PS Engineering PMA7000CAP Installation Manual - Manual (Page 23)

PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual for Civil Air Patrol
200-072-0004 Page 3-6 Rev. 4, Sept. 2000
Anytime the PMA7000M-S is in either the C OM 1/C OM 2,C OM 1/C OM 3, or C OM 2/3 ("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. They
operate independently in the PMA7000M-S. The volume control does not affect 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.
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 entertainment 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 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. Pushing this button
places the ICS in “Karoake” 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 Karoake mode if a remote switch is
installed in the aircraft. See wiring information for details.