PS Engineering PMA7000M-S Installation Manual - Manual (Page 24)

PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-070-0012 Page 3-5 Rev. 12, Sept.2000
only when the unit is not in the "Split" mode. Then, the pilot and copilot intercom is controlled with the ICS
button.
I SO : (Up Position): The pilot is isolated from the intercom and is connected only to the aircraft radio sys-
tem. He will hear the aircraft radio reception (and sidetone during radio transmissions). Copilot will hear
passengers’ intercom and Entertainment 1, while passengers will hear copilot intercom and Entertainment 2.
Neither will hear aircraft radio receptions or pilot transmissions.
A LL : (Middle Position): All parties will hear the aircraft radio and intercom. Crew will hear Entertainment
1, passengers will hear Entertainment 2. During any radio or intercom communications, the music volume
automatically decreases. The music volume increases gradually back to the original level after communica-
tions have been completed.
C REW (Down Position): Pilot and copilot are connected on one intercom channel and have exclusive access
to the aircraft radios. They may also listen to Entertainment 1. Passengers can continue to communicate
with themselves without interrupting the Crew and also may listen to Entertainment 2.
Anytime the PMA7000M-S is in either the C OM 1/C OM 2, C OM 2/C OM 1 ("Split Mode"), the pilot and co-
pilot 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 inde-
pendently 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. However, it is
suggested that a switch (DPDT) be installed between the single entertainment device and entertainment in-
put #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 (for pilot and copilot). 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.