COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 134
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
31
Shunt Dis-
crete
Data Link Fault
The signal path
is shorted
Incorrect Fault Status
indicates a fault
The Data Link Fault sig-
nal always indicates no
fault
32
Differential
Audio (
)
)
Channel 1 Audio Input
3rd Crew or Extra
(High)
The signal path
is open
Degraded Audio
Channel 1 High Sig-
nal
Fails to record
−
no audio
is recorded
32
Differential
Audio (
)
)
Channel 1 Audio Input
3rd Crew or Extra
(High)
The signal path
is shorted
Degraded Audio
Channel 1 High Sig-
nal
Fails to record
−
no audio
is recorded
33
Differential
ARINC429
B
Data Link Input (B)
The signal path
is open
Data disrupted/cor-
rupted
−
Loss of abil-
ity to acquire Data
Link [Input (B)]
Unable to store ARINC
429 (B) Data Link signal
data into the CSMU
33
Differential
ARINC429
B
Data Link Input (B)
The signal path
is shorted
Data disrupted/cor-
rupted
−
Loss of abil-
ity to acquire Data
Link [Input (B)]
Unable to store ARINC
429 (B) Data Link signal
data into the CSMU
34
Differential
ARINC429
A
Data Link Input (A)
The signal path
is open
Data disrupted/cor-
rupted
−
Loss of abil-
ity to acquire Data
Link [Input (A)]
Unable to store ARINC
429 (A) Data Link signal
data into the CSMU
34
Differential
ARINC429
A
Data Link Input (A)
The signal path
is shorted
Data disrupted/cor-
rupted
−
Loss of abil-
ity to acquire Data
Link [Input (A)]
Unable to store ARINC
429 (A) Data Link signal
data into the CSMU
35
Differential
Audio (
−
)
Channel 2 Audio Input
Copilot (Low)
The signal path
is open
Degraded Audio
Channel 2 Low Sig-
nal
Fails to record
−
no audio
is recorded
35
Differential
Audio (
−
)
Channel 2 Audio Input
Copilot (Low)
The signal path
is shorted
Degraded Audio
Channel 2 Low Sig-
nal
Fails to record
−
no audio
is recorded
36
Discrete
FDR Status
The signal path
is open
Incorrect FDR Fault
Status
−
The FDR al-
ways indicates a fault
The FDR Status Signal
always indicates a fault
36
Discrete
FDR Status
The signal path
is shorted
Incorrect FDR Fault
Status
−
The FDR al-
ways indicates no
fault
The FDR Status Signal
always indicates no fault
37
Differential
Audio (
)
)
Channel 2 Audio Input
Copilot (High)
The signal path
is open
Degraded Audio
Channel 2 High Sig-
nal
Fails to record
−
no audio
is recorded
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