PS Engineering
PMA7000BT Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-780-0204
Page 3-4
Rev. 1, July 2015
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
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
Intercom Volume Control
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
PMA7000BT 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.
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 sys-
tem. He will hear the aircraft radio reception (and sidetone during radio transmissions). Copilot will hear
passengers’ intercom and Ent
ertainment 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 communica-
tions have been completed.
C
REW
(Down Position): Pilot and copilot are connected on one intercom channel and have exclusive ac-
cess to the aircraft radios. They may also listen to Entertainment 1. Passengers can continue to communi-
cate with themselves without interrupting the Crew and also may listen to Entertainment 2.
Anytime the PMA7000BT is in either the C
OM
1/C
OM
2, C
OM
2/C
OM
1 ("Split Mode"), the pilot and copi-
lot intercom is controlled with the ICS button. The passengers will maintain intercommunications, but nev-
er hear aircraft radios.