PS Engineering PMA7000B Installation Manual - Manual (Page 24)

PS Engineering
PMA7000B Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-780-0005 Page 3-5 Rev. 10, December 2012
Anytime the PMA7000B is in either the C OM 1/C OM 2, C OM 2/C OM 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 Alternate Intercom Mode
If an external switch is installed, the PMA7000B can be placed into “Alternate Intercom Mode.” In this
mode, the passengers will not hear aircraft radio in the ALL intercom mode. In addition, the passengers’
microphones are not heard by the crew when the radios are active. (Available in serial numbers starting
with “J” or later)
3.6.4 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.
3.6.4.1 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 appro-
priate. 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.