PS Engineering PMA4000 Pilot’s Guide - Manual (Page 3)

3 PMA4000 TSO Pilot Guide & User Manual
Intercom Mode Selector Switch
Unit power is turned on and off by the mode se-
lector switch. In the
OFF or " FAIL - SAFE " position,
the pilot is connected directly to Com 1 allowing
transmit and receive capability regardless of unit
condition. Any time power is removed or turned
OFF , the audio selector will be placed in the fail-
safe mode. The switch is a 3-position mode
switch that allows the pilot to tailor the intercom
function to best meet the situation.
I
SO : (Up Position): The pilot is isolated from the intercom and is connected
only to the aircraft radio. He will hear the aircraft radio reception (and side-
tone during radio transmissions if provided by the transceiver). Copilot and
passengers will hear the intercom and music on Entertainment input, but
not the aircraft radio receptions or pilot transmissions.
A
LL : (Middle Position): All parties will hear the aircraft radio, intercom,
and music from entertainment input. However, during any intercom com-
munications, the music volume automatically decreases when SoftMute is
active . The music volume increases gradually back to the original level
after communications have been completed.
Speaker Amplifier
Pressing the volume control will activate the cockpit speaker. This switch
will place all selected audio on the cockpit speaker when selected. The
speaker is automatically muted when the radio push to talk (PTT) is active.
To reduce power consumption and internal heat buildup, switch off the
speaker amplifier when not in use.
Microphone (Transmit) Selector Switch
Microphone Selector
The up switch position is C OM 1. Both pilot and
copilot will be connected to the Com l transceiver.
While in the C
OM 1 or C OM 2 mode, the intercom
functions normally. Both the pilot and copilot have
transmit capabilities on the selected transceiver. All
hear the selected audio if the intercom is in the A
LL
mode. Only the person who presses their Push To
Talk (PTT), will be heard over the aircraft radio.
Placing the toggle switch in the C
OM 2 position will
place pilot and copilot on Com 2.
The PMA4000-Series has an automatic selector mode. Audio from the se-