PS Engineering PMA7000CAP Installation Manual - Manual (Page 22)

PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual for Civil Air Patrol
200-072-0004 Page 3-5 Rev. 4, Sept. 2000
LightSpeed 15K
20K 90015
Peltor 7003
7004 90010
90015
Pilot 11-20
11-90 90015
Sennheiser 90015
Telex Airman 750
AIR3000 90015
90010
3.6.2 Volume Control
The volume control knob adjusts the loudness of the intercom for the pilot and copilot only. It
has no effect on selected radio levels, music input levels or passengers' volume level.
Adjust the radios and intercom volume for a comfortable listening level for the pilot. Most
general aviation headsets today have built-in volume controls; therefore, passenger volume 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 passengers will hear copilot
intercom and Entertainment 2. Neither will hear aircraft radio receptions 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. Passengers can
continue to communicate with themselves without interrupting the Crew and also may listen to
Entertainment 2.