COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Page 31
Nov. 01/98
Description and Operation
23–70–04
B. Aircraft Interface (AI) PWA
The Aircraft Interface (AI) PWA mounts within the rear of the Cockpit Voice Recorder
chassis and provides the interface between the aircraft and the Cockpit Voice Re-
corder’s Audio Compressor (AC) and Acquisition Processor (AP) functions. The Air-
craft Interface PWA also includes the storage power supply and provides RF filtering
and lightning protection for all input and output signals that interface with the aircraft.
Input and output signal conditioning is also provided for some signals.
Table 2. Aircraft Interface (AI) PWA Current Configuration Where Used
Aircraft Interface PWA
P/N
Model Effectivity Notes
205E250305 2100−1010−00
2100−1020−00
2100−1020−02
205E250301 2100−1025−02
2100−1025−12
2100−1025−22
2100−1025−24
2100−1026−02
205E250308 2100−1027−02 Data Link
On−board Maintenance
System (OMS)
205E176311 2100−1010−50
2100−1010−51
2100−1020−50
2100−1020−51
Specifically, the Aircraft Interface RF Barrier function provides RF suppression on all
input and output signals needed to meet the requirements of RTCA/DO-160C Sec-
tions 20 and 21; while it provides for lightning protection on all input and output sig-
nals needed to meet the requirements of RTCA/DO–160C Section 22.
The ARINC 557/757A Aircraft Interface provides input signal conditioning for:
Audio Channel Inputs Rotor Speed
Push-To-Test GMT
Voice Erase *Datal Link
Record *OMS
Stop Recording
* Only for P/N 205E2503−01 and 205E1763−08.
Dec. 09/1
Rev. 13 Page 31
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