COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 132
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
18 RS422 Dif-
ferential
FDR Data Output (A) The signal path
is open
Disrupted FDR data
echoed back to
FDAU
Disrupted FDR data
echoed back to FDAU
18 RS422 Dif-
ferential
FDR Data Output (A) The signal path
is shorted
Disrupted FDR data
echoed back to
FDAU
Disrupted FDR data
echoed back to FDAU
19 RS422 Dif-
ferential
FDR Data Output (B) The signal path
is open
Disrupted FDR data
echoed back to
FDAU
Disrupted FDR data
echoed back to FDAU
19 RS422 Dif-
ferential
FDR Data Output (B) The signal path
is shorted
Disrupted FDR data
echoed back to
FDAU
Disrupted FDR data
echoed back to FDAU
20 Discrete I/P Internal Pre Amp At-
tenuator (N6DB)
The signal path
is open
No Effect No Effect
20 Discrete I/P Internal Pre Amp At-
tenuator (N6DB)
The signal path
is shorted
Internal Pre Amp At-
tenuator (N6DB) sig-
nal software receives
continuous 6 dB at-
tenuation
Internal Pre Amp Attenu-
ator (N6DB) signal soft-
ware receives continuous
6 dB attenuation
21 Discrete I/P Internal Pre Amp At-
tenuator (N12DB)
The signal path
is open
No Effect No Effect
21 Discrete I/P Internal Pre Amp At-
tenuator (N12DB)
The signal path
is shorted
Internal Pre Amp At-
tenuator (N12DB)
signal software re-
ceives continuous 12
dB attenuation
Internal Pre Amp Attenu-
ator (N12DB) signal soft-
ware receives continuous
12 dB attenuation
22 Discrete I/P Internal Pre Amp At-
tenuator (N24DB)
The signal path
is open
No Effect No Effect
22 Discrete I/P Internal Pre Amp At-
tenuator (N24DB)
The signal path
is shorted
Internal Pre Amp At-
tenuator (N24DB)
signal software re-
ceives continuous 24
dB attenuation
Internal Pre Amp Attenu-
ator (N24DB) signal soft-
ware receives continuous
24 dB attenuation
23 Discrete
O/P
CVR Fault The signal path
is open
Incorrect CVR Fault
Status appears good
Pilot(s) mistakenly be-
lieves there is no CVR
Fault
23 Discrete
O/P
CVR Fault The signal path
is shorted
The CVR Fault Out-
put Signal erro-
neously appears as
a fault
Pilot(s) mistakenly be-
lieves there is a CVR
Fault
24 Shunt Dis-
crete
FDR Fault The signal path
is open
Incorrect FDR Fault
Status appears good
Pilot(s) mistakenly be-
lieves there is no FDR
Fault
The document reference is online, please check the correspondence between the online documentation and the printed version.
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