PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-070-0004
Page 3-5
Rev. 4, Oct.200-070-0006
Page 3-5
can be adjusted at the headset. If desired, passenger volume level can be adjusted by a
screwdriver adjustment at the top of the tray (see figure 2-1).
3.6.2.1 Mono headsets in Stereo Installation
All passenger headsets are connected in parallel. Therefore, if a monaural headset is
plugged in to a PMA7000M-S Stereo installation, one channel will be shorted. Although
no damage to the unit will occur, all passengers will lose one channel. PS Engineering
modifies headsets to add stereo capability, using high-fidelity speakers. Contact factory for
details.
3.6.3 Intercom Modes
The lower switch on the left side is a 3-position mode switch that allows the pilot to tailor
the intercom function to best meet the current cockpit situation. The description of the
intercom mode function is valid only when the unit is not in the "Split" mode. Then, the
pilot and copilot intercom is controlled with the ICS button.
I
SO
:
(Up Position): The pilot is isolated from the intercom and is connected only to the
aircraft radio system. He will hear the aircraft radio reception (and sidetone during radio
transmissions). Copilot will hear passengers’ intercom and Entertainment 1, while passen-
gers will hear copilot intercom and Entertainment 2. Neither will hear aircraft radio recep-
tions or pilot transmissions.
A
LL
:
(Middle Position): All parties will hear the aircraft radio and intercom. Crew will
hear Entertainment 1, passengers will hear Entertainment 2. During any radio or intercom
communications, the music volume automatically decreases. The music volume increases
gradually back to the original level after communications have been completed.
C
REW
(Down Position): Pilot and copilot are connected on one intercom channel and
have exclusive access to the aircraft radios. They may also listen to Entertainment 1. Pas-
sengers can continue to communicate with themselves without interrupting the Crew and
also may listen to Entertainment 2.
Anytime the PMA7000M-S is in either the C
OM
1/C
OM
2, C
OM
2/C
OM
1, ("Split Mode"),
the pilot and copilot intercom is controlled with the ICS button. The passengers will
maintain intercommunications, but never hear aircraft radios.
3.6.3.1 Entertainment Input
The audio selector panel has provisions for two separate entertainment input devices.
They operate independently in the PMA7000M-S. The volume control does not affect mu-
sic level.
While in the ISO (Isolate) mode, the copilot will hear Entertainment 1 while the four pas-
sengers will hear Entertainment #2. The pilot will hear entertainment 1, at a muted level.
In normal operation, whenever a person speaks, or if the aircraft radio becomes active, the
music will automatically mute and then will gradually return to the original listening level
when the intercom or radio conversation ceases.