COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 133
July 21/17
Testing & Fault Isolation
23–70
−
30
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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
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