What is a LEMO Jack?

PJ-055 (top) and PJ-068 (bottom) General Aviation Audio Phone Connectors "NATO" plug type, commonly used on military aircraft and civil helicopters

The following electrical connectors are commonly used in aviation headsets:[1]

The XLR, LEMO and Fischer plugs are able to supply power for active noise cancellation.[5]

Certifications

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In the United States, the Federal Aviation Administration (FAA) issues Technical Standard Orders (TSOs) regarding equipment used on civil aircraft. The TSO for aviation headsets is C139, which includes requirements to withstand extreme heat and cold, decompression, and electromagnetic interference.[14] Some commercial airlines require the use of TSO-compliant headsets, as part of their operations manual.[15] This is a choice by the airline, not an FAA requirement.[16]

In Europe, the European Union Aviation Safety Agency (EASA) also issues TSOs. The TSO for aviation headsets is ETSO-C139. Again, this is not mandatory[17][18] but may be required by an airline.

References

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Q&A

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: Does this one jack/wire harness connect the headphone and microphone to the intercom? Can it be wired so my headset runs off the aircraft power instead of a battery?

This is the part you order if you want to put a LEMO panel power jack instead of installing mic/headphone jacks in the panel. You have to have a headset with the 6 pin LEMO plug for this to work without batteries in your headset.

Q: will this allow the use of the bose X as well as the new BoseA20?

This is for the installation of a 6 PIN Lemo power jack in the panel and is designed to work with any headset which is a 6 Pin Lemo Headset. The 6 PIN Lemo versions of the Bose X and A20 are supported.

Q: What diameter hole is required to mount the Bose A20 6 pin lemo connector install kit?

The connector requires a panel hole that is 12.5mm (0.49") wide, by 14.0mm (0.55") tall.

Q: How long are the harness wires? Is there a wiring diagram for this?

The wiring for the harness is three foot long. A step by step wiring diagram is included with the install connector kit.

Q: Can this me installed in addition to the GA connections or do the GA connections have to be removed? In other words what if you also wanted to keep the dual plug GA as well?

Yes, it is possible to have both jacks installed in the aircraft.

Q: If I install it to a Tango Headset, Will it charge the battery in the control unit?

No, this does not charge a Tango battery kit.

Q: Will it work with Lightspeed Zulu 3?

Yes this will work with all Lemo style headsets.

Q: What is the thread size and pitch for the nuts that hold it to the panel?

M14 x 1

Q: can this unit be soldered to the existing typical headset non-powered jacks... ? and be used either way? looking for a wire diagram

You can have both the Lemo and GA plugs but we believe the Lemo plug would need to be wired into the intercom separately. It would also need power.

Q: What is the LEMO part number of the 6-pin connector used on this cable?

You can use Bose A20 cable assembly 11-08734 or you can use an adapter to connect to the LEMO receptacle.

Q: Does this Bose 6 Pin LEMO headset install connector kit work with Lightspeed headset?

Yes, the any 6-pin Lemo style plug headsets will work with this female connector once installed.