No audio in one ear

Make sure the access cover has been installed correctly. It should sit flush with the earcup housing. Make sure no pins are bent inside the connector—this could prevent audio and ANR in that ear. Also, switch sides with the down cable and access cover. If the issue switches sides, try a new access cover.

Check for blockages in the headphone mesh grille and headphone opening. Excessive debris can result in low audio, poor sound quality or missing audio channels.

Put the audio selector switch on the headset control module in either the middle or top position. (Be sure it is not in the down / Intercom Only position.) Then, disconnect the headset from the panel and connect an audio device to the 3.5 mm aux input on the headset control module. If you have a headset with Bluetooth®, you can connect a Bluetooth device instead: If the issue still occurs with the aux device, there is an issue with the headset; if the issue is not present with the aux device, the issue is related to the panel settings or connections.

1. Remove the batteries from the control module
2. Determine the position of the AUDIO switch

• Set to Mono (right) by default. For use with mono intercoms and U174 connections. Routes single channel audio to both ears
• Set to ST (left) if the aircraft has a stereo intercom

3. If necessary, change the position of the switch using a push-pin or paperclip
4. Reinstall the batteries. Match the polarity on the batteries to the markings inside the battery compartment

If the switch is set to stereo and the headset is plugged into a mono audio system, audio will only be heard through the left earcup

Try the Intercom switch in the ST and the MONO position and determine if audio returns in both ears.

Some intercoms have a toggle switch or menu selection for stereo or mono operation. If the intercom is set to stereo but wired for mono, audio may still be heard in one ear when the operation switch is set to stereo.

Adjust the volume knob on the intercom and/or radio and listen for a change in the volume level.

Check for any debris in the connector on the aircraft and check if any of the six pins are missing inside the headset plug.

Note: If the aircraft has a jack for an older model Bose AHX headset that was wired to provide mono audio to the right earcup, the jack will need to be rewired since the electronics in the newer A20 cable differ.

If your product connects to the device using an extension cable or adapter, disconnect the extension cable or adapter to determine if the issue is related to it.

Non-TSO equipment, worn jacks/loose connections, or incorrectly wired jacks (i.e. reversed stereo or mic / ground wires) in the aircraft can cause issues. If available, try connecting the headset to another jack in the aircraft or to jacks in a separate aircraft. If the headset works fine when connected elsewhere, the panel jack or wiring to the jack is the issue.

The connectors at the end of the headset cable might have debris or corrosion on them. Apply a small amount of isopropyl alcohol to a cloth, wipe the metal connectors, then dry them with a clean cloth. Once cleaned and dried, connect the headset and try again.

If the steps provided do not resolve your issue, your product may need service. Follow the link below for more information on how to service your product. Depending on your product and region, you will be provided a contact number or the ability to setup service online.

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