ViaSat 8016 Installation And Operation Manual

Model 8016
11-Meter Earth Station
Antenna Installation
Installation and Operation Guide
Manual Part No. 42S132E
Notice
All Rights Reserved
Model 8016 11-Meter Earth Statio
Installation and Operation Guide
n Antenna Installation
Table of Contents
Table of Contents
Table of Contents .................................................................................................. iii
List of Figures ........................................................................................................ vi
List of Tables ......................................................................................................... vii
Safety Summary ..................................................................................................viii
1 General Information ...................................................................................... 1-1
1.1 Introduction.............................................................................................................1-1
1.2 Mount Description .................................................................................................1-1
1.3 Reflector Description..............................................................................................1-4
2 Installation Procedures.................................................................................. 2-1
2.1 General.....................................................................................................................2-1
2.2 What to do About Visible Loss or Damage ........................................................2-1
2.3 What to do About Concealed Damage................................................................ 2-1
2.4 How to Inventory Equipment Received .............................................................2-2
2.5 How to Return Equipment.................................................................................... 2-2
2.6 General Mechanical Safety Summary..................................................................2-3
2.6.1 Emergency Plan ...................................................................................................... 2-4
2.7 General Electrical Safety Summary......................................................................2-4
2.7.1 Resuscitation ...........................................................................................................2-4
2.8 Recommended Tools and Equipment .................................................................2-4
2.9 Fastener Information..............................................................................................2-6
2.10 Recommended Installation Sequence..................................................................2-7
2.11 Site Preparation.......................................................................................................2-8
2.12 Assembly of Reflector, Spars, and Subreflector .................................................2-9
2.12.1 Installation of Trusses and Intercostals.............................................................2-10
2.12.2 Installation of the Spars and Subreflector.........................................................2-12
2.12.3 Truss Alignment ...................................................................................................2-13
2.12.4 Installation of Reflector Panels ...........................................................................2-14
2.12.5 Reflector Alignment ............................................................................................. 2-34
42S132E iii
Table of Contents
2.12.6 Subreflector Alignment .......................................................................................2-37
2.13 Mount Installation................................................................................................2-39
2.13.1 Elevation Actuator Installation...........................................................................2-39
2.13.2 Erection of Antenna Mount ................................................................................2-39
2.13.3 Installation of Azimuth Actuator – Model 8133, 120° Travel.........................2-41
2.13.4 Installation of Azimuth Actuator - Model 8133, 180° Travel .........................2-42
2.14 Grouting Baseplate to Foundation.....................................................................2-79
2.14.1 Hot Weather Grouting.........................................................................................2-80
2.14.2 Cold Weather Grouting ....................................................................................... 2-80
2.14.3 Grouting Procedures............................................................................................2-81
2.15 Assembly and Installation of Mount Platform................................................. 2-82
2.16 Reflector Installation ............................................................................................2-83
2.17 Typical Feed Installation .....................................................................................2-85
2.17.1 Installation of Subreflector to Subreflector Mounting Frame .......................2-86
2.18 Installation of Reflector Hub Cover...................................................................2-91
2.19 Installation of Feed Waveguide..........................................................................2-91
2.20 Electrical Installation............................................................................................ 2-91
2.21 Corrosion Protection After Installation.............................................................2-92
3 Operation......................................................................................................... 3-1
3.1 General.....................................................................................................................3-1
3.2 Satellite Pointing Procedure..................................................................................3-1
3.2.1 Elevation Pointing .................................................................................................. 3-1
3.2.2 Azimuth Pointing...................................................................................................3-1
3.2.3 Signal Peaking Procedure......................................................................................3-2
3.3 Subreflector Adjustment........................................................................................3-3
4 Maintenance.................................................................................................... 4-1
4.1 General.....................................................................................................................4-1
4.2 Periodic Maintenance ............................................................................................4-1
4.2.1 Weekly Maintenance..............................................................................................4-1
4.2.2 Monthly Maintenance............................................................................................4-1
4.2.3 Bi-Monthly Maintenance.......................................................................................4-2
4.2.4 Quarterly Maintenance..........................................................................................4-2
42S132E iv
Table of Contents
4.2.5 Yearly Maintenance................................................................................................4-3
4.3 Corrosion Protection .............................................................................................. 4-4
4.3.1 Touch-up Painting of Non-Reflective Surfaces ..................................................4-4
4.3.2 Touch-Up Painting of Reflective Surfaces ..........................................................4-5
4.3.3 Fasteners ..................................................................................................................4-6
5 Options............................................................................................................. 5-1
5.1 General.....................................................................................................................5-1
5.1.1 De-Icing Options.....................................................................................................5-1
5.1.2 Lightning Protection Option.................................................................................5-1
5.2 Feed Options ...........................................................................................................5-2
42S132E v
Table of Contents
List of Figures
Figure 1-1. Typical Antenna System....................................................................................................1-2
Figure 2-1. 11-Meter Reflector Assembly, 516469B .........................................................................2-17
Figure 2-2. 11-Meter Ku-band Reflector, Subreflector, and Spar
Installation, 723959-5001x01 ........................................................................................................2-22
Figure 2-3. 11-Meter Motorized Hub Assembly, 514326G.............................................................2-28
Figure 2-4. 11-Meter Reflector and Subreflector Alignment ..........................................................2-38
Figure 2-5. Model 8020-120 Mount Installation Assembly, 517098C............................................2-44
Figure 2-6. Model 8020-180 Mount Installation Assembly, 517097C............................................2-50
Figure 2-7. Model 8020-120 Mount Structure Assembly, 477697D ............................................... 2-56
Figure 2-8. Model 8020-180 Mount Structure Assembly, 476309D ............................................... 2-59
Figure 2-9. Model 8132-1 Elevation Actuator Assembly, 511956B................................................ 2-62
Figure 2-10. Model 8133-1 (1 HP) Azimuth Actuator Assembly, 477503C..................................2-64
Figure 2-11. Model 8133-1 (5 HP) Azimuth Actuator Assembly, 480239D..................................2-66
Figure 2-12. Model 8133-180 (1 HP) Azimuth Actuator Assembly, 477506D..............................2-68
Figure 2-13. Model 8133-180 (5 HP) Azimuth Actuator Assembly, 482052E ..............................2-74
Figure 2-14. Location of Grouting......................................................................................................2-79
Figure 2-15. Hoisting Reflector and Spars ........................................................................................2-85
Figure 2-16. Hoisting Feed..................................................................................................................2-86
Figure 2-17. Model 8009A-C-4P Feed Installation, 514687B ..........................................................2-87
Figure 2-18. Model 8009A-C-4PC Feed Installation, 517525A.......................................................2-89
Figure 2-19. Polarization Drive Assembly, 1017724_002...............................................................2-93
Figure 2-20. 9/11-Meter Hub Cover Installation Drawing, 521988A ...........................................2-98
Figure 2-21. Feed and Waveguide Installation – 9-Meter C-band 4P, 550847A........................2-101
Figure 3-1. Feed, Reflector, and Subreflector Distances ...................................................................3-5
Figure 3-2. Typical Antenna Patterns for Various Subreflector Positions .....................................3-6
Figure 5-1. Lightning Protection Installation, 9/11-Meter Antenna System, 517224....................5-3
42S132E vi
Table of Contents
List of Tables
Table 1-1. Antenna Mount Configurations.........................................................................................1-1
Table 2-1. Tools and Equipment Required For Installation .............................................................2-5
Table 2-2. Torque Values For Antenna Fasteners..............................................................................2-7
Table 2-3. Panel Rough Alignment....................................................................................................2-15
Table 2-4. Final C-band Alignment Target Measurements - Sight Center
of the Middle Diamond................................................................................................................2-35
Table 2-5. Final Ku-band Alignment Target Measurements - Sight Center
of the Middle Diamond................................................................................................................2-35
Table 2-6. ViaSat 11-Meter Reflector Alignment Record................................................................2-36
42S132E vii
Table of Contents
42S132E viii
Safety Summary
SAFETY SUMMARY
Notice
Any service, adjustment, maintenance, or repair of this product must be performed only by authorized technical service personnel.
Prior to installation and use of this product review all safety markings and instructions. When safety precautions or important information is presented in this manual, the information will normally be presented just prior to the point where the hazard is likely to be encountered.
The following symbols are used throughout this manual to bring attention to practices, procedures, and conditions important to the safety of the operator and equipment or to obtaining desirable results from the equipment.
This symbol warns of electrical shock hazards to personnel. Failure to comply with the
NOTE
instructions of such a warning may result in severe injury or death resulting from electrical shock.
This symbol warns of non-electrical hazards to personnel. Failure to comply with the instructions of such a warning may result in severe injury or death.
This symbol warns of hazards to equipment. Failure to comply with the instructions of such a caution may result in damage or destruction of equipment.
This symbol is used to bring attention to installation grounding requirements.
Notes are used to provide clarification, or to alert the reader of possible erroneous results, which may occur if a procedure is not followed as written.
42S132E ix
Safety Summary
42S132E x
Chapter 1 - General Information
1.1 Introduction
This manual contains information needed to properly install, operate, and maintain ViaSat's 11-Meter (11M) Earth Station Antenna. The antenna is eleven meters in diameter. It provides high quality receive/transmit and receive-only capabilities for both domestic and international C-band or Ku­band applications. The antenna consists of an 11M-shaped reflector, a shaped subreflector, and a linearly or circularly polarized feed on a high­strength structural steel elevation-over-azimuth mount. The mount's stiff, rugged construction provides the pointing accuracy needed for proper operation under adverse wind conditions.
Chapter 1
General Information
This chapter of the manual contains general descriptions and specifications on the mount, reflector, feed, and subreflector. Chapters 2 through 4 contain information pertaining to antenna installation, operation, and maintenance. All warnings and cautions should be reviewed before any procedures are performed. Failure to do so may result in personal injury or equipment damage.
ViaSat, Inc. makes every effort to ensure that the information contained herein is correct and complete.
1.2 Mount Description
The 11M reflector can use either of two mounts, the Model 8020-120 and the Model 8020-180 mounts. The mount configurations are described in Table 1-1.
Table 1-1. Antenna Mount Configurations
Mount Required Components Description
Model 8020-120 Model 8084-120 Foundation
Model 8132-M,-1,-2 Elevation Actuators
180° Total Azimuth Coverage, in Three Overlapping 120° Sectors
Model 8133-M,-1,-2 Azimuth Actuators
Model 8020-180 Model 8084-180 Foundation
Model 8132-M,-1,-2 Elevation Actuators
Model 8133-180 Azimuth Actuators
42S132E 1-1
180° Continuous Azimuth Coverage
Chapter 1 - General Information
Optional 120° and 180° mounts are available with precise orthogonal alignment between the azimuth and elevation axes; typically used for TT&C applications.
The Model 8020-120 and Model 8020-180 Mounts provide two-axis (elevation-over-azimuth) adjustment for pointing the antenna. In the elevation-over-azimuth configuration, the antenna rotates about two axes, a vertical azimuth axis and a horizontal elevation axis. Pointing to a geostationary satellite requires that the antenna be moved to a specific angle about the azimuth axis, then to a specific angle about the elevation axis. The
42S132E 1-2
Figure 1-1. Typical Antenna System
Chapter 1 - General Information
required sighting angles for any satellite are given in look-up tables which are readily available.
The mount consists of a 20-foot-tall structural tube that is supported at the top by two diagonal leg braces, which extend to the rear of the antenna. The bottom of the tube is supported by a pivot bearing and is driven at the ground level location by the azimuth actuator. The elevation actuator is located atop the structural tube and behind the reflector hub. The actuator locations are very convenient to access for maintenance.
Grounding cables are provided to ensure system electrical grounding between the antenna reflector and the antenna mount structure. Tapped holes are provided in the mount base plates for attachment to a suitable foundation grounding system.
Included as optional equipment on the mount is a ladder and work platform assembly. These components provide safe and convenient access to the feed electronics inside the antenna hub and to the elevation drive motor for servicing and inspection. The ladder and platform are designed to be fully compatible with OSHA specifications.
The Model 8132-M Elevation Actuator (manual drive), the Model 8132-1 (single speed) and Model 8132-3 Elevation Actuator (variable speed) will provide elevation coverage of 0-degree to 90-degrees.
The Model 8133-M Azimuth Actuator (manual drive), the Model 8133-1 (single speed) and Model 8133-3 (variable speed) Azimuth Actuator will provide azimuth coverage of 180-degrees through three available 120-degree overlapping sectors. The selecting of alternate sectors can be accomplished within two hours by moving the azimuth actuator to an alternate position on the foundation. These actuators are used only with the Model 8020-120 Mount.
The Model 8133-180-1 Azimuth Actuator (single speed drive) and the Model 8133-180-3 (variable speed drive) provide continuous azimuth coverage of 180° and must be used with the Model 8020-180 Continuous Azimuth Coverage Mount. These actuators are used only with the Model 8020-180 Mount.
Manual drive elevation and azimuth actuators are operated manually or with an auxiliary power source such as a drill motor. Motor drive actuators may also be operated manually if required.
The Model 8084-180 and Model 8084-120 foundations are an essential part of the antenna installation. The foundation should be oriented so that the desired pointing angles can be achieved and accurately maintained under maximum wind loads.
The antenna mount is designed to safely support the antenna in winds up to 125 mi/h (201 km/h). The pointing accuracy of the installed antenna is
42S132E 1-3
Chapter 1 - General Information
determined by the stiffness of the mount, the antenna, and the foundation. It is recommended that the foundation be designed for a maximum tilt of
0.15 degrees when the 125 mi/h (201 km/h) wind loads are applied to the antenna. It is imperative that competent engineering assistance be engaged to assure that the foundation is properly designed for the local site conditions and building codes. The contractor does not imply or warrant that the foundation design shown as typical on ViaSat drawings is appropriate for any particular locality or site condition.
The Model 8084-120 Foundation Kit includes thirty-two foundation anchor bolts and an anchor bolt location template. The template accurately locates the three main foundation plates for the mount and three foundation plate locations for the azimuth actuator positions.
The Model 8084-180 Foundation Kit includes twenty foundation anchor bolts and an anchor bolt location template. The template accurately locates the three main foundation plates for the mount and one foundation plate for the azimuth actuator.
A true north-south reference line for the purpose of foundation orientation may be established by reference to: (1) a magnetic compass heading (corrected for declination or variation), (2) a survey from registered benchmarks, or (3) a sighting of Polaris (North Star). This line is used to position the foundation pad and to establish the heading of the foundation anchor bolt pattern. The survey should be done by a qualified surveyor.
The Models 8020-120 and Model 8020-180 Mounts have been designed in accordance with the American Institute of Steel Construction (AISC) specifications for Design, Fabrication and Erection of Structural Steel Buildings as presented in the Manual of Steel Construction, eighth edition (copyright 1980).
1.3 Reflector Description
The reflector, in combination with its shaped subreflector and feed system, is optically designed to yield high efficiency. The reflector consists of 48 precision stretch-formed aluminum panels. The panels are bolted together in the field to form a surface of revolution.
Each reflector assembly consists of a central hub assembly, to which are attached the radial trusses, intercostals, and the reflector panels. Ample space is provided inside the hub for mounting of redundant low-noise amplifiers (LNAs) and switching equipment. The hub has an access cover on the rear surface for convenient service and inspection of the feed electronics. Each reflector panel is aligned independently to ensure accuracy. The radial trusses support the panels and are locked together using the intercostals.
42S132E 1-4
Chapter 1 - General Information
The hub assembly includes a machined plate for attaching the inner row of panels. All the panels are stretch-formed and have rigid back structures that are riveted into place.
The reflector panels are finished with a high reflectance white paint applied over a chromate conversion coating. (Other colors are available as options.) This special paint diffuses solar radiation to minimize subreflector heating from the reflector. The remainder of the equipment is primed and painted with two coats of gloss enamel.
42S132E 1-5
Chapter 1 - General Information
42S132E 1-6
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2.3 What to do About Concealed Damage
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2.5 How to Return Equipment
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WARNING
Electrical shock from voltages used in this system can cause injury or death. Prior to making any electrical connections or performing maintenance and repair, ensure power is removed. Electrical connections should be made only by qualified personnel in accordance with local regulation.
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2.6 General Mechanical Safety Summary
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WARNING
Installation or maintenance of antennas may require persons to work at elevated work stations. Whenever persons are working at eight or more feet above ground and not on a guarded platform, they should wear safety belts with at least one, and preferably two, lanyards, with the exception that trained and qualified persons may work up to 25 feet (7.6 m) if on an approved ladder. In the sentence above, approved usually means that the ladder is tied off once the person has climbed but before work begins.
CAUTION
Assembly and installation of the reflector should only be done during fair weather and low wind conditions.
WARNING
Overhead hazards, either because items may fall or because a person may strike them unintentionally, are typical around construction sites or during installation of large antennas. It is prudent to adopt the following rules:
1. Never stand underneath anything while it is being hoisted.
2. Always wear a hard hat if someone is above you.
WARNING
Ensure that all electrical tools and equipment are properly grounded.
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2.6.1 Emergency Plan
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2.7 General Electrical Safety Summary
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WARNING
Avoid shorting circuits when using metal tools. Some circuits have high current capability which, when shorted, will flash and may cause burns and/or eye injury.
2.7.1 Resuscitation
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Remove all jewelry and exposed metal objects from body and clothing before performing maintenance, adjustments, and/or trouble-shooting. Before working inside the equipment, remove all power, unless power is required to perform procedures. Do not replace parts with power on.
Replacement of fuses or other parts must be done using identical types and ratings. Substitution of non-identical parts may cause safety and fire hazards.
Servicing this equipment may require working with protective covers removed and ac power connected. Extreme caution must be exercised during these procedures.
Death or severe injury may result if personnel fail to observe safety precautions.
2.8 Recommended Tools and Equipment
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2.9 Fastener Information
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NOTE
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2.10 Recommended Installation Sequence
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NOTE
NOTE
Do not attempt to erect the antenna in winds exceeding 25 mi/h (40 km/h). Injury to personnel or damage to antenna may result if erection is attempted in high winds.
After the panels are installed on the reflector assembly, the reflector is very susceptible to moving during windy conditions. Ensure the reflector is properly tied down until the reflector is completely secured on the mount.
2.11 Site Preparation
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WARNING
CAUTION
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2.12 Assembly of Reflector, Spars, and Subreflector
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If it is necessary to walk inside the reflector during assembly, be sure to walk on the portion of the reflector closest to the hub. Avoid putting weight on unsupported parts of the reflector panels. Wear clean soft sole shoes or socks only. Extra care should be taken to protect the painted panel surface.
C/#6#%F( +,2@( =4#'#,%&&-( %"&( #,%&,,#( -$&2/;/2#%/0,-F( $'0G/3&3( %"#%( %"&( '&;.&2%0'( #--&>B.?( $'02&34'&( /-( $&';0'>&3( B?( #,( /,-%#..#%/0,(2'&I(%'#/,&3(#,3(#$$'0G&3(B?(C/#6#%F(+,2@(
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CAUTION
NOTE
NOTE
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2.12.1 Installation of Trusses and Intercostals
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CAUTION
When assembling the reflector on the ground, the trusses should be installed by alternating from one side of the reflector to the other. This will prevent an unbalanced load that could cause the assembly to tip over.
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NOTE
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%I0(B0.%-(O/%&>()`RF(;04'(I#-"&'-(O/%&>(8bRF(#,3(%I0(,4%-(O/%&>()hR@(
7c@( E%%#2"( ,&T%(2.02<I/-&(-%'4%(#,3( %'4--( #--&>B./&-( #-(3&-2'/B&3(/,(-%&$-(8(
#,3( 5@( ( :"&,( /,-%#..( /,%&'20-%#.-( #,3( '/="%( "#,3( -$#'( %'4--( B'#2&( #-( 3&-2'/B&3(/,(-%&$-(7)(%"'04="(7a@(
7`@( E%%#2"( ,&T%( ;04'( 2.02<I/-&( -%'4%( #,3( %'4--( #--&>B./&-( #-( 3&-2'/B&3( /,(
-%&$-( 8( #,3( 5@( ( E;%&'( "( -%'4%( #,3( %'4--( #--&>B.?( /-( /,-%#..&3F( /,-%#..( /,%&'20-%#.-(#-(3&-2'/B&3(/,(-%&$-(a(%"'04="(`@(
7h@( E%%#2"( ,&T%( 2.02<I/-&( -%'4%( #,3( -$#'( %'4--( #--&>B./&-( #-( 3&-2'/B&3( /,(
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)b@( E%%#2"( ,&T%( ;/G&( 2.02<I/-&( -%'4%( #,3( %'4--( #--&>B./&-( #-( 3&-2'/B&3( /,(
-%&$-( 8( #,3( 5@( ( E;%&'( "( -%'4%( #,3( %'4--( #--&>B.?( /-( /,-%#..&3F( /,-%#..( /,%&'20-%#.-(#-(3&-2'/B&3(/,(-%&$-(a(%"'04="(`@(
)7@( E%%#2"( ,&T%( 2.02<I/-&( -%'4%( #,3( -$#'( %'4--( #--&>B./&-( #-( 3&-2'/B&3( /,(
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))@( E%%#2"( ,&T%( ;/G&( 2.02<I/-&( -%'4%( #,3( %'4--( #--&>B./&-( #-( 3&-2'/B&3( /,(
-%&$-( 8( #,3( 5@( ( E;%&'( "( -%'4%( #,3( %'4--( #--&>B.?( /-( /,-%#..&3F( /,-%#..( /,%&'20-%#.-(#-(3&-2'/B&3(/,(-%&$-(a(%"'04="(`@(
)8@( E%%#2"( ,&T%( 2.02<I/-&( -%'4%( #,3( -$#'( %'4--( #--&>B./&-( #-( 3&-2'/B&3( /,(
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)5@( E%%#2"(.#-%(%I0(2.02<I/-&(-%'4%(#,3(%'4--(#--&>B./&-(#-(3&-2'/B&3(/,(-%&$-(
8( #,3( 5@( ( E;%&'( "( -%'4%( #,3( %'4--( #--&>B.?( /-( /,-%#..&3F( /,-%#..( /,%&'20-%#.-(#-(3&-2'/B&3(/,(-%&$-(a(%"'04="(`@(
2.12.2 Installation of the Spars and Subreflector
6%43?( V/=4'&( )*7F(-"&&%( 8(%0( 4,3&'-%#,3("0I( %"&(-4B'&;.&2%0'( #,3( -$#'-(;/%( %0=&%"&'@((1'02&&3(I/%"(%"&(#--&>B.?(#220'3/,=(%0(%"&(;0..0I/,=($'02&34'&-J(
7@( E--&>B.&( ;04'(-$#'-(O/%&>(7aR(%0(%0$(-$#'(;/%%/,=( O/%&>(7MR(I/%"(`(-2'&I-(
O/%&>(`RF(7a(I#-"&'-(O/%&>(hRF(#,3(`(,4%-(O/%&>(7bR@(
)@( E%%#2"( %"&( -4B'&;.&2%0'( -4$$0'%( ;'#>&( O/%&>( aR( %0( %"&( >04,%/,=( ;'#>&(
O/%&>(cR(4-/,=(%"'&&(-2'&I-(O/%&>(`RF(-/T(I#-"&'-(O/%&>(hRF(#,3(%"'&&(,4%-( O/%&>(7bR(/,(%"&(%"'&&(#3e4-%/,=(-.0%-@(
8@( E%%#2"( %"'&&( %"'&3( '03-(O/%&>(7)R(%0(%"&(;'#>&-(O/%&>-(a( #,3(cR(4-/,=(
&/="%(I#-"&'-(O/%&>(hR(#,3(&/="%(,4%-(O/%&>(7bR(0,("('03@(
(
5)678)9( )*7)(
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M@( 6&%( %"&( -4B'&;.&2%0'( O/%&>( MR( 20,2#G&( -/3&( 4$( 0,( #( $#33&3( -4';#2&( ;0'(
$'0%&2%/0,@(
a@( +,-%#..( #(,4%( O/%&>(78R( #,3(#( I#-"&'(O/%&>( 77R(0,%0( "(%"'&3( -%43(
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-#>&(&,3(0;("(-%43(/,%0(0,&(0;(%"&(>#2"/,&3(B0--(0,(%"&(-4B'&;.&2%0'@(
c@( +,-%#..(#(,4%(O/%&>(78R(0,%0("(%"'&3(-%43(O/%&>(75R(#$$'0T/>#%&.?(8(
/,2"&-(ic@a(2>j(;'0>(%"&(;'&&(&,3F(#,3($.#2&(#(I#-"&'(O/%&>( 77R(0G&'(%"&( &,3(0;(%"&(-%43(#,3(0,%0(%"&(,4%@(
`@( [/;%(%"&(-4B'&;.&2%0'(4$(%0(%"&(-4$$0'%(;'#>&(#,3(/,-&'%(%"&(-%43-(/,%0(%"&(
20''&-$0,3/,=( "0.&-( /,( %"&( ;'#>&@( 6&24'&( %"&( -4B'&;.&2%0'( 4-/,=( %"'&&( I#-"&'-(O/%&>(77R(#,3(%"'&&(,4%-(O/%&>(78R@(
h@( !"0<&(#(,?.0,(-%'#$(#'04,3(%"&(-$#'(#--&>B.?(%0$(;/%%/,=(#,3(#%%#2"(/%(%0(
%"&(./;%/,=("00<(0;(%"&(2'#,&@(
7b@( Q0/-%( %"&( -$#'( #,3( -4B'&;.&2%0'(#--&>B.?(/,%0(%"&('&;.&2%0'(#,3(#./=,(%"&(
.0I&'(&,3(0;("(-$#'(I/%"(%"&(#%%#2">&,%(%#B(0,(#(-$#'(%'4--@(E%%#2"(%"&(
-$#'-(%0(%"&(%'4--(%#B-(#-(-"0I,(/,(V/=4'&()*7F(-"&&%()F(4-/,=(;04'(-2'&I-( O/%&>()MRF(&/="%(I#-"&'-(O/%&>()cRF(#,3(;04'(,4%-(O/%&>()aR@(
77@( :0'D4&(#..(%"&(;#-%&,&'-(4-&3(/,(%"&(#--&>B.?(#,3(/,-%#..#%/0,(0;(%"&(-$#'-(
#,3( -4B'&;.&2%0'( %0( %"&( G#.4&-( 20''&-$0,3/,=( %0( %"&( 20''&2%( -/Y&-( #-( /,3/2#%&3(/,(:#B.&()*)@(
2.12.3 Truss Alignment
7@( +,-%#..( %"&(%"&030./%&( >04,%/,=(B'#2<&%(0,%0( %"&( $#,&.( >04,%/,=( '/,=( /,(
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)@( +,-%#..( %"&( %"&030./%&( 0,%0( %"&( >04,%/,=( B'#2<&%@( [&G&.( %"&( %"&030./%&(
0G&'( /%-( %"'&&( ;&&%( 4-/,=( #,( 7`*/,2"( >#2"/,&( -2#.&F( >&#-4'/,=( 7a@`Mb( /,2"&-(i5)@chh(2>j(4$(;'0>(%"&($#,&.(>04,%/,=('/,=@(O6&&(V/=4'&()*5@R(
8@( k&'0(%"&(#Y/>4%"(-2#.&(0;(%"&(%"&030./%&(I"/.&(.00</,=(#%(%"&(2&,%&'(0;(%"&(
>04,%/,=(B0.%(0;(%"&(;/'-%(%'4--(%0(%"&("4B@(
5@( 6&%( ( %"&( %"&030./%&( &.&G#%/0,( #,=.&( %0( cMl*57U*M8P@( V024-( 0,( %"&( 7Z5P(
3/#>&%&'( =#=&( "0.&(/,( %"&( %0$( 0;(%"&( &,3($.#%&( 0,(%"&( %'4--@(E3e4-%( %"&( %'4--( .#%&'#..?( #,3( G&'%/2#..?( -0( %"#%( %"&( =#=&( "0.&( /-( 2&,%&'&3( 0,( %"&( %"&030./%&(%&.&-20$&(2'0--"#/'-@(:/="%&,(%"&(>04,%/,=(-2'&I-(;0'(%"&(%'4--( #%(%"&("4BF(#,3(%"&( -2'&I-(I"/2"(#%%#2"(%"&(04%&'(3/#=0,#.(B'#2&-(%0(%"&( %'4--@((
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