PS Engineering PMA7000H Pilot’s Guide - Manual (Page 6)

6
PMA7000H Pilot Guide
202-780-0429
lose one channel, unless they switch to the “MONO” mode on the headset.
Intercom Modes
The lower switch on the left side is a 3-position mode switch that allows
the pilot to tailor the intercom function to best meet the current cockpit
situation. The description of the intercom mode function is valid 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 system. 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 transmis-
sions.
A
LL : (Middle Position): All parties will hear the air-
craft radio and intercom. Crew will hear Entertain-
ment 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 communications 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 Entertain-
ment 2.
Anytime the PMA7000H is in either the Split Mode ("C
OM 1/C OM 2, C OM
1/C OM 3"), the pilot and copilot intercom is controlled with the ICS button.
The passengers will maintain intercommunications, but never hear aircraft
radios.
Alternate Intercom Mode
If an external switch is installed for the purpose, the PMA7000B can enter
“Alternate Intercom Mode.” When the intercom is in ALL mode, with al-
ternate mode enabled the passengers will NOT hear the aircraft radios, but
they will hear the crew on the intercom. In addition, the crew microphones
will be blocked from the crew headsets while the radio audio is active.
PTT ICS
The PMA7000H is equipped with a push-to-talk (P-T-T-) intercom system
(ICS) foe use in ambient noise conditions where the IntelliVOX® is not
practical. The PTT ICS controls are mounted in the aircraft, not in the
PMA7000H. Placing the PMA7000H in ICS PTT mode will prevent the
pilot and copilot microphones from opening, unless the respective ICS PTT