PS Engineering
PMA8000 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0000
Page 3-4
Revision 9, June 2005
Table 3-1 Mic Muff ™ Part Numbers
Manufacturer
Model
Mic Muff™ Part Number
Bose Dynamic
Electret
M87 Dynamic
90010
90015
90020
David Clark
H10-30
H10-20, H10-40
H10-13.4
90010
90015
90015
Lightspeed All
90015
Peltor 7003
7004
90010
90015
Pilot
11-20 & 11-90
90015
Sennheiser
90015
Telex
Airman 750, Echelon
AIR3000
90015
90010
3.6.2 Intercom Volume Control (7)
The inner volume control knob adjusts the loudness of the intercom for the pilot and copilot. It has no ef-
fect on selected radio levels, music input levels or passengers' volume level.
The outer volume control knob controls intercom volume or the passengers. It has no effect on radio or
music levels.
Adjust the radios and intercom volume for a comfortable listening level. Most general aviation headsets
today have built-in volume controls; therefore, volume also can be further adjusted at the individual head-
set.
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
PMA8000 Stereo installation, one channel will be shorted. Although no damage to the unit will occur, all
passengers will lose one channel, unless they switch to the “MONO” mode on the headset. PS Engineering
modifies headsets to add stereo capability, using high-fidelity speakers. Contact factory for details.
3.6.3 Intercom Modes (8)
The “
ICS
” pushbutton switch on the left side of the panel provides the selection of the three intercom
modes. 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
Mode
button.
This button cycles through the intercom modes, from top to bottom, then bottom to top as: ISO, ALL Crew
and Crew, ALL, ISO. An LED shows which mode is currently active.
I
SO
:
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’ inter-
com and Entertainment 1, while passengers will hear copilot intercom and Entertainment 2. Neither will
hear aircraft radio receptions or pilot transmissions.
A
LL
:
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 de-
creases. The music volume increases gradually back to the original level after communications have been
completed.
C
REW
: 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 may listen to Entertainment 2.
