L3 FA5000, Component Maintenance Manual With Illustrated Parts List

Page: 118 / 202

COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
Model FA5000
Rev. 03 Page 222
Feb. 27/13
FDR Function Testing & Fault Isolation
23–70
−
40
Use or disclosure of information on this sheet is subject to
the restrictions on the cover page of this document.
Table 204. Aircraft Interface Troubleshooting Chart (Continued)
Pin
ID Signal Type Signal Function Failure Mode Local Effect End Effect
50 Discrete I/P ­24dB CAM Input At­
tenuation The signal path is
open No Effect No Effect
50 Discrete I/P ­24dB CAM Input At­
tenuation The signal path is
shorted ­24dB CAM Input At­
tenuation signal soft­
ware receives continu­
ous 24 dB attenuation ­24dB CAM Input At­
tenuation signal soft­
ware receives continu­
ous 24 dB attenuation
51 Differential
Analog (­) Rotor Speed Low The signal path is
open Rotor Speed Low sig­
nal data is disrupted Unable to record Rotor
Speed
51 Differential
Analog (­) Rotor Speed Low The signal path is
shorted Rotor Speed Low sig­
nal data is disrupted Unable to record Rotor
Speed
52 Differential
Analog (+) Rotor Speed High The signal path is
open Rotor Speed High sig­
nal data is disrupted Unable to record Rotor
Speed
52 Differential
Analog (+) Rotor Speed High The signal path is
shorted Rotor Speed High sig­
nal data is disrupted Unable to record Rotor
Speed
53 Power Rtn 28VDC Return
Primary; Connect to
DC Power Supply
Ground The signal path is
open Loss of 28VDC Loss of CVDR function­
ality
53 Power Rtn 28VDC Return
Primary; Connect to
DC Power Supply
Ground The signal path is
shorted No Effect No Effect
54 Ground CAM Input Attenu­
ation Common
Ground The signal path is
open The CAM Input Attenu­
ation (Common
Ground) signal fails to
enable Pins 20, 21 or
22 Degraded functionality
54 Ground CAM Input Attenu­
ation Common
Ground The signal path is
shorted No Effect No Effect
55 Power 28VDC Input Primary The signal path is
open Loss of 28VDC Loss of CVDR function­
ality
55 Power 28VDC Input Primary The signal path is
shorted Loss of 28VDC Loss of CVDR function­
ality
Rev.04 Page 222
Mar. 21/14 The document reference is online, please check the correspondence between the online documentation and the printed version.