PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-070-0004
Page 3-6
Rev. 4, Oct.200-070-0006
Page 3-6
When in the A
LL
mode, pilot and copilot will hear Entertainment 1 input while all passen-
gers 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.
It is also possible to use only one entertainment input device for both entertainment inputs.
It is suggested however, that a switch (DPDT) is installed between the single entertain-
ment device and entertainment input #1. This will allow the pilot and copilot decide if they
hear entertainment while in the Crew mode.
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 mu-
sic 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. Pushing this but-
ton 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 connected to
Com 1 for PTT TX and re-
ceive. Others hear Tel if off
hook.
This mode allows the pilot
to communicate without
the others bothered by the
conversations. Copilot and
passengers 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 recep-
tion as well as communi-
cate on the intercom.
Music and intercom is
muted during intercom
and radio communications
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 concentrate
on flying, while the pas-
sengers can communicate
amongst themselves.
3.7 Telephone Mode
Each intercom position has a "hook switch." The pilot's hook switch is the "TEL" mode
on the audio panel, the others are discrete switches mounted adjacent to the headset jacks.
When the intercom is in
ALL
mode, the pilot can speak on the phone only if the mic se-
lector switch is in
TEL
position. All intercom positions will hear the telephone conversa-
tion. Anyone who places his or her switch into the “off-hook” position will also be heard