COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
Model FA5000
Rev. 03 Page 218
Feb. 27/13
FDR Function Testing & Fault Isolation
23–70
−
40
Use or disclosure of information on this sheet is subject to
the restrictions on the cover page of this document.
Table 204. Aircraft Interface Troubleshooting Chart (Continued)
Pin
ID
Signal Type
Signal Function
Failure Mode
Local Effect
End Effect
19
Discrete
FDR Status
The signal path is
open
Incorrect FDR Status
The FDR always indic
ates a fault
The FDR Status signal
always indicates a fault
19
Discrete
FDR Status
The signal path is
shorted
Incorrect FDR Status
The FDR always indic
ates no fault
The FDR Status signal
always indicates no
fault
20
Power/
Ground
Chassis GND
The signal path is
open
Degraded EMI/De
graded Performance
(757A)
Degraded EMI/De
graded Performance
(757A)
Loss of power to the
entire recorder (757)
20
Power/
Ground
Chassis GND
The signal path is
shorted
No Effect (757A)
Degraded EMI/De
graded Performance
(757)
No Effect (757A)
Degraded EMI/De
graded Performance
(757)
21
N/A
Spare
The signal path is
open
No Effect
No Effect
21
N/A
Spare
The signal path is
shorted
No Effect
No Effect
22
N/A
Spare
The signal path is
open
No Effect
No Effect
22
N/A
Spare
The signal path is
shorted
No Effect
No Effect
23
Differential
Audio ()
Channel 3 Low Input
The signal path is
open
Degraded Audio Chan
nel 3 Low Signal
Fails to record no au
dio is recorded
23
Differential
Audio ()
Channel 3 Low Input
The signal path is
shorted
Degraded Audio Chan
nel 3 Low Signal
Fails to record no au
dio is recorded
24
Differential
Audio (+)
Channel 3 High Input
The signal path is
open
Degraded Audio Chan
nel 3 High Signal
Fails to record no au
dio is recorded
24
Differential
Audio (+)
Channel 3 High Input
The signal path is
shorted
Degraded Audio Chan
nel 3 High Signal
Fails to record no au
dio is recorded
25
Differential
Video I/P ()
Video In ()
The signal path is
open
Loss of ability to record
video
Unable to record video
25
Differential
Video I/P ()
Video In ()
The signal path is
shorted
Loss of ability to record
video
Unable to record video
26
Differential
Video I/P (+)
Video In (+)
The signal path is
open
Loss of ability to record
video
Unable to record video
26
Differential
Video I/P (+)
Video In (+)
The signal path is
shorted
Loss of ability to record
video
Unable to record video
27
ARINC 429
O/P ()
ARINC 429 Output
Low
The signal path is
open
Loss of ability to record
ARINC 429 Low signal
data
Unable to record
ARINC 429 Low signal
data
Rev.04 Page 218
Mar. 21/14
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