COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 136
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
44
Discrete
CVR Replay Inhibit
FDR Inhibit
The signal path
is shorted
FDR/CVR
−
Stops
the FDR function
CVR (only)
−
Unable
to inhibit audio replay
or read
−
out
FDR/CVR
−
Stops the
FDR function
CVR (only)
−
Unable to inhibit audio re-
play or read
−
out
45
Differential
Audio (
−
)
Channel 4 Audio Input
Area Microphone
(Low)
The signal path
is open
Degraded Audio
Channel 4 Low Sig-
nal
Fails to record
−
no audio
is recorded
45
Differential
Audio (
−
)
Channel 4 Audio Input
Area Microphone
(Low)
The signal path
is shorted
Degraded EMI and
Audio Interference
Fails to record
−
no audio
is recorded
46
Discrete
FDR Maintenance
The signal path
is open
The FDR Mainten-
ance signal always
indicates no mainten-
ance NOTE:
Depends upon cus-
tomer wiring
The FDR Maintenance
signal always indicates
no maintenance
46
Discrete
FDR Maintenance
The signal path
is shorted
The FDR Mainten-
ance signal always
indicates mainten-
ance
NOTE: Depends
upon customer wiring
The FDR Maintenance
signal always indicates
maintenance
47
Differential
Audio (
)
)
Channel 4 Audio Input
Area Microphone
(High)
The signal path
is open
Degraded Audio
Channel 4 High Sig-
nal
Fails to record
−
no voice
is recorded
47
Differential
Audio (
)
)
Channel 4 Audio Input
Area Microphone
(High)
The signal path
is shorted
Degraded Audio
Channel 4 High Sig-
nal
Fails to record
−
no voice
is recorded
48
Differential
Analog (
−
)
Rotor Speed Input Lo
The signal path
is open
Rotor Speed In (Lo)
signal data is disrup-
ted
Unable to record Rotor
Speed
48
Differential
Analog (
−
)
Rotor Speed Input Lo
The signal path
is shorted
Rotor Speed In Lo
Signal is disrupted
Unable to record Rotor
Speed
49
Differential
Analog (
)
)
Rotor Speed Input Hi
The signal path
is open
Rotor Speed In (Hi)
signal data is disrup-
ted
Unable to record Rotor
Speed
49
Differential
Analog (
)
)
Rotor Speed Input Hi
The signal path
is shorted
Rotor Speed In (Hi)
signal data is disrup-
ted
Unable to record Rotor
Speed
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