PS Engineering
PMA7000M-S Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-070-0006 Page 1-2 Rev. 6, Nov 98
allows the user to listen to the receiver(s) selected on the cabin speaker. Except for the
unswitched inputs, all speaker audio is muted during transmit.
A rotary switch selects one of the three communication transceivers for the pilot and co-
pilot position, and allows radio transmission. In "Split Mode" the PMA7000M-S has the
ability to allow the pilot and copilot to operate different transceivers independently. The
TEL mode allows the pilot to use the cellular telephone interface. External switches per-
mit telephone operation for the copilot and passengers.
A fail-safe mode connects the pilot headphone and microphone to COM 1 if power is re-
moved for any reason, or if the power switch is placed in the Off (Fail-safe) position.
A six-station voice activated (VOX) intercom is included in the PMA7000M-S. This sys-
tem has PS Engineering’s exclusive IntelliVox™ circuitry that eliminates manual adjust-
ments. The system contains six separate VOX mic circuits, and only opens the microphone
channel in use.
The intercom system incorporates pilot isolate and crew modes, two stereo (or mono de-
pending on unit) music inputs with "Soft Mute," and LED indicators for swap and trans-
mit indications. Intercom control is through front panel-mounted knob and 3 position
mode switch. A single volume controls intercom level for the pilot and copilot. Passenger
headphone volume is factory set, and adjusted in flight with headset-mounted volume
controls. Passenger volume control is further adjustable through screwdriver access in the
top of the unit. Intercom squelch is automatic.
An optional 3-light Marker Beacon receiver is integrated in the PMA7000M-S. This pro-
vides the necessary Marker Beacon lights and audio indications necessary for an Instru-
ment Landing System (ILS) approach.
1.4 APPROVAL BASIS - FAA
TSO Approval.
The PMA7000M-S, and PMA7000S Audio Selector Panels are FAA approved under
TSO C50c (Audio Amplifiers) and TSO C35d (Marker Beacon Receivers).
All systems comply with relevant portions of RTCA DO-143 (Marker Beacon Receivers),
DO-160C (Environmental Conditions and Test Procedures for Airborne Equipment),
DO-178B (Software Considerations for Airborne Equipment) and DO-214 (Audio Sys-
tems Characteristics and Minimum Operational Performance Standards for Aircraft
Audio Systems).
NOTE: The optional message annunciators contained in Option 1 and Option 2 are not
TSO-approved, and the installer must determine the relevant approval basis prior to in-
stallation. Contact PS Engineering for information regarding FAA approval.
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