COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
Model FA5000
Rev. 03 Page 217
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
10 Audio O/P () Audio Output (Monit
or) Low
The signal path is
open
No audio (voice) is
present
Unable to monitor au
dio
10 Audio O/P () Audio Output (Monit
or) Low
The signal path is
shorted
No audio (voice) is
present
Unable to monitor au
dio
11 Differential
Analog
Erase CVR Input C The signal path is
open
Loss of ability to erase
recorded audio
The recorder does not
erase recorded audio
11 Differential
Analog
Erase CVR Input C The signal path is
shorted
Loss of ability to erase
recorded audio
The recorder does not
erase recorded audio
12 Discrete I/P Cessation of Record
ing
The signal path is
open
The CVR stays in re
cord mode
The CVR stays in re
cord mode
12 Discrete I/P Cessation of Record
ing
The signal path is
shorted
The recorder stops re
cording voice after 10
minutes but keeps
Stops audio recording
function after 10
minutes
13 N/A Spare The signal path is
open
No Effect No Effect
13 N/A Spare The signal path is
shorted
No Effect No Effect
14 N/A Spare The signal path is
open
No Effect No Effect
14 N/A Spare The signal path is
shorted
No Effect No Effect
15 Differential
Audio ()
Channel 2 Low Input The signal path is
open
Degraded Audio Chan
nel 2 Low Signal
Fails to record no au
dio is recorded
15 Differential
Audio ()
Channel 2 Low Input The signal path is
shorted
Degraded Audio Chan
nel 2 Low Signal
Fails to record no au
dio is recorded
16 Differential
Audio (+)
Channel 2 High Input The signal path is
open
Degraded Audio Chan
nel 2 High Signal
Fails to record no au
dio is recorded
16 Differential
Audio (+)
Channel 2 High Input The signal path is
shorted
Degraded Audio Chan
nel 2 High Signal
Fails to record no au
dio is recorded
17 Discrete O/P CVR Maintenance
Fault
The signal path is
open
Incorrect CVR Mainten
ance Fault signal ap
pears good
Pilot(s) mistakenly be
lieves there is no CVR
Fault
17 Discrete O/P CVR Maintenance
Fault
The signal path is
shorted
The CVR Maintenance
Fault signal erro
neously appears as a
fault
Pilot(s) mistakenly be
lieves there is a CVR
Fault
18 Shunt Dis
crete
FDR Maintenance
Fault
The signal path is
open
The FDR Maintenance
Fault signal always in
dicates no mainten
ance NOTE: Depends
upon
The FDR Maintenance
Fault signal always in
dicates no mainten
ance
18 Shunt Dis
crete
FDR Maintenance
Fault
The signal path is
shorted
The FDR Maintenance
Fault signal always in
dicates maintenance
NOTE: Depends upon
The FDR Maintenance
Fault signal always in
dicates maintenance
Rev.04 Page 217
Mar. 21/14
The document reference is online, please check the correspondence between the online documentation and the printed version.
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