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PS Engineering

PMA7000B Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-780-0005 Page 3-5 Rev. 11, February 2015

Anytime the PMA7000B is in either the COM 1/COM 2, COM 1/COM 3 ("Split Mode"), the pilot and copilot

intercom is controlled with the ICS button. The passengers will maintain intercommunications, but not 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. 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 in-

tercom or radio conversation ceases.

When in the ALL mode, pilot and copilot will hear Entertainment 1 input while all passengers will hear the

Entertainment 2 source. While in the CREW 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 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.

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PS Engineering PMA7000B Spezifikationen Seite 24