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PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Audio & Video Monitoring
1. Cockpit Voice Recorder (CVR)
The Fairchild Cockpit Voice Recorder System (CVR) provides a record of four separate voice
inputs. These inputs may be either transmitted or received signals originating from the following
stations: Pilot, Copilot, Public Address or Third Crew Member and Cockpit Area Microphone.
The CVR is a modular system composed of a minimum of two essential modules, the recorder and
the control unit. The recorder, model A100A, is housed in an international orange, 1/2 ATR short
case. It contains the recorder assembly and associated electronics, located in the aft baggage
compartment. The control unit is a standard ARINC characteristic 306 panel format. Model A152B
house microphone pre-amplifier, microphone, test switch, erase switch and meter, located on the
center instrument panel.
The erase feature is a bulk erase function. When activated on the ground, this function will
completely erase all data from the tape. The units normal mode of operation is self erasing while it
is recording.
2. Removal of CVR Unit
The CVR control unit is mounted on the center instrument panel utilizing four dzus fasteners.
(a) Unlock the fasteners and lift the control head free of the panel.
(b) Remove the electrical connection.
The CVR recorder unit located behind the aft baggage compartment within the pressurized vessel,
may be removed by:
(a) Removing the recorder cover.
(b) Loosen the wing lock nuts and remove unit.
3. Installation of CVR Unit
The CVR recorder unit
(a) Insert unit and tighten wing lock nuts.
(b) Replace recorder cover.
The CVR control unit
(a) Reconnect electrical connections.
(b) Place control head in panel and lock fasteners.
4. Testing
Functional test of the CVR unit:
(a) Push and hold "TEST" button located on the Cockpit Control Unit for a minimum of five
seconds. A 600 hertz generator is keyed and sequentially switched through the four channels
of the recorder. Each channel receives the test tone for approximately 0.8 seconds. The meter
circuit receives these signals and drives the meter, a "GO-NO-GO" indicating device, located
on the Cockpit Control Unit. The meter needle rises and comes to rest in the "GO" (green)
section of the meter scale.
EFFECTIVITY:
23-70-00
an
1090
Jan 10/90
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