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PS Engineering PMA4000 Panel Mounted Audio Panel / Intercom - TSO For Certified Aircraft

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Part# 11-01634
MFR Model# 11942


The PMA4000 is a 4-place panel mounted intercom with added capability for switching two communications transceivers and navigation receivers, as well as providing a speaker amplifier.

• Has independent intercom volume controls for the pilot, and the copilot.

• A multi-position mode switch allows the pilot to select either Pilot Isolate or All intercom modes.

• The ISO mode isolates the pilot from the intercom, and connects directly with the aircraft radios. The copilot and passengers are free to have conversation and enjoy the entertainment without radio interruption. The pilot is not distracted by passenger intercom use and has control over the radio communications.

• The "ALL" mode places everybody on a party line. Each person hears all intercom conversation and aircraft radio reception. Everyone hears the entertainment source as well.

• The "Off" mode is part of the automatic fail-safe interconnect to the aircraft systems. If power to the intercom is disrupted, the pilot's headset is automatically connected to the aircraft radio. This permits continuous radio communications.

• By harnessing the computational power of microprocessors, the PMA4000 eliminates complicated squelch adjustments. Individual squelch controls mean that the system can be tailored to different microphones, as well as variations in voice levels in the cockpit.

• Has two switched com transceiver inputs and two switched navigation receiver inputs. In addition, there are four un-switched audio inputs that can be used for other receivers or audio warnings such as autopilot disconnect or GPS alerts.

• There is a built in speaker amplifier in the unit. Pushing the volume control will place all selected audio, or any un-switched audio present, over a cabin speaker.

• With the PMA4000 installed, both pilot and copilot have transmit capability over the aircraft radios. Only the person who presses the PTT is heard over the radio. The selected com LED shows green when selected, and flashes during radio transmissions. This feature acts as a stuck microphone indication.
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WARNING: Cancer and Reproductive Harm -


  • DIMENSIONS: Height: 1.35 in. (3.4 cm) Width: 2.40 in. (6.1 cm) Depth: 6.50 in. (16.5 cm) behind panel
  • WEIGHT (With Connectors): 12.4 oz. (0.35 kg)
  • Voltage: 11 to 33 VDC (28 Volt w/dropping resistor)
  • Maximum Current: 0.25 Amp (Externally protected by a 3 Amp circuit breaker.)


  • PS Engineering requires all units to be sold with custom harness in order to maintain factory warranty. Units sold without harness will receive no factory warranty. All PS Engineering orders with custom wire harness are build to order and require all questions to be filled out to process correctly. Any custom order not complete will cause delays. All custom harnesses are built to IPC-WHMA-A-620 standards via the manufacturer’s installation manual. Any additional comments or special requests may be noted in the Special Instructions field at checkout for review by the avionics team. For questions regarding custom harnesses for PS Engineering please email or call us at 800-826-3160.
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Website says can only monitor one radio at a time but it monitors both ..... I also wired in the Vox/PTT intercom switch

May 4, 2021


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Regarding PMA4000 audio panel/intercom: when ordering without harness - what is in the box? Shall I have both DB-25 connectors to make wiring harness myself? What is PMA4000 Installation Kit: 250-0041-0001 and is it included in the package without harness?

In the documents tab, you can download the install manual that specifies what comes in the install kit. Connectors, pins and housing come in the box.

Q: The pictures show a rectangle unit and a round unit. Are both available? If so, how would we order the round one?

The PMA 4000 comes standard in the square layout but if you want it to fit in a 2-1/4" hole, you will need to buy the adapter 11-00395.

Q: What warranty does this PS Engineering PMA 4000 unit come with?

Per Manufacturers website the unit comes with a 1 year warranty

Q: Is there a version of this PS Engineering PMA 4000 product for non-certified aircraft?

No, only the TSO version is sold for the PMA 4000.

Q: What is the harness part number?

For a Two place harness: 11-13153 and for a four place harness: 11-13154. If you are purchasing online, once you add the intercom to your cart, a pop up will allow you to select a harness for the unit.

Q: Does the PMA 4000 allow you to monitor both radios at the same time?

No, it will be one radio at a time.

Q: Can I mount it vertically? Does it come with a vertical faceplate?

No this unit ships with a square face plate and has an optional 2-1/4" optional mounting plate that can be purchased separately.

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