COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 133
July 21/17
Testing & Fault Isolation
23–70−30
Use or disclosure of information on this sheet is subject to
the restrictions on the cover page of this document.
Table 103 Aircraft Interface Troubleshooting Chart (Continued)
Pin
ID
Signal Type Signal Function Failure Mode Local Effect End Effect
24 Shunt Dis-
crete
FDR Fault The signal path
is shorted
The FDR Fault Out-
put Signal erro-
neously appears as
a fault
Pilot(s) mistakenly be-
lieves there is a FDR
Fault
25 Differential
ARINC429
(−)
GMT UTC Input 429
(B)
The signal path
is open
GMT (Greenwich
Mean Time) is dis-
rupted
No GMT is recorded
25 Differential
ARINC429
(−)
GMT UTC Input 429
(B)
The signal path
is shorted
GMT (Greenwich
Mean Time) is dis-
rupted
No GMT is recorded
26 Differential
ARINC429
())
GMT UTC Input 429
(A)
The signal path
is open
GMT (Greenwich
Mean Time) is dis-
rupted
No GMT is recorded
26 Differential
ARINC429
())
GMT UTC Input 429
(A)
The signal path
is shorted
GMT (Greenwich
Mean Time) is dis-
rupted
No GMT is recorded
27 RS422 Dif-
ferential
FDR Data Input (B) The signal path
is open
Loss of ability to ac-
quire coherent FDR
data [Input (B)]
FDR records corrupt/
garbled RS422 data
27 RS422 Dif-
ferential
FDR Data Input (B) The signal path
is shorted
Loss of ability to ac-
quire coherent FDR
data [Input (B)]
FDR records corrupt/
garbled RS422 data
28 RS422 Dif-
ferential
FDR Data Input (A) The signal path
is open
Loss of ability to ac-
quire coherent FDR
data [Input (A)]
FDR records corrupt/
garbled RS422 data
28 RS422 Dif-
ferential
FDR Data Input (A) The signal path
is shorted
Loss of ability to ac-
quire coherent FDR
data [Input (A)]
FDR records corrupt/
garbled RS422 data
29 Discrete FDR Data Rate (A) The signal path
is open
Only 64, 128 or 1024
Wps rates available
The Main Processor may
generate an FDR fault
depending upon the rate
29 Discrete FDR Data Rate (A) The signal path
is shorted
Only 256 or 512 Wps
rates available
The Main Processor may
generate an FDR fault
depending upon the rate
30 Differential
Audio (
−)
Channel 1 Audio Input
3rd Crew or Extra
(Low)
The signal path
is open
Degraded Audio
Channel 1 Low Sig-
nal
Fails to record − no audio
is recorded
30 Differential
Audio (−)
Channel 1 Audio Input
3rd Crew or Extra
(Low)
The signal path
is shorted
Degraded Audio
Channel 1 Low Sig-
nal
Fails to record − no audio
is recorded
31 Shunt Dis-
crete
Data Link Fault The signal path
is open
Incorrect Fault Status
indicates no fault
The Data Link Fault sig-
nal always indicates no
fault
The document reference is online, please check the correspondence between the online documentation and the printed version.
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