User Manual
Table Of Contents
- About your Bose® A20® Aviation Headset
- Components
- Preparing the Headset for Use11
- The battery compartment
- Connecting the headset to the aircraft
- Wearing and adjusting the headset
- Using the control module
- Primary and secondary audio sources
- AUX audio sources (wired)
- Bluetooth® audio sources (wireless)
- Using the headset with a Bluetooth® device
- Pairing the first device
- Pairing another device
- Switching between connected devices
- Bluetooth multi-function button
- Making and answering calls
- Reconnecting to a previously connected device
- Recovering a lost connection
- Disconnecting a Bluetooth device
- Clearing the headset pairing list
- Controlling Bluetooth volume
- Using the headset with a Bluetooth® device
- Secondary audio modes
- Cleaning the headset
- Instructions for continued airworthiness
- Managing multiple secondary sources
- Ordering parts and accessories
- Contact information
- Limited warranty
- Locating the headset serial number
- Mounting the aircraft panel connector
- Replacing parts
- Microphone windscreen

Headset Care and Maintenance
28 - English
Microphone windscreen
Remove the windscreen from the microphone as described in “Microphone
windscreen replacement” below.
Rinse and air dry the windscreen. Make sure the windscreen is completely dry, then
reattach.
Earcup inner screen
Do not attempt to remove, replace, repair, or clean this component. Located inside
the earcup, the inner screen is critical to proper headset operation. If the screen
appears to be damaged or worn out, contact Bose.
If the inner screen becomes damp from environmental moisture such as light rain,
dew, perspiration, or condensation, allow it to air dry only. Do not use electric
heaters, blowers, or hair dryers to dry the inner screen.
Headband cushion
1. Remove the cushion as described in “Headband cushion replacement” on
page 30.
2. Place the cushion in a solution of water and a mild detergent.
3. Allow the cushion to air dry, then reattach.
Replacing parts
Through normal use, parts like windscreens and ear cushions may require periodic
replacement. Replacement parts can be ordered directly from Bose Corporation.
Please refer to “Contact information” on page 42.
Microphone windscreen replacement
1. Gently slide or roll the windscreen off the microphone.
2. Slide the replacement windscreen on and make sure it fits completely over the
microphone.