L3 FA5000, Component Maintenance Manual With Illustrated Parts List

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COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
Model FA5000
Initital Issue Page 19
Sep. 30/11
Description and Operation
23–70
−
40
Use or disclosure of information on this sheet is subject to
the restrictions on the cover page of this document.
12 CESSATION OF
RECORDING IN Ground logic applied to this pin (or loss of aircraft
power, whichever occurs first) activates a CV/FDR
internal timer that stops the recorder from record­
ing after 10 minutes. Removal of the ground logic
when the recorder is powered will cause the re­
corder to begin recording within 250 ms. Informa­
tion recorded prior to the cessation of recording is
preserved.
ARINC 757­4. Shunt discrete input; ARINC 573
compliant.
GND = STOP ALL RECORDING (WITHIN 10
MIN.)
OPEN = START ALL RECORDING
13 SPARE
14 SPARE
15 CHANNEL 2 INPUT LOW IN Channel 2 audio differential input signal low; 150
Hz to 3.5 kHz bandwidth, 3V RMS maximum. Im­
pedance 5K ohm minimum.
16 CHANNEL 2 INPUT HIGH IN Channel 2 audio differential input signal high; 150
Hz to 3.5 kHz bandwidth, 3V RMS maximum. Im­
pedance 5K ohm minimum.
17 CVR MAINTENANCE
FAULT OUT BITE status output of the voice recording section.
Shunt discrete output at standard ground indicates
correct CVR operational status. Functional and
signal characteristics are ARINC 757 compliant.
Open drain circuit sinks 100 milliamps maximum
with less than 0.5 volts out.
GND = NO CVR FAULT
OPEN = CVR FAULT (BITE status failure, CVR
not installed, or CVR not powered)
18 FDR MAINTENANCE
FAULT OUT BITE status output of the data recording section.
Shunt discrete output at standard ground indicates
correct FDR operational status. Functional and
signal characteristics are ARINC 757 compliant.
Open drain circuit sinks 100 milliamps maximum
with less than 0.5 volts out.
GND = NO FDR FAULT
OPEN = FDR FAULT (BITE status failure, FDR
not installed, or FDR not powered)
19 FDR STATUS OUT Status output of the FDR system. Shunt discrete
OPEN/GND relay output. Standard ground indic­
ates an FDR non­operational status.
GND = FAULT/NO POWER
OPEN = STATUS GOOD
20 CHASSIS GND ­ Chassis ground galvanically isolated from signal
and power returns.
21 SPARE ­ ­
22 SPARE ­ ­
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