DOCUMENT NUMBER 250-16-1
SEALED
2011.08.16
16:58:20
-07'00'
250
PASSENGER SPEAKER AMPLIFIER
INSTALLATION AND OPERATION MANUAL
REV "-" Sep 15, 2004
Cobham
6400 Wilkinson Drive
Prescott, AZ 86301-6164
(928) 708-1500
Amendment #3 Aug 9, 2011
CONFIDENTIAL AND PROPRIETARY TO COBHAM
250-16-1 Rev. - 250 Passenger Speaker Amplifier Installation and Operation Manual
Cobham
has acquired the assets of Nothern Airborne
Technology Ltd. and dB Systems Inc., and
has reissued this manual in its entirety
Cobham
will be responsible for all future
amendments and revisions.
Aug 9, 2011 Page ii
ENG-FORM: 820-0109.DOT Amendment #3 Aug 9, 2011
CONFIDENTIAL AND PROPRIETARY TO COBHAM
250-16-1 Rev. - 250 Passenger Speaker Amplifier Installation and Operation Manual
Amendment
Zack Pahlman
2011.08.16
11:05:03 -07'00'
Geoff
Melton
2011.08.16
14:37:12
-07'00'
Aaron
Voigt
(Approve
d)
2011.08.1
6
16:24:54
-07'00'
Periodically Cobham will release manual amendments. In order to maintain the most
accurate and up to date manual these amendments should be carried out immediately
upon receipt and recorded on the following amendment record.
AMENDMENT RECORD
Amend
ment
Date
Amendment Change Check Approve
Number
1 Sep 15/04
2 Oct 21/04
3 Aug 9/11 Incorporated ECR11040.
Added 250-[ ] MOD C.
Insert any Amendment Instruction sheets after this page.
Aug 9, 2011 Page iii
ENG-FORM: 820-0109.DOT Amendment #3 Aug 9, 2011
CONFIDENTIAL AND PROPRIETARY TO COBHAM
INSTALL_OPS
MANUAL AMENDMENT
Manual: 250-16-1 Amendment #: 3
Document #: 250-16-1 809-0003 Amendment Date: Aug 8, 2011
The purpose of this amendment is to update the 250 outline drawing and MOD table
per ECR11040.
Amendment Instructions:
1
2
Note: Ensure that all drawings are inserted in the order shown on the latest drawing lists.
Remove Pages Replace With Pages
Title Page Amendment # 2 Title Page Amendment # 3
Page ii Amendment # 2 Page ii Amendment # 3
Page iii Amendment # 2 Page iii Amendment # 3
Page b Amendment #2 Page b Amendment #3
Page c Amendment #1 Page c Amendment #3
Page d Amendment #2 Page d Amendment #3
Remove Drawings Replace With Drawings
250 Rev 1.71 (page 7) 250 Rev 1.90 (page 7)
2 Update the Amendment Record sheet at the front of the manual.
3 Insert this page into the manual after the Amendment Record sheet (page iii).
Manual Amendment ends after the following amended pages
Amendment #3 Aug 9, 2011 Page 1
ENG-FORM: 809-0108.DOT
PROPRIETARY AND CONFIDENTIAL TO COBHAM
INSTALL_OPS
MANUAL AMENDMENT
Manual: 250-16-1 Amendment #: 2
Document #: Install_Ops\250\809-0002 Amendment Date: Oct 21, 2004
The purpose of this amendment is to update the 250 outline drawing.
Amendment Instructions:
1
Page b Amendment #1 Page b Amendment #2
Page d Amendment #1 Page d Amendment #2
Page 7 Amendment#1 Page 7 Amendment #2
Note: Ensure that all drawings are inserted in the order shown on the latest drawing lists.
2 Update the Amendment Record sheet at the front of the manual.
3 Insert this page into the manual after the Amendment Record sheet (page iii).
Manual Amendment ends after the following amended pages
Remove Pages Replace With Pages
Title Page Amendment #1 Title Page Amendment #2
Amendment #2 Oct 21, 2004 Page 1
ENG-FORM: 809-0108.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
INSTALL_OPS
MANUAL AMENDMENT
Manual: SM250 250 Amendment #: 1
Document # SM250\Install_Ops\809-0001 Amendment Date: Sep 15, 2004
The purpose of this amendment is to update all applicable drawings.
Amendment Instructions:
1
Pages b – c Pages b – d Amendment #1
Page 7 Page 7 Amendment #1
2
3 Update the Amendment Record sheet at the front of the manual.
4 Insert this page into the manual after the Amendment Record sheet (page iii).
Manual Amendment ends after the following amended pages
Remove Pages Replace W ith Pages
250-16-1 Title Page Rev - SM250 Title Page Rev -
Insert Pages After Page
Page ii – iii SM250 Title Page
Amendment #1
ENG-FORM: 809-0108.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Sep 15, 2004 Page 1
EQUIPMENT MANUAL 250-16-1 REV -
CHANGE RECORD
DATE
3-11-03 ORIGINAL DOCUMENT RELEASED
CHANGE
APPROVAL
250/250-16-1
Page a
EQUIPMENT MANUAL 250-16-1 REV -
TABLE OF CONTENTS
Page
1.0 OPERATING INSTRUCTIONS AND EQUIPMENT LIMITATIONS ................................................1
2.0 SPECIFICATIONS ..........................................................................................................................3
3.0 INSTALLATION PROCEDURES, WIRING DIAGRAM, AND LIMITATIONS..................................6
3.1 PHYSICAL.......................................................................................................................................6
3.2 ELECTRICAL ..................................................................................................................................6
Tables
Table A Detail Part Numbers...............................................................................................................c
Table B Figures with Applicable Serial Numbers ................................................................................d
Table 1 Pin Identification.....................................................................................................................9
Table 2 Environmental Qualification Form........................................................................................13
Figures / Drawings
250 Outline, Model 250-[ ], Passenger Speaker Amplifier (Rev 1.90) ........................................7
Figure 2 Model 250-[ ] Block Diagram................................................................................................8
Figure 3 Model 250-[ ] Wiring Diagram ............................................................................................10
Figure 4 Internal Trim Pot Adjustments..............................................................................................13
250/250-16-1 Amendment #3 Aug 9, 2011 Page b
PROPRIETARY AND CONFIDENTIAL TO COBHAM
EQUIPMENT MANUAL 250-16-1 REV -
MODEL 250 DETAIL PART NUMBER DESCRIPTIONS
The detail part numbers associated with the Model 250 Passenger Speaker Amplifier may
define different level adjustments and/or test procedures than those outlined in the
calibration and test table of document No. 250-4, Acceptance Test Procedure. Table A
describes those differences.
NOTE: A Model 250 with an associated detail part number is designated as a Model 250-XXX,
where XXX is the applicable detail part number.
Table A. Detail Part Number Description
Detail Part Number Description of Difference
001 Low Pass Filters adjusted for –3 dB attenuation at 70 Hz on Left
and Right Speaker Outputs. High Pass Filters adjusted for –3 dB
attenuation at 20 Khz on Left and Right Speaker Outputs.
-001 calibration is designed for use with
dB Systems 250-61, 4-inch speakers.
MOD A units use PCB 250-81 to prevent speaker popping on
power up. MOD B units include PCB 250-91 in place of PCB 250-
81. MOD C units include modifying component value of C1 and
C27 to fix high frequency oscillation problem. PCB 250-52
includes the increased stereo gain.
002 The Model 250-002 has no differences from the Base Model.
MOD A units use PCB 250-81 to prevent speaker popping on
power up. MOD B units include PCB 250-91 in place of PCB 250-
81. MOD C units include modifying component value of C1 and
C27 to fix high frequency oscillation problem. PCB 250-52
includes the increased stereo gain.
003 Identical to Base Model with the following changes:
- Stereo Left and Stereo Right inputs are reduced to 0.45 Vrms.
- Stereo Left and Stereo Right input gain is increased so that the
outputs are the same as the Base Model.
MOD A units use PCB 250-81 to prevent speaker popping on
power up. MOD B units include PCB 250-91 in place of PCB 250-
81. MOD C units include modifying component value of C1 and
C27 to fix high frequency oscillation problem. PCB 250-52
includes the increased stereo gain.
250/250-16-1 Amendment #3 Aug 9, 2011 Page c
PROPRIETARY AND CONFIDENTIAL TO COBHAM
EQUIPMENT MANUAL 250-16-1 REV -
250-16-1 FIGURES
This page lists the drawings necessary for complete maintenance and troubleshooting.
The applicable serial numbers are shown in the right hand column.
Previously only the most current revision of each figure was included in this
manual. For these figures, the rev is listed as "N/A".
Table B. Figures with Applicable Serial Numbers
FIGURE/DWG REV. DESCRIPTION TYPE SERIAL #
250 1.90 Passenger Speaker Amplifier Outline All
2 N/A Passenger Speaker Amplifier Block Diagram All
3 N/A Passenger Speaker Amplifier Wiring Diagram All
4 N/A Passenger Speaker Amplifier Internal Trim Pot Adjustments All
250/250-16-1 Amendment #3 Aug 9, 2011 Page d
PROPRIETARY AND CONFIDENTIAL TO COBHAM
EQUIPMENT MANUAL 250-16-1
EQUIPMENT MANUAL
MODEL 250-[ ]
1.0 OPERATING INSTRUCTIONS AND EQUIPMENT LIMITATIONS
The Model 250 Passenger Speaker Amplifier is a r emotely controlled, electronic unit that operates
upon command from switches and potentiometers in the cockpit or cabin of the aircraft. The
Model 250 provides Seat Belt and No Smoking sign chime tones, a Cabin Call ringer tone, ADF,
Pilot Select Comm., TV, Briefer and Cabin Pag ing audio, all in mono, to the cabin speakers. It
also provides audio taken from an external AM/FM stereo receiver/cassett e tape or CD player, in
stereo, to the cabin speakers.
Both left and rig ht speaker amplif ier channels are each powered through separate int ernal fuses,
so that a failure in one speaker channel will not disable the other speaker channel or the
remaining control circuitry.
All inputs and operating modes are electronically switched. Ground sig nals, supplied by manual
switches in the cockpit, enable the electr onic switches in the Model 250. The circuit ry is arrang ed
to give Paging and Brief audio priority; the PA MIC or Brief switch signals essentially open the
Stereo Left, Stereo Right, ADF 1, ADF 2, Pilot Select COMM, and TV audio inputs. Microphone
bias current is available from the Model 250 for the PA MIC microphone input.
Electronic attenuators are employed to control paging volume and master receiver (ADF 1, ADF 2,
PSC, and TV) volume. The attenuators each have approximately 30 dB (m in.) of range and are
each controlled by a remot e volume potentiometer. The pots r equired are zero to 10,000 ohm,
linear taper and are electrically arranged to pr ovide maximum resistance for maximum volume.
The audio source (stereo t ape cassette player, etc.) for the Stereo Lef t and Right inputs should
have its own volume control attenuator for the Stereo Input to Speaker Output audio channel.
A musical chime tone is provided to the cabin speakers to alert the passengers of a change in the
Fasten Seat Belt or No Smoking sign status. A Cabin Call ringer tone is also provided to the
cabin speakers for a cockpit to cabin intercom system. T he chime and ringer tones do not pass
through either of the electronic attenuators. Inter nal screwdriver potentiometer adjustments are
accessible, after r e m oval of the Model 250 end plate, to set the chime or ringer levels heard in the
passenger speakers.
The Left and Right Speaker Amplifier output ratings are each 28 watts into 2 ohms (30 W atts
typical). Both speaker amplif ier outputs ar e inter nally protected ag ainst open and short cir cuits as
well as over-temperature (>105°C).
250/250-16-1
Page 1
EQUIPMENT MANUAL 250-16-1
The operating m odes of the Model 250 are established when either a gr ound (low) signal or a 12
to 32 VDC (high) signals applied as listed below to the connector pin listed:
Pin No.
Signal
Control Identification Function
P50-16 Low ADF 1 Switch Connects ADF 1 input
audio to Left and Right
Speaker outputs.
P50-15 Low ADF 2 Switch Connects ADF 2 input
audio to Left and Right
Speaker outputs.
P50-14 Low PSC Switch Connects Pilot Select
COMM input audio to Left
and Right Speaker
outputs.
P50-13 Low TV Swith Connects TV input audio
to Left and Right
Speaker outputs.
P50-5 Low Stereo Switch Connects Stereo Left and
Stereo Right input audio
to Left and Right
Speaker outputs, respectively.
P50-24 Low PA Key Connects PA MIC input
audio to PA Sidetone and
Left and Right Speaker
outputs. Opens ADF,
PSC, TV, and Stereo input
audio circuits.
P50-25 Low Briefer Switch Connects Briefer input
audio to PA Sidetone and
Right Speaker outputs.
Opens ADF, PSC, TV and
Stereo input audio circuits.
P50-31 High No Smoking Chime tone to Left and
Right stereo outputs.
P50-32 High Seat Belt Chime tone to Left and
Right stereo outputs.
P50-33 Low Cabin Call Ringer tone to Left and
Right stereo outputs.
P50-34 Low Hook Switch Disables ringer tone.
*An application or
removal of a high signal at pins P50- 31 and P50- 32 will provide a chime tone at
Left and Right Speaker outputs.
NOTE: P50-XX is a pin on the 37 pin connector, P50-1.
P40-XX is a pin on the 25 pin connector, P40-1.
250/250-16-1
Page 2
EQUIPMENT MANUAL 250-16-1
All internal screwdriver potentiomet er adjustments of the Model 250 are set to factory standards.
If it is necessary to change a setting, refer to the calibration and maintenance section of this
manual.
The amplifiers are adjusted for acceptable listening output levels into the proper loads with ADF
receiver inputs of 7.75 V
and PSC, TV, Stereo and Brief audio input s of 1.00 V
RMS
. With the
RMS
volume controls set to maximum volume position, t hese inputs will provide 7.8 VRMS (28 watts)
into 2 ohms at each speaker output. T he receiver input levels are realized when receivers are set
for 100 milliwatts into 600 ohm s. If these levels are great ly exceeded at the inputs, the audio will
become distorted due to peak clipping and audio bleedthrough will be noticed. The amplifiers,
however, will not be damaged.
2.0 SPECIFICATIONS
Input specifications are expressed in volts RMS, rather than milliwatts, to avoid any
misunderstanding.
INPUTS
:
ADF: Two single, switched audio inputs for ADF, etc. Input level is 7.75 V
RMS
.
PSC: One single, switched audio input compatible with the Pilot Select COMM
output of dB Systems cockpit audio control amplifiers such as Model 438
and 700 which provides a 1.00 V
signal produced from a summat ion of
RMS
selected COMM, DME, and MKR receivers.
TV: One single, switched audio input for TV, etc. Input level is 1.00 V
RMS
.
STEREO LEFT: One single, switched differential audio input f or the left channel of stereo
audio from an AM/FM stereo receiver/tape or CD deck, etc. Input level is
maximum 1.00 V
(at maximum source volume) and audio LO is not
RMS
common to that of other inputs.
STEREO RIGHT: Same as Stereo Left, switched by the same control input as Stereo Left.
BRIEF: One single, switched audio input for briefer audio, etc. Input level is
1.00 V
RMS
.
PA MIC: The microphone input, used for cabin paging audio, supplies bias current
and is compatible with carbon and amplified dynamic microphones.
PAGING VOLUME: Controls level of PA MIC and Brief audio inputs to the PA Sidetone and Left
and Right Speaker outputs. Volume control range is 30 dB (minimum)
controlled by a 10,000 ohm, 1/2 Watt, linear pot. Maximum volume is with
maximum resistance.
250/250-16-1
Page 3
EQUIPMENT MANUAL 250-16-1
RECEIVER
VOLUME: Controls level of ADF, PSC and TV audio inputs to the Left and Right
Speaker outputs. Range and control same as Paging Volume
specification.
OUTPUTS
:
RIGHT SPEAKER: The Right Speaker Amplifier is designed for speech and music signals.
Rated Power spec. is the maximum power the amplifier can continuously
deliver into the maximum rated load without clipping.
Load
Rated Power Load
1 ohm 49 W 1 ohms (40 Watts typical)
2 ohm 28 W 2 ohms (30 Watts typical)
4 ohm 15 W 4 ohms (18 Watts typical)
LEFT SPEAKER: Same as Right Speaker specification
PA SDTN: This output will deliver 6.7 milliwatts into 600 ohm s, continuously. Rated
and continuous power ratings are the same.
CHIME TONE: Generated and supplied to left and right speaker outputs when 12 to 32
VDC is applied to and removed fr om connector pins P50- 31 or P50-32. A
20 Hz tone. Factory set for 3.5 VP-P into 2 ohm s, is adjustable from
790 +
1.0 to VP-P.
RINGER TONE: Generated and supplied to lef t and right speaker outputs when a ground
signal is applied to connector pin P50-33. Ringer t one is 700 +
ON for 1.8 +
0.1 second, then OFF for 3. 2 +0.1 second, repeating, and is
75 Hz tone,
factory set for 1.5 VP-P (700 Hz component) into 2 ohms, adjust able from
0 to 5.2 VP-P.
FREQUENCY
RESPONSE: Upper and lower freq uency limits are adjustable. Stereo, ADF, TV, PSC
inputs to speaker outputs are f lat within 3 dB from 25 Hz to 20,000 Hz. All
other inputs to speaker or PA sidetone out put s are f lat within 3 dB from 350
Hz to 6,000 Hz.
HARMONIC
DISTORTION
(THD+N): Less than 0.25 percent distortion, for st ereo and less than 1% for ADF, TV
and PSC to all outputs (25 Hz to 20 Khz). Less than 3% for PA and brief er
to all outputs (350 Hz to 6 Khz).
250/250-16-1
Page 4
EQUIPMENT MANUAL 250-16-1
ISOLATION BETWEEN CHAN N ELS: 60 dB, Mi n i mu m.
OUTPUT NOISE: Greater than 75 dB below rated, all outputs.
POWER SUPPLY: 28 VDC, 5 ampere maximum.
OPERATING TEMPERATURE: From -55 to +70°C. Thermal fold back of the speaker
outputs occurs if the heatsink temperature reaches 105°C.
OPERATING ALTITUDE: To 70,000 feet.
QUALIFIED TO: FAR PART 2 1 , TS O-C50c
[A2F2]-BA(CL)XXXXXXZ(BZ)AAATZ(XXC2)XX
RTCA DO-160C: Refer to Table 7, Environmental
Qualification Form, for test category information.
250/250-16-1
Page 5
EQUIPMENT MANUAL 250-16-1
3.0 INSTALLATION PROC E DURES, WIRING D IAGRAMS, A N D LIMITATIONS
3.1 PHYSICAL
Installation dimensions are shown on the Model 250 outline on Figure 1. The amplifier may be
mounted to a metal or plast ic surface, but it is necessar y to ground the case to the metal air craft
structure. W hen m ounting to a plastic surf ace, use a grounding strap. The case is finished with
an electrically conductive film so it is not necessary to remove the film for electrical bonding.
The Model 250 may be mounted in any position. No shock or vibration isolators are required.
3.2 ELECTRICAL
Connections to the Model 250 are made through two "D" subminiature connectors. The mating
connectors are manufactured by Positronics Industries, Inc. and have part numbers for the
complete connector assemblies, which are:
Connector
Positronics Part No .
P40 (25-pin) SD25F1OJVLO
P50 (37-pin) SD37F1OJVLO
Numerical pin identification is shown on Table 1. The wiring diagram is shown on Figure 2.
Shielded wire must be used where indicated on the diagrams. AW G 24-26 size wire should be
used for all connections except those to the input power, power ground, and speaker amplifier
outputs where AWG 20 (min.) size should be used.
The control switches shown will switch low current loads and should have a DC rating of 28 VDC.
Typical switches for this application include Alco MTA series.
250/250-16-1
Page 6
Amendment #3 Page 7
EQUIPMENT MANUAL 250-16-1
Figure 2. Block Diagram, Model 250-XXX
Passenger Speaker Amplifier
250/250-16-1
Page 8
EQUIPMENT MANUAL 250-16-1
The paging and receiver volume control pots required are linear taper, zero to 10,000 ohms, 1/2
watt or greater. Electrically, the pots are wired to provide maximum resistance to the Model 250
for full volume (fully clockwise rotation).
Table 1. Pin Identification
P40 (25-pin connector):
1 Left Speaker Out HI
2 Left Speaker Out HI
3 Left Speaker Out LO
4 Left Speaker Out LO
5 Left Speaker Out LO
6 28 VDC
7 28 VDC
8 28 VDC
9 Right Speaker Out LO
10 Right Speaker Out LO
11 Right Speaker Out LO
12 Right Speaker Out HI
13 Right Speaker Out HI
P50 (37-pin connector):
1 Audio Common (except stereo)
2 PA MIC Hi
3 Paging Volume
4 Briefer Audio Hi
5 Stereo Switch
6 Left Input HI
7 Left Input LO
8 Right Input LO
9 Right Input HI
10 No Connection
11 Receiver Volume Control
12 No Connection
13 TV Switch
14 PSC Switch
15 ADF 2 Switch
16 ADF 1 Switch
17 ADF 1 Audio HI
18 TV Audio HI
19 PSC Audio HI
14 Left Speaker Out HI
15 No Connection
16 No Connection
17 Power Ground
18 Power Ground
19 Power Ground
20 Power Ground
21 28 VDC
22 Chassis Ground
23 No Connection
24 No Connection
25 Right Speaker Out Hi
20 Audio Common (except stereo)
21 Audio Common (except stereo)
22 Audio Common (except stereo)
23 No connection
24 PA Key
25 Briefer Switch
26 No Connection
27 Audio Common (except stereo)
28 Audio Common (except stereo)
29 No Connection
30 No Connection
31 Smoking Sign Switch
32 Seat Belt Sign Switch
33 Cabin Call Switch
34 Hook Switch
35 PA Sidetone HI
36 Audio Common (except stereo)
37 ADF 2 Audio HI
250/250-16-1
Page 9
EQUIPMENT MANUAL 250-16-1
250/250-16-1
Figure 3. Wiring Diagram
Page 10
EQUIPMENT MANUAL 250-16-1
250/250-16-1
Figure 3. Wiring Diagram
(continued)
Page 11
EQUIPMENT MANUAL 250-16-1
250/250-16-1
Figure 3. Wiring Diagram
(continued)
Page 12
EQUIPMENT MANUAL 250-16-1
250/250-16-1
Figure 4. Internal Trim
Pot Adjustments
Page 13
EQUIPMENT MANUAL 250-16-1
Table 2. Environme n ta l Qu a lific a tio n F o rm
NOMENCLATURE: Passenger Speaker Amplifier
TYPE/MODEL/PART NO.: Model 250-[ ]
MANUFACTURER'S SPECIFIC ATION AND/OR OTHER APPLICABLE SPECIFICAT ION: dB Systems
Document No. 250-16-1, Equipment Manual
MANUFACTURER: dB Systems, Inc.
ADDRESS: 2847 152nd Ave. N.E., Redmond, WA 98052
TSO NUMBER: TSO-C50c
Conditions
DO-160C
Section/
Description of Conducted Tests
Paragraph
Temperature and altitude
Low temperature
High temperature
In-flight loss of cooling
Altitude
Decompression
Overpressure
4.0
4.5.1
4.5.2
4.5.3
4.5.4
4.6.1
4.6.2
4.6.3
Equipment tested to C a te go ry F2.
(see also temperature variation)
(see also temperature variation)
(see also temperature variation)
Equipment does not require special cooling.
Equipment tested at +70,000 feet.
Equipment tested to Category A2, except
decompressed to +55,000 feet.
Equipment tested to C a te go ry A2.
Temperature variation 5.0 Equipment tested to Category B; combined
with 4.5.1, 4.5.2, & 4.5.3.
Humidity 6.0 Equipment tested to category A requirements.
Operational shocks and
Crash safety
Operational shocks
Crash safety
7.0
7.2
7.3
Equipment tested without shock mounts per
DO-160C, paragraphs 7.2.1, 7.3.1, 7.3.2, &
7.3.2.2.
Vibration 8.0 Equipment tested without shock mounts to
Category L, except extended curve 150-2,000
Hz 3g pk. Equipment tested without shock
mounts to Category C. No change in critical
frequencies during tests.
Explosion proofness 9.0 Equipment identified as Category X, no test
required.
Waterproofness 10.0 Equipment identified as Category X, no test
required.
Fluids susceptibility 11.0 Equipment identified as Category X, no test
required.
250/250-16-1
Page 14
Table 2. Environmental Qualificatio n F o rm (continued)
TYPE/MODEL/PART NO.: Model 250-[ ]
EQUIPMENT MANUAL 250-16-1
CONDITIONS
DO-160C
SECTION/
DESCRIPTION OF CONDUCTED TESTS
PARA GRA PH
Sand and dust 12.0 Equipment identified as Category X, no test
required.
Fungus resistance 13.0 Equipment identified as Category X, no test
required.
Salt spray 14.0 Equipment identified as Category X, no test
required.
Magnetic effect 15.0 Equipment is Class Z.
Power input 16.0 Equipment tested to Categories B and Z.
Voltage spike 17.0 Equipment tested to Category A.
Audio frequency conducted
18.0 Equipment tested to Category A.
susceptibility
Induced signal susceptibility 19.0 Equipment tested to Category A.
Radio frequency susceptibility 20.0 Equipment tested to Category T.
Emission of radio frequency energy
Lightning induced transient
21.0 Equipment tested to Category Z.
22.0 Equipment tested to Category XXC2.
susceptibility
Lightning direct effects 23.0 Equipment identified as Category X, no test
required.
Icing 24.0 Equipment identified as Category X, no test
required.
Other Tests: Acceptance tests in accordance with dB Systems’ Acceptance Test Procedures 250-4
and performance tests in accordance with RTCA Document DO-214, Section 2.8 were conducted on
the Model 250 qualification test unit during and/or after each environmental test, as appropriate.
Remarks:
• Tests of DO-160C, Sections 4.0 (paragraphs 4.5.1, 4.5.2, and 4.5.3), 5.0, 16.0, and 18.0 were
conducted at dB Systems, Inc. in Redmond, Washington.
• Tests of DO-160C, Sections 4.0 (paragraphs 4.6.2 and 4.6.3) and 20.0 (radiated susc.), were
conducted at Sundstrand Data Control, Inc. in Redmond, Washington.
• Tests of DO-160C, Sections 4.0 (paragraph 4.6.1), 7.0, 8.0, 15.0, 17.0,19.0, 20.0 (conducted
susc.), 21.0, and 22.0 were conducted at Eldec Corporation in Lynnwood, Washington.
250/250-16-1
Page 15
Loading...