L3 FA5000 Component Maintenance Manual With Illustrated Parts List page 116

Table 204. Aircraft Interface Troubleshooting Chart (Continued)
Pin Signal Type
ID
34 Differential
ARINC717 (­)
35 Differential
ARINC429 (­)
35 Differential
ARINC429 (­)
36 Differential
ARINC429
(+)
36 Differential
ARINC429
(+)
37 Power
37 Power
38 Differential
Audio (­)
38 Differential
Audio (­)
39 Differential
ARINC429
(+)
39 Differential
ARINC429
(+)
40 Differential
ARINC717
(+)
40 Differential
ARINC717
(+)
41 Differential
ARINC717 (­)
41 Differential
ARINC717 (­)
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AVIATION RECORDERS
COMPONENT MAINTENANCE MANUAL
Model FA5000
Signal Function Failure Mode
FDR Data Output The signal path is
ARINC 717 Low shorted
ATC Digital Input Low The signal path is
open
ATC Digital Input Low The signal path is
shorted
ATC Digital Input The signal path is
High open
ATC Digital Input The signal path is
High shorted
Area Microphone 18V The signal path is
Power open
Area Microphone 18V The signal path is
Power shorted
Area Microphone Sig­ The signal path is
nal Low open
Area Microphone Sig­ The signal path is
nal Low shorted
Area Microphone Sig­ The signal path is
nal High open
Area Microphone Sig­ The signal path is
nal High shorted
ARINC 429 Input The signal path is
High open
ARINC 429 Input The signal path is
High shorted
FDR Data Input The signal path is
ARINC 717 High open
FDR Data Input The signal path is
ARINC 717 High shorted
Local Effect
Disrupted FDR Data
Output (ARINC 717
Low) echoed back to
FDAU
Data disrupted/corrup­
ted ­ Loss of ability to
acquire ATC Digital In­
put Low
Data disrupted/corrup­
ted ­ Loss of ability to
acquire ATC Digital In­
put Low
Data disrupted/corrup­
ted ­ Loss of ability to
acquire ATC Digital In­
put High
Data disrupted/corrup­
ted ­ Loss of ability to
acquire ATC Digital In­
put High
Loss of bias to Area Mi­
crophone
Loss of bias to Area Mi­
crophone
Loss of bias to Area Mi­
crophone
Loss of bias to Area Mi­
crophone
Audio from the Area
Mic Signal Low is dis­
rupted
Audio from the Area
Mic Signal Low is de­
graded due to interfer­
ence
Loss of ability to record
ARINC 429 Input High
signal data
Loss of ability to record
ARINC 429 Input High
signal data
Loss of ability to ac­
quire coherent FDR
Data Input (ARINC 717
High)
Loss of ability to ac­
quire coherent FDR
Data Input (ARINC 717
High)
23–70−40
FDR Function Testing & Fault Isolation
Rev. 03 Page 220
Rev.04 Page 220
End Effect
Disrupted FDR Data
Output (ARINC 717
Low) echoed back to
FDAU
Unable to store ATC
Digital Input Low signal
data into the CSMU
Unable to store ATC
Digital Input Low signal
data into the CSMU
Unable to store ATC
Digital Input High signal
data into the CSMU
Unable to store ATC
Digital Input High signal
data into the CSMU
Loss of Area Micro­
phone functionality
Loss of Area Micro­
phone functionality
Loss of audio from
Area Microphone
Loss of audio from
Area Microphone
Fails to record ­ no au­
dio is recorded
Degraded EMI
Unable to record
ARINC 429 High signal
data
Unable to record
ARINC 429 High signal
data
Unable to record good
ARINC 717 data input
from the Main Pro­
cessor
Unable to record good
ARINC 717 data input
from the Main Pro­
cessor
Feb. 27/13
Mar. 21/14