Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 402 / 1956

PAGE 2
Feb 28/07
2H4
23-50-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
2. System Functional Test (See Figure 2.)
A. On Ground
The following known good equipment is required prior to performing this test: microphone, headset,
speaker and avionics receivers.
(1) Lamp Test
(a) Apply power to the unit by rotating the pilot intercom knob clockwise.
(b) The test button checks the internal LED annunciator and marker beacon lamps. Press
TEST to confirm operation of the LED’s. Cover the photocell with a finger and observe
that the LED annunciators dim automatically. Check the front panel back-lighting and
dimming function. Each annunciator contains a lamp for illumination.
(2) Fail-safe Operation Check
(a) Turn the unit off by rotating the pilot intercom knob counterclockwise.
(b) Check fail-safe operation by exercising the COM 1 microphone, microphone key and
audio over the headphones.
(c) Turn the unit back on to continue testing.
(3) Transceiver Operational Check
(a) Perform a ramp test radio check by exercising the installed transceivers, microphone,
microphone key and audio over the headphones and speaker.
(b) Verify that communications are loud and clear and push-to-talk (PTT) operation is correct.
(4) Intercom System (ICS) Check
(a) Set the intercom to the ALL mode (Crew and Pilot LED’s off).
(b) Plug in headsets at each ICS position.
(c) Adjust squelch and volume for each position and verify that the ICS is working properly.
(d) Check Pilot and Copilot ICS positions for isolation and proper operation of volume and
squelch controls.
(e) Press the PA button. Verify that microphone audio is heard over the speaker.
(5) Aircraft Receivers Check
(a) Select the audio source corresponding to each installed avionics unit and check for audio
over the headsets.
(b) Check for Pilot/Copilot audio isolation when pressing the COM 1/2 button.
(c) Press the SPKR button and verify that any selected audio is heard over the speaker.
(6) Music System Check
Connect a stereo music source to MUSIC 2. Press the CREW button to set the ICS to the crew
mode. Verify that stereo audio is heard in the passenger headsets only.
B. In Flight
Verify proper operation of the marker lamps and marker audio, including the marker audio mute
function. Check proper operation of the marker sensitivity selection (using the SENS button) by
flying towards the outer marker position initially using HI sensitivity. When the OM audio is just
barely audible in the headset, switching to LO sensitivity should reduce or eliminate the audio.