COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 132
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
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
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