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

Troubleshooting
English - 35
Bluetooth
®
audio source
Problem What to do
No audio from the
Bluetooth source
to the headset
while on a call
• On the control module, make sure the Secondary Audio Mode
selector is in the MUTE or MIX position.
• On the control module, make sure the Bluetooth feature is on, and
the Bluetooth indicator is flashing. If not, press
once.
• Make sure the phone and headset are in range (no more than 30
feet from each other).
• On the control module, make sure the Bluetooth volume is turned
up.
Headset does not
pair with a device
• On the control module, make sure the Bluetooth feature is on, and
the Bluetooth indicator is flashing purple. If not, press and hold
for one second.
• On the control module, make sure the Secondary Audio Mode
selector is in the MUTE or MIX position.
• Follow the instructions in “Pairing the first device” on page 21.
• Delete BOSE A20 from your device’s Bluetooth device list. Then
Try pairing again.
Cannot
answer/end
a call
• Make sure your phone is properly paired and connected to the
headset. Refer to “Using the headset with a Bluetooth® device” on
page 21.
Headset does
not reconnect
to a previously
connected device
• Make sure the device is in range of the headset (30 feet or 10 m).
• On the control module, make sure the Bluetooth feature is on, and
the Bluetooth indicator is flashing blue. If not, press
once.
• On the control module, make sure the Secondary Audio Mode
selector is in the MUTE or MIX position.
• On your device, make sure the Bluetooth feature is on.
• On your device, delete BOSE A20 from the Bluetooth device list.
Then try pairing again.
Auto on
Problem What to do
Headset does
not turn on
automatically
• Inside the battery compartment, make sure the Auto On (ON-OFF)
switch is set to ON. See “The operation switches” on page
12-12.
• The Auto On feature only works with 5 pin XLR, 6-pin and 8-pin
connector versions of the cable. Check the aircraft specs to see if
the jack is getting power from the aircraft’s electrical system.
Auto off
Problem What to do
Headset does
not shut off
automatically
• Inside the battery compartment, make sure the Auto Off (OFF-ON)
switch is set to ON. See “The operation switches” on page
12-12.
• It may take up to nine minutes for the headset to shut off when not
in use immediately after initial power up.
• Disconnect the headset from the aircraft. Then turn on the headset
and wait 15 minutes. If the headset does not turn off, contact
Bose Technical Support.