna cable to its reel,
and wind it onto the reel as far as it
will go. Clean the cable with a dry
cloth while it is being wound. As the
mast is being lowered (6 below), con-
tinue to wind and clean the cable.
6. Lowering Mast.
Warning: If personnel are not available to
hold the ends of the guys in windy weather, use
the following procedures to safeguard the personnel and equipment:
1.
Leave the guys connected to their respec-
tive guy anchors until they are disconnected
from the mast.
2.
Just before each mast section is ready to
be lowered ((5) below), loosen the snubber
clamp on each guy. Lower the mast sec-
tion on the launcher. Pull the guys taut,
and v'ghten the snubber clamps again.
(1) Release the mast section coupler tool
(secured to the angle bracket under
the top plate of the launcher frame
(fig. 4-1)) by removing the locking
pin.
(2) Release the handbrake, and operate
the winch to raise the mast sections
to the upper limit. Lock the handbrake.
(3) Loosen the six latches holding the
mast-section carrier to the launcher
(B,
fig. 2-19©), and remove the mast
section carrier.
(4) Place the mast section carrier nearby
so that the mast sections can be placed
into it after their removal.
(5) Release the handbrake, and operate
the winch to lower the mast until the
bottom of the elevator is about 5
inches from the bottom of the
launcher. Lock the handbrake.
(6) Unlock the mast section coupler with
the mast section coupler tool (fig.
4-2), and remove the mast section
coupler.
(7) Operate the winch to lower the eleva-
tor to the base of the launcher.
(8) Remove the mast section, clean it, and
place it in the mast section carrier.
(9) Operate the winch to raise the eleva-
tor to the bottom of the next mast
section.
(10) Repeat the procedures in (2) through
(9) above to remove the remaining
mast sections. Use the procedures in
(11) below to remove the middle guy
ring assemblies.
(11) To remove the middle guy assemblies,
lower the mast section on which the
middle guy assembly is attached
way into the launcher, and lock the
handbrake. Climb up the rear of the
launcher; disconnect the middle guys,
and remove the middle guy ring assembly (fig. 2-19®).
half-
4-1
TM 11-5820-538-12
(12) Lower
the antenna
inches from
Lock
the
first mast section
is
the top of the
the
handbrake.
c. Lowering Launcher.
(1) Climb
and disconnect
(2) Remove
antenna cable,
on
up the
the
its
reel. Remove
and store
rear
the
cable grip
and
it in its
the radio equipment.
(3) Remove
the mast
move
semblies from
(4) Wind
the top guy
and
from
the
other ends
up
each
the guy
guy on its
sembly, cleaning
hold
the guy
assembly with
coiled
the
the snubber assembly.
(5) Rock
(6) Move
the
out
the
GP-2
of the
the
launcher slightly
stakes,
ground.
mast section carrier
position that will provide a base
which
to
rest
the top of the
after
it is
lowered.
(7) Install
a GP-2
the launcher base
pin.
Drive
two GP-2
proximately 5 inches into
(fig. 2-17®).
(8) Lower
the
launcher until
the mast section carrier
2-12®).
d.
Antenna
and
First Mast Section Removal.
(1) Single AT-903/G. Loosen
section coupler with
coupler tool. Remove
and mast section coupler.
(2)
AB-720/GRC or AB-957/GRC.
(a) Unscrew
the
remove each AT-903/G.
(6) Remove
the
T-bar from
the mast.
so
that
approximately
12
launcher.
of the
launcher,
antenna cables.
of the
reel
in the
the
cable adapter,
long
cable
assigned place
assemblies from
the
launcher.
Re-
of the guy as-
anchors.
snubber
it in the
up on the
process;
snubber
chain attached
to
loosen
and
pull
the
stakes
to a
launcher
stake into each side
to act as a
stakes
the
it
hinge
ap-
ground
rests
(B, fig.
the
mast
the
mast section
the
AT-903/G
antenna clamps,
and
the top of
in
as-
to
on
of
on
(c)
On the
mast section coupler with
coupler tool; remove
tion coupler
(3) First mast section.
(a) Release
the first mast section from
launcher.
(6) Operate
elevator platform
limit. Insert
rear
of the
sert
the
brake
(B, fig.
(c) Position
tool over
top
of the
place with
e. Disassembly
(1) Remove
used
of
the GP-2
as
hinges from
launcher.
(2) Pull back
fig.
2-17®),
(fig. 2-17®).
(3)
Set the
mast section carrier
launcher,
(fig.
2-9).
/. Removal
(1)
of Guy
To
remove a screw-type anchor, insert
the digging
eye
and use it for
the anchor from
(2)
To
remove Stake GP-112/U, loosen
the stake
the hammer. Pull
the earth.
(3) Clean each anchor.
4-3.
Packing
for
Storage
a. Pack
cessory bags
6.
available, insert
or crates (figs.
covers with nails
all
If the
accessories
or
cases (figs.
original wooden containers
the
2-1
or
AB-720/GRC, loosen
the
the
mast
and
antenna adapter.
the
handbrake,
the
winch
the
and
to
to the
locking
remove
raise
upper
pin in the
elevator platform.
locking
pin in the
2-12®).
the
mast section coupler
the
angle bracket
launcher,
the
locking
and
pin (fig. 4-1).
at the
keep
Launcher.
stakes that were
the
bottom
the
winch shaft latch
and
remove
the
in the
and
lock
the six
catches
Anchors.
bar
through
leverage
the
by
tapping
Shipment
in
the
the
anchor
to
unscrew
earth
(fig. 2-7).
the
eyelet with
anchor from
or
Limited
their proper
1-4 and 1-5).
mast units
through
in
2-3).
their boxes
Fasten
staples.
the
mast
sec-
the
the
In-
hand-
it in
of the
(A,
winch
ac-
are
the
4-2
TM 11-5820-538-12
Figure U-l* Releasing mast section coupler tool
c. If no original containers are available,
construct those required in accordance with
the dimensions given in the chart in paragraph
2-la. The materials required, in addition to
the wooden crate shown in figure 2-3, follow:
(1) One wooden block, 14i/8 by 4% by
113/16 inches.
(2) One wooden block, 14V8 by 2% by
113/16 inches.
(3) One wooden block, 16 9/16 by 2% by
113/16 inches.
(4) Corrugated padding, 62% inches by
1%
inches by 5/32 inch.
(5) Strapping metal, 138 inches by y
inch.
4-3
2
TM 11-5820-538-12
Figure
U-%.
Unlocking mast section coupler.
TM 11-5820-538-12
CHAPTER 5
DEMOLITION OF MATERIEL TO PREVENT ENEMY USE
5-1.
Authority for Demolition
Demolition of the equipment will be accomplished only upon the order of the commander. The destruction procedures outlined
in paragraph 5-2 will be used to prevent fur-
ther use of the equipment.
5-2. Methods of Destruction
The construction of the equipment is such
that destruction methods are limited to distorting the mast sections, their carrier, and
the launcher and cutting the guys into pieces.
a. Bend. Use a heavy sledge hammer to
bend the mast sections, the launcher, and the
mast section carrier. Flatten the mast sections
as much as possible in the time available. Also
bend the guy snubbers.
b.
Cut. Use an axe or handaxe to cut the
guys into as many pieces as possible in the
time available.
c. Dispose. Bury or scatter the destroyed
parts in slit trenches or foxholes, or throw
them into streams.
5-1
APPENDIX
A
REFERENCES
TM
11-5820-538-12
C3
Following
personnel
is a
list
of the
AB-577/GRC and
DA Pam 310-1
"(38-100
SIG
291
TB SIG
364
TM 9-213
TM 11-486-6
TM 11-5820-287-12
TM 11-5820-287-20P
TM 11-5820-461-12
TM 11-5820-538-20P
TM 38-750
of
applicable references that should
the
MK-806/GRC:
Consolidated Index
Preservation,
of
Army Publications and Blank Forms.
Packaging and Packing Materials, Supplies, and Equipment Used
Safety Measures To Be Observed When Installing and Using Whip Antennas, Field Type Masts,
Towers, Antennas, and Metal Poles That Are Used With Communication, Radar, and Direction
Finder Equipment.
Field Instructions
Painting Instructions
for
Painting and Preserving Electronics Command Equipment.
for
Electrical Communications Systems Engineering: Radio.
Operator's and Organizational Maintenance Manual:
Radio Sets AN/TRC-24 (NSN 5820-00-503-1133), AN/GRC-75 (5820-00-581-2104), AN/GRC-78
(5820-00-581-2105), AN/GRC-81 (5820-00-578-5451) and AN/GRC-81A (582000-578-5451); Radio
Terminal Sets AN/TRC-35 (5820-00-503-2578), AN/GRC-76 (582040-557-6260), AN/GRC-79 (5820
00693-9796),
0031);
and
AN/GRC-82 (582000-578-5413); Radio Relay
Radio Repeater Sets AN/GRC-77 (582000-557-6259), AN/GRC-80 (582000-561-6680)
AN/GRC-83 (582000578-5452);
TRA-25A (582000856-9911) and 0A-3668A/TRC-24 (582000-3214).
Organizational Maintenance Repair Parts
AN/GRC-75, AN/GRC-78,
GRC-76,
AN/GRC-79
AN/GRC-77, AN/GRC-80 and AN/GRC-83 and Radio Set Group AN/TRA-25.
Operator
and
Organizational Maintenance Manual: Radio Sets AN/GRC-50(V)1 (NSN 5820-00892-3851), AN/GRC-50(V)2 (582000892-3852), AN/GRC-50(V)3 (582000892-3853), AN/GRC50(V)4 (582000892-3854), AN/GRC-50(V)5 (582000-892-3855), AN/GRC-50A(V)1 (582000
933-6193), AN/GRC-50A(V)2 (582000933^192), AN/GRC-50A(V)3 (582000933-6191) AN/GRC50A(V)4 (582000933^190), AN/GRC-50A(V)5 (582O0O933-6189), AN/GRC-50A(V)6 (582000
936-5480), AN/GRC-50A(V)7 (582000-936-5481), AN/GRC-50A(V)8 (582O0O9354089), AN/GRC50A(V)9 (582000878-8635), AN/GRC-50(V)10 (582000878^634), AN/GRC-50A(V)11 (582000
1364966).
Organizational Maintenance Repair Parts
582000892-3862) and Extension
The Army Maintenance Management Systems (TAMMS).
be
available
Field Use.
and
Radio
AN/GRC-81,
and
AN/GRC-82; Radio Relay
and
Kit,
Mast MK-806/GRC (598540691-2344)
to the
and
operator
and
organizational maintenance
by the
Set
AN/TRM6 (582000569-
Set
Groups AN/TRA-25 582000776-5406),
Special Tools List: Radio Sets AN/TRC-24,
Army.
AN/GRC-81A; Radio Terminal Sets AN/TRC-35, AN/
Set
AN/TRC-36; Radio Repeater Sets
and
Special Tools List
for
Mast AB-577/GRC (NSN
and
AN/
Change 3
A-1/(A-Z blank)
APPENDIX B
MAINTENANCE ALLOCATION
Section I. INTRODUCTION
B-1.
General
This appendix provides a summary of the
maintenance operations for Mast, AB-577/GRC
and Extension Kit, Mast MK-806/GRC. It authorizes categories of maintenance for specific
maintenance functions on repairable items and
components and the tools and equipment required to perform each function. This appendix
may be used as an aid in planning maintenance
operations.
B-2. Maintenance Function
Maintenance functions will be limited to and
defined -as follows:
a. Inspect To determine the serviceability of
an item by comparing its physical, mechanical,
and/or electrical characteristics with established standards through examination.
6. Test. To verify serviceability and to detect
incipient failure by measuring the mechanical
or electrical characteristics of an item and
comparing those characteristics with prescribed
standards.
c. Service. Operations required periodically to
keep an item in proper operating condition; i.e.,
to clean (decontaminate), to preserve, to drain,
to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed air supplies.
d. Adjust. To maintain, within prescribed
limits,
by bringing into proper or exact position,
or by setting the operating characteristics to the
specified parameters.
e. Align. To adjust specified variable elements
of an item to bring about optimum or desired
performance.
/. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test measuring and diagnostic
equipments used in precision measurement.
Consists of comparisons of two instruments, one
of which is a certified standard of known
accuracy, to detect and adjust any discrepancy
in the accuracy of the instrument being compared.
g.
Install. The act of emplacing, seating, or
TM 11-5820-538-12
fixing into position an item, part, module
(component or assembly) in a manner to allow
the proper functioning of the equipment or
system.
h.
Replace. The act of substituting a service-
able like type part, subassembly, or module
(component or assembly) for an unserviceable
counterpart.
i. Repair. The application of maintenance
services (inspect, test, service, adjust, align,
calibrate, replace) or other maintenance actions
(welding, grinding, riveting, straightening, facing, remachining, or resurfacing) to restore
serviceability to an item by correcting specific
damage, fault, malfunction, or failure in a part,
subassembly, module (component or assembly),
end item, or system.
j.
Overhaul. That maintenance effort
(service/action) necessary to restore an item to a
completely serviceable/operational condition as
prescribed by maintenance standards (i.e.,
DMWR) in appropriate technical publications.
Overhaul is normally the highest degree of
maintenance performed by the Army. Overhaul
does not normally return an item to like new
condition.
k. Rebuild. Consists of those services/actions
necessary for the restoration of unserviceable
equipment to a like new condition in accordance
with original manufacturing standards. Rebuild is the highest degree of materiel maintenance applied to Army equipment. The rebuild
operation includes the act of returning to zero
those age measurements (hours, miles, etc.)
considered in classifying Army equipments/
components.
B-3. Column Entries
a. Column i, Group Number. Column 1 lists
group numbers, the purpose of which is to
identify components, assemblies, subassemblies, and modules with the next higher
assembly.
6. Column 2, Component/Assembly. Column 2
contains the noun names of components, as-
Change 2 B-1
TM 11-5820-538-12
semblies, subassemblies, and modules for which
maintenance is authorized.
c. Column 3, Maintenance Functions. Column
3 lists the functions to be performed on the item
listed in column 2. When items are listed without
maintenance functions, it is solely for purpose of
having the group numbers in the MAC and
RPSTL coincide.
d. Column
specifies, by the listing of a "work time" figure in
the appropriate subcolumn(s), the lowest level of
ihaintenance authorized to perform the function listed in column 3. This figure represents
the active time required to perform that maintenance function at the indicated category of
maintenance. If the number or complexity of the
tasks within the listed maintenance function
vary at different maintenance categories, appropriate "work time" figures will be shown for
each category. The number of task-hours
specified by the "work time" figure represents
the average time required to restore an item
(assembly, subassembly, component, module,
end item or system) to a serviceable condition
under typical field operating conditions. This
time includes preparation time, troubleshooting
time, and quality assurance/quality control time
in addition to the time required to perform the
specific tasks identified for the maintenance
functions authorized in the maintenance allocation chart. Subcolumns of column 4 are as
follows:
C — Operator/Crew
O —Organizational
F — Direct Support
H — General Support
D — Depot
e. Column 5, Tools and Equipment. Column 5
U>
Maintenance Category. Column 4
specifies by code, those common tool sets (not
individual tools) and special tools, test, and
support equipment required to perform the
designated function.
/. Column 6, Remarks. Column 6 contains an
alphabetic code which leads to the remark in
section IV, Remarks, which is pertinent to the
item opposite the particular code.
B-4. Tool and Test Equipment Require-
ments (Sec III)
a. Tool or Test Equipment Reference Code. The
numbers in this column coincide with the
numbers used in the tools and equipment
column of the MAC. The numbers indicate the
applicable tool or test equipment for the main-
tenance functions.
b.
Maintenance Category. The codes in this
column indicate the maintenance category
allocated the tool or test equipment.
c. Nomenclature. This column lists the noun
name and nomenclature of the tools and test
equipment required to perform the maintenance functions.
d. National/NATO Stock Number. This column
lists the National/NATO stock number of the
specific tool or test equipment.
e. Tool Number. This column lists the manufacturer's part number of the tool followed by
the Federal Supply Code for manufacturers
(5-digit) in parentheses.
B-5. Remarks (Sec IV)
a. Reference Code. This code refers to the
appropriate item in section II, column 6.
6. Remarks. This column provides the required explanatory information necessary to
clarify items appearing in section II.
B-2 Change 2
SECTION
II
MAINTENANCE ALLOCATION CHART
MAST,
AB-577/GRC AND EXTENSION KIT, MAST MK-806/GRC
FOR
TH 11-5820-538-12
(1)
GROUP
NUMBER
00
01
0101
0102
0103
0104
0105
02
03
04
00
COMPONENT/ASSEMBLY
(2)
MAST AB-577/GRC
LAUNCHER
BRAKE ASSEMBLY (MALE)
BRAKE ASSEMBLY (FEMALE)
ELEVATOR ASSEMBLY
GUIDE ASSEMBLY
WINCH DRIVE ASSEMBLY
CARRIER ASSEMBLY
ACCESSORY ASSEMBLIES
GUY ASSEMBLIES
EXTENSION KIT, MAST MK-806/GRC
(3)
MAINTENANCE
FUNCTION
Inspect
Service
Repair
Repa
i r
Overhaul
Inspect
Replace
Repair
Replace
Repair
Replace
Repa
i r
Replace
Repair
Replace
Repair
Replace
Repair
Replace
Repair
Repair
Repair
Inspect
Service
Repair
1.5
1.5
0.5
(4)
F
o
1.5
1.5
1.0
1.0
1.0
1.0
1.0
1.0
1.5
1.0
1.5
1.0
1.0
MAINTENANCE CATEGORY
C
0.20
0.20
0.10
0.15
0.15
0.10
0.10
1.5
(5)
TOOLS
D
H
2.5
AND
EQPT.
1
2,3
4 thru 7
1
2,3
(6)
REMARKS
A
B
C
D
1
2,3
1
2,3,6
1
2,3
1
2,3
1
2,3
1
2,3
i
i
C
C
i
!
B
C
Change
3 B-3
TM 11-5820-538-12
TOOL
OR
EQUIPMENT
REF CODE
TEST
MAINTENANCE
CATEGORY
0
F,
D
F,
D
D
D
0
D
SECTION JIT TOOL AND TEST EQUIPMENT REQUIREMENTS
MAST, AB-577/GRC
TOOL
KIT,
ELECTRONIC EQUIPMENT TG-101/G
TOOL
KIT,
ELECTRONIC EQUIPMENT TG-100/G
TOOL
KIT,
ELECTRONIC EQUIPMENT TG-105/G
DYNAMOMETER: DILLON PART
TURNBUCKLE: BREMER-TICHNER, TYPE 518X12
50-LB SCALE: JOHN CHATILLON & SONS, TYPE
USAECOM MECHANICAL GAGE
FOR
AND
EXTENSION
NOMENCLATURE
NO.
AN26996
NO.
324361
KIT,
MAST MK-806/GRC
100
NATIONAL/NATO
STOCK NUMBER
5180-00-064-5178
5180-00-605-0079
5180-00-610-8177
TOOL NUMBER
B-4 Change
3
SECTION IV. REMARKS
REFERENCE
CODE
REMARKS
PREVENTIVE MAINTENANCE: INSPECT MAJOR ASSEMBLIES, GUYS, GUY ANCHORS, MAST SECTIONS, BASE
STAKES, LEVEL.
CLEAN.
REPAIR BY REPLACEMENT OF MAJOR ASSEMBLIES.
ALL REPAIRS.
Change 3
B-5/(B-6
blank)
TM 11-5820-538-12
By Order
of the
Secretary
of the
Official:
KENNETH
G.
WICKHAM,
Major General, United States Army,
The Adjutant General.
Distribution:
Active Army:
USASA
CNGB
CC-E
Dir
CofEngrs
TSG
Cof Spts
USAARENBD
USAAESWBD
USARADBD
USACDCEA
USACDCJEC
USACDCCBRA
USACDCCEA
USACDCCEA
USACDCOA
(2)
(1)
(7)
of
Trans
(1)
(1)
(1)
(1)
(2)
(5)
(5)
(1)
(10)
(1)
(1)
(Ft
(1)
USACDCQMA
USACDCTA
USACDCADA
USACDCARMA
USACDCAVNA
USACDCARTYA
USACDCSWA
USAMC
USCONARC
ARADCOM
ARADCOM
OS
Maj
USARYIS
USARHAW
LOGCOMD
USAMICOM
USASTRATCOM
USAESC
MDW
(1)
Armies
Seventh
Eighth
Corps
(2)
USAC
(3)
Instl
(2)
Ft Hancock
Ft Gordon
Ft Huachuca
WSMR
(1)
(5)
(5)
(5)
Rgn (2)
Comd
(5)
(5)
(2)
(4)
(70)
(2)
except
USA (5)
USA (5)
except
(10)
(5)
(1)
(1)
(1)
(4)
(4)
Huachuca)
(1)
(1)
(1)
(4)
(10)
(1)
Army:
HAROLD
General,
Chief
of Staff.
Ft Knox
Svc Colleges
USASESCS
USAADS
USAAMS
USAARMS
USAIS
USAES
USASCS
USASA
USATC Armor
USATC Engr
USATC
USASTC
Army
LBAD
SAAD
TOAD
LEAD
SHAD
NAAD
SVAD
CHAD
ATAD
Gen
Sig
Sig
AMS
WRAMC
Army
USAERDAA
USAERDAW
USACRREL
MAAG (Vietnam)
USACA (Taiwan)
Sig FLDMS
Units
11-67
11-97
11-98
11-117
11-127
11-155
11-157
11-158
(12)
(2)
(90)
(5)
(2)
(5)
(2)
(2)
(5)
Tng Cen & Sch (5)
(2)
Inf (2)
(2)
Dep (2)
Dep (2)
Sec, Gen Dep (5)
Dep (12)
(1)
Pic Cen (2)
org
except
(14)
(30)
(14)
(7)
(3)
(5)
(5)
(3)
(10)
(1)
(2)
(13)
(2)
(2)
under
K.
JOHNSON,
United States Army,
(2)
(5)
(5)
fol
TOE:—2
ea.
TM 11-5820-538-12
11-847 11-592
11-500 (A A-AC) 11-597
11-587 82-56
NG: State AG (8).
USAR: None.
For explanation of abbreviations used, see AR 820-50.
A SIDE VIEW, AB-577/GRC
T
TE1)
LINE-OF- SIGHT
TO NEXT STATION
V
12
0°
-TO
120*
Z'**-™1**
/
/
MX-I874/G OR
65-FT GUYS
NOTES 3.4 8 5)
AB-957/GRC(N0TE 2)
AT-9O3/G (FIXED)-
1
(NOTES 3,4,8 5)
6 SIDE VIEW; AB-577/GRC WITH MK-8O6/GRC
^
GUYS
GUY STAKES
(NOTES 3 8 4)
52
FT.
(NOTED
LINE-OFSIGHT
T
it
GUY STAKE
OF
MAST (NOTE
TO
TM 11-5820-538-12
-AT-903/G (MOVABLE)
FT.
GUY(APPROX
(NOTES 3 8 4)
(NOTES 3 8 5)
TO
HOLD
TOP TWO
I)
NEXT STATION
C3
GUY STAKE
(NOTES
385)
C.
TOP
VIEW
OF
50-FT. MAST; DISTANCES FROM LAUNCHER
Figure
TO GUY
STAKES.
2-18.
Mast erection and guying details.
•filU.S.
D.
TOP
VIEW
GOVERNMENT PRINTING OFFICE: 1985-461-421/21089
OF
75-FT. MAST, DISTANCES FROM LAUNCHER
ELBF001
TO GUY
STAKES.
TM 5820-538-15-31
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