PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-070-0006
Page 2-10
Rev. 6, Nov 98
PMA7000M-S J2, pin M is the passenger hook switch. Install a SPST switch in a location
adjacent to each passenger headset where cellphone use is desired. When pin M is con-
nected to ground through any switch, the passenger microphones are all on the cellphone
system.
The wireless communication “tel” system utilizes an intercom loop. Therefore, any time
the cellphone is in use from the pilot or copilot side, pilot and copilot will lose intercom
capability. In the ALL mode, when the passengers’ activate the cell phone, the pilots will
have intercom, and continue to hear and transmit over the avionics normally. However the
passengers will not have intercom, because they are on the telephone.
To prevent unwanted distractions, only the pilot and copilot will hear an incoming call ring
signal. They can then decide to allow a passenger to activate the hook switch and use the
telephone.
If the pilot has selected “TEL” mode, the passengers cannot access the telephone in the
“CREW” intercom mode, but they will hear the call.