PS Engineering
PMA7000B Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-780-0004 Page 3-5 Feb. 2004
Anytime the PMA7000B is in either the COM 1/COM 2, COM 2/COM 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. Music 1 feeds the
pilot and copilot positions. They operate independently in the PMA7000B. The volume control does not
affect the music level.
While in the ISO (Isolate) mode, the copilot will hear Entertainment 1 while the four passengers 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.
When in the A
LL mode, pilot and copilot will hear Entertainment 1 input while all passengers will hear the
Entertainment 2 source. While in the C
REW mode, pilot and copilot will hear entertainment input #1 while
the passengers may listen to entertainment input #2.
3.6.3.2 Soft Mute and Soft Mute inhibit
The Soft Mute feature assures that the aircraft radio transmissions will not be missed due to entertainment
playing. When there is radio reception or intercom conversation, the music level is dropped to a low, or
background level. When the radio or intercom traffic ceases, the level gradually returns to normal.
The front panel ICS switch controls muting of entertainment source #1 (for pilot and copilot). Pushing this
button places the ICS in Karaoke (or sing along) mode, which inhibits the soft mute feature. This allows
the music to continue uninterrupted by intercom or radio traffic when cockpit workload is appropriate.
Pushing the button again will release the mute inhibit function.
The passenger music, source #2, can be placed in the Karaoke mode if a remote switch is installed in the
aircraft. See wiring information for details.
Table 3-2 Intercom Modes
Mode Pilot Hears Copilot Hears Passenger Hears Telephone Comments
Isolate
A/C Radios
Pilot Sidetone
(during radio transmis-
sion)
Entertainment 1 is
Muted
Copilot and passenger
intercom
Entertainment #1
Passenger and Copilot
intercom
Entertainment #2
“Phone Booth” mode
Pilot has exclusive use of
the telephone.
In TEL, Pilot & Copilot con-
nected to Com 1 for PTT TX
and receive. Others hear Tel
if off hook.
This mode allows the
pilot to communicate
without the others both-
ered by the conversa-
tions. Copilot and pas-
sengers can continue to
communicate and listen
to music
All
Pilot
Copilot
A/C Radio
Passengers
Entertainment #1
Copilot
Pilot
A/C Radio
Passengers
Entertainment #1
Passengers
Pilot
Copilot
A/C Radio
Entertainment #2
All have access to phone
through Hook Switch. Pilot
access through TEL switch.
All hear telephone audio if
off hook.
This mode allows all on
board to hear radio re-
ception as well as com-
municate on the inter-
com. Music and intercom
is muted during intercom
and radio communica-
tions
Crew
Pilot
Copilot
A/C Radio
Entertainment #1
Copilot
Pilot
A/C Radio
Entertainment #1
Passengers
Entertainment #2
Pilot and copilot don’t have
phone access, unless mic
sel in TEL. Passengers
have phone through Hook
Switch, Passengers hear
phone audio.
This mode allows the
pilot and copilot to con-
centrate on flying, while
the passengers can
communicate amongst
themselves.
3.7 Telephone Mode
The Com 3 mode can serve as a full duplex interface for telephone systems such as AirCell or portable
cellular phones with earpiece jacks, if the installation is correctly configured. When interfaced with an ap-
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