COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 136
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
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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