L3 FA5000 - Page 114

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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