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What Pilot headset jacks Are Used in Boeing 737?

What Pilot headset jacks Are Used in Boeing 737?

Pilots operating Boeing 737 aircraft need a good headset to facilitate communication with air traffic control (ATC), among the crew, and to ensure safe and efficient flights. With so many headset and plug options available, and the need for airline pilots to periodically switch between and fly different aircraft with different headset connectors, how do you choose the right connector for your headset? In this article, I will shed some light on the most common headset connectors found on Boeing 737 aircraft to guide you in selecting the right connector. Let's delve into the specific types of headset plugs commonly found in Boeing 737 cockpits.

Twin Plugs

Most 737 aircraft in the US use standard dual plug (PJ-style) also called GA twin plugs. These plugs feature two separate pins – one for audio output (headphones) and the other for input (microphone). One thing to consider with Twin Plugs is that intercom jacks do not provide power for Active Noise Reduction (ANR) or the Bluetooth feature found on modern aviation headsets. Therefore to power a twin plug ANR headset, you'll need batteries in the control module of the headset.

XLR 5 Connector

There are some 737s equipped with XLR5 connectors. The 5-pin XLR plug is commonly found on Airbus aircraft. It provides a single connection that combines headphone audio, microphone input, and power supply. There are some cases where the aircraft XLR connector will not provide power necessitating the need for batteries.

6-PIN Connector

The 6-pin LEMO plug, also known as the Redel plug, is widely utilized in general aviation for intercom systems. LEMO connectors are known for their durability, reliability, and ability to power ANR headsets. They provide a secure and stable connection for voice transmission. Aircraft models such as Cirrus SR-22, Pilatus PC-12, and Diamond DA40 commonly feature the 6-pin LEMO plug, however they are not typically found on Boeing 737.


The choice of connector depends on options that were selected by the airline when the aircraft was ordered. You will need to verify what plugs are required for the specific aircraft that you will be flying and go for that connector on your headset. If your primary 737 is equipped with a powered XLR receptacle, then you should buy a headset with an XLR connector. This will eliminate the need for you to carry batteries. It would be best if you also carried adapters for the occasions when you need to fly an aircraft with twin plugs or LEMO. Aviation Headset Adapters are available for most plug types so you will be able to use your headset in the 737 regardless of the type of plug on your headset.

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