L3 FA2100 CVR Component Maintenance Manual With Illustrated Parts List page 108

Notes for Figure 9
1. Recommended minimum wire size is #22; however, wire size #24 is electrically per-
missible except for long-run power leads where #18 wire is recommended (pins 9 &
17) Wire resistance should not exceed 1 ohm for power leads and should not ex-
.
ceed 5 ohms for signal leads. All wiring should be MIL–W–22759 or MIL–C–27500.
2. Single point ground.
3. Jumper in aircraft connector. Without this jumper, the unit will not record or erase
previously recorded information, bulk erase will not activate, and test will indicate
NO-GO.
4. Ground connection to be within 1 foot of pin 17. Shields to be grounded at the re-
corder using short wires. Pin 17 is used as a dc return.
5. Twisted shielded cable. Shields to be grounded at the airframe using short connec-
tions. Tie shields to existing single point GND use for Pin 17. (see Note 4).
6. If the power source has battery back-up, a means for terminating recording after a
crash should be included in the aircraft wiring. Grounding pin 10 terminates record-
ing within 10 minutes.
7. Audio input 3V rms maximum.
8. Wiring shown for fixed attenuation of 18 dB.
9. Per FAA Action Notice A8300.56 dated Jan. 24, 1990, the wiring to Channels 1 and
3 may be transposed; that is, Channel 1 will be Pilot and Channel 3 will be Third
Crew Member or PA System.
10. If the Solid State GACVR replaces an existing tape-based GA100 Cockpit Voice Re-
corder installation, the Test Lamp wire connected to pin 23 in the connector that
mates with the GACVR's J1 connector must be moved to pin 44 with the return con-
nected to pin 16.
11. BITE status output: ground = no fault, open = fault or CVR not installed.
12. The Control Unit & Microphone information can be found in CMM, ATA No.
23−70−05, p/n: 165E1747−00 for ED−56A installations or the FA2100GACVR Instal-
lation & Operation manual, p/n: 165E1848−00.
Use or disclosure of information on this sheet is subject
to the restrictions on the cover page of this document.
The document reference is online, please check the correspondence between the online documentation and the printed version.
AVIATION RECORDERS
COMPONENT MAINTENANCE MANUAL
FA2100CVR
23–70–04
Description and Operation
Rev. 15 Page 31
Apr. 14/16