Bose 400521 User Manual
A20™ AVIATION HEADSET
Owner’s Guide
Tab 8, 16 Tab 7, 15 Tab 6, 14 Tab 5, 13 Tab 4, 12
SAFETY INFORMATION
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EnglishTab2, 10
NOTE: This equipment has been tested and
found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to
provide reasonable protection against
harmful interference in a residential
installation. This equipment generates, uses
and can radiate radio frequency energy and,
if not installed and used in accordance with
the instructions, may cause harmful
interference to radio communications.
However, there is no guarantee that
interference will not occur in a particular
installation. If this equipment does cause
harmful interference to radio or television
reception, which can be determined by
turning the equipment off and on, the user is
encouraged to try to correct the interference
by one or more of the following measures:
– Reorient or relocate the receiving antenna.
– Increase the separation between the
equipment and receiver.
– Connect the equipment into an outlet on a
circuit different from that to which the
receiver is connected.
– Consult the dealer or an experienced
radio/TV technician for help.
Changes or modifications not expressly
approved by Bose Corporation could void
the user's authority to operate this
equipment.
Operation is subject to the following two
conditions: (1) This device may not cause
harmful interference, and (2) this device
must accept any interference received,
including interference that may cause
undesired operation.
Bose Corporation hereby declares
that this product is in compliance
with the essential requirements
and other relevant provisions of
Directive 1999/5/EC and other
applicable Directives. The
complete Declaration of
Conformity can be found at
www.Bose.com/compliance.
COFETEL CFT/D03/USI/DGB/xxxx/xx
Operate this product within the temperature
range of 5°F to 131°F (-15°C to 55°C) only.
Important Safety Instructions
• Please read these instructions carefully
and completely before using the headset
• Make these instructions easily accessible
to all users at all times. Always include
these instructions when passing the
headset on to third parties.
• During flight operations, do not use the
headset for telephone calls.
• It is the responsibility of each aircraft
operator or pilot in command to
determine that any and all portable
devices will be free of any interference
with the navigation or communication
system of the aircraft. In addition, it is
their responsibility to determine the
suitability of the performance of portable
devices in relation to the use of the Bose
A20 Headset.
• The headset is capable of producing
sound pressure levels exceeding
85dB(A). In many countries 85dB(A) is
the maximum legally permissible level for
continuous noise exposure during the
working day. Exposure to sounds of
higher volume levels or longrt durations
can permanently damage your hearing.
• Never repair or attempt to repair a
defective headset yourself. Contact your
Bose Aviation Headset Department.
Refer to “Contact information” on
page 37
• Do not immerse the headphones in water
or any other liquid. See “Cleaning the
headset” on page 23 for cleaning
instructions.
• Warning:
Choking hazard,
Keep the
batteries away
from children.
• Danger of explosion if battery is
incorrectly replaced. Replace only with
the same type. Battery may cause a fire
or chemical burn if mishandled. Do not
recharge, disassemble, heat or
incinerate. Dispose of used battery
properly.
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Tab 6, 14
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Contents
ADVISORIES 1
Operational advisory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Hearing safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Volume control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Recognizing aircraft sounds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Using audio sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Headset earcup requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Earcup inner screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INTRODUCTION 4
What’s included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
What’s in the carton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Control module variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Power and cable variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
PREPARING THE HEADSET FOR USE 8
The microphone assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Attaching the microphone assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
The battery compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Opening the battery compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
The operation switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Inserting and replacing the batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Connecting the headset to the aircraft . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Using the 6-pin plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Using the dual general aviation plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Using other plug types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
USING THE HEADSET 13
Wearing and adjusting the headset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Conditions related to fit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Microphone placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Clothing clips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Using the control module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Volume control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Auxilliary (AUX) audio input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Audio priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Using the headset with a Bluetooth® enabled phone . . . . . . . . . . . . . . . . 19
Pairing the Headset with your phone . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Bluetooth® volume control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Making and answering calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
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Tab 3, 11
EnglishTab2, 10
HEADSET CARE AND MAINTENANCE 23
Instructions for continued airworthiness . . . . . . . . . . . . . . . . . . . . . . . . . 23
Cleaning the headset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
General cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Headset earcup openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Microphone windscreen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Earcup inner screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Headband cushion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Replacing parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Microphone windscreen replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Ear cushion replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Battery replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Headband cushion replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Microphone assembly or access cover replacement . . . . . . . . . . . . . . .26
TROUBLESHOOTING 27
In case of difficulty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
INSTALLATION 31
Mounting the aircraft panel connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Details on making the connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
TECHNICAL INFORMATION 34
SERVICE & WARRANTY INFORMATION 36
Locating the headset serial number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Warranty period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Limited warranty service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
To return your headset to Bose for repair . . . . . . . . . . . . . . . . . . . . . . . .36
Contact information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Ordering parts and accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
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Tab 6, 14
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ADVISORIES
Operational advisory
The Bose® A20™ Aviation Headset incorporates Acoustic Noise Cancelling®
technology. As with any complex electronic device, it is possible for this
headset to fail during operation. Symptoms of failure may include loud tones,
distortion, and loss of communications signal in the headset when used in the
Acoustic Noise Cancelling
Note: The headset includes redundant circuit ry to reduce the effects of such failures
and to allow for continued use of the headset in the passive noise reduc ing mode.
In passive noise-reducing mode, the volume controls on the control module will
automatically be set to maximum volume. If additional volume control is
needed, you can use the intercom or radio volume control.
Acoustic Noise Cancelling
powered on (power indicator is lit). The headset is in the passive mode when
the power is off (power indicator is not lit). See “Control module variations” on
page 6.
If your headset is aircraft powered, connect the headset to the aircraft power
sources only as described in “Connecting the headset to the aircraft” on
page 11. The headset will not operate properly if used with any other battery
source than the Bose
®
mode.
®
mode is active when the headset control module is
®
A20™ Aviation Headset control module.
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Tab 3, 11
EnglishTab2, 10
ADVISORIES
Hearing safety
The headset is intended for use with the Acoustic Noise Cancelling® mode
turned on. Noise reduction and communications performance are reduced with
Acoustic Noise Cancelling
Volume control
Make sure your aircraft communications system volume control is easily
accessible. This control affects the strength of the communications signal
coming into the headset.
As pilot in command, you must be sure you can understand critical
communications even with Acoustic Noise Canc elling
case, you may need to turn up the aircraft communications system volume.
Avoid setting the volume controls at levels high enough to impair your hearing
during extended periods of headset use .
Recognizing aircraft sounds
With the headset’s active and passive noise reduction, typical aircraft sounds
(from engines, propellers, warning alarms, and other sound sources) may not
sound familiar. We strongly advise you to make sure you can hear and
recognize these sounds when using the Bose
operating any aircraft.
®
mode turned off.
®
mode turned off. In this
®
A20™ Aviation Headset while
Using audio sources
When listening to in-flight entertainment, or a portable audio source through a
®
Bose
A20™ Aviation Headset, be sure to limit the volume to safe level s that do
not interfere with your ability to hear informational sounds and warning alarms,
such as stall warnings or gear up, while piloting.
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TriPort®
opening
Microphone
opening
Earcup
inner screen
Tab 6, 14
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ADVISORIES
Headset earcup requirements
Proper headset operation requires that the headset TriPort® openings on the
earcup are kept free of debris. The headset T riPort
outside of each earcup and include two holes and a screen.
®
openings are located on the
Earcup inner screen
The protective inner screen is critical to the headset’s ability to reduce noise.
Do not attempt to remove, replace, or repair this screen. If screen replacement
seems necessary, contact Bose
®
Technical Support. See “Contact inf ormation”
on page 37.
If the screen gets wet or any foreign objects become lodged on or adjacent to
it, follow the instructions in “Headset Care and Maintenance” on page 23.
Storage
Store the headset in a ventilated area away from direct sunlight. Remove the
batteries before storing the headset for extended periods.
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Tab 3, 11
EnglishTab2, 10
INTRODUCTION
Congratulations on your purchase of a Bose® A20™ Aviation Headset. The
®
Bose
A20™ Aviation Headset is our most advanced aviation headset yet. It
delivers significantly increased noise reduction and provides a more
comfortable fit, without compromising the clear audio you expect from Bose.
Plus, it offers auxiliary audio input and is available with Bluetooth
®
mobile
phone connectivity.
What’s included
Each Bose® A20™ Aviation Headset is supplied with a control module, cable,
and carrying case. The type of control module and end-plug configuration
depends on the options you chose for your headset.
There are two options for the control module:
• Bluetooth
• Conventional control module
There are several end-plug configurations for the headset. Your headset falls
into one of two general categories:
• Dual-powered: Aircraft powered with battery
• Battery-only powered
®
control module
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Headphones
Carrying case
Batteries
3.5 mm adapter cable
Headset assembly: Accessories:
In-line clothing clip
In-line clothing clip
Control module
See “Control module
variations” on page 6
for options.
Cable connector (varies)
Tab 6, 14
What’s in the carton
Tab 8, 16Tab 7, 15
INTRODUCTION
Note: Cable connector types will vary based on model of headset. See “Power
and cable variations” on page 7 .
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Bluetooth®
Bluetooth
®
Bluetooth® control module Conventional control module
Left/Right volume controls*
Power button
Power indicator
indicator
Bluetooth®
Bluetooth
®
function button
Volume Up button
Volume Down button
*Control the intercom volume
Multifunction
switch:
Top
Intercom
prioritized
Middle
Intercom
mixed
Bottom
Intercom
only
Audio Priority
switch:
Top
Intercom
prioritized
Middle
Intercom
mixed
Bottom
Intercom
only
Auxilliary (AUX)
audio input
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EnglishTab2, 10
INTRODUCTION
Control module variations
If you opted for Bluetooth® capability, you received the Bluetooth® control
module. If not, you received the conventional control module.
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Tab 6, 14
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INTRODUCTION
Power and cable variations
The Bose® A20™ Aviation Headset is available for purchase in different
standard aircraft connector options to suit pilot needs includin g:
•Dual G/A
• 6-pin install*
•5-pin XLR
•U174
* An adapter is available from Bose to convert a 6-pin connector to a dual G/A
plug for additional connection flexibility. Other configurations require the
purchase of a cable assembly.
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Access
cover
Connector
pins
Microphone assembly
Connector pins
L for left
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EnglishTab2, 10
PREPARING THE HEADSET FOR USE
The microphone assembly
Your headset is shipped with the micr ophone assembly (boom micr ophone and
cable) attached to the left earcup. If the microphone assembly is packed
separately, you can attach it to either earcup.
Attaching the microphone assembly
Choose the earcup (L or R) to receive the microphone assembly. Also, make
sure that the earcup connector pins are clean and free of debris.
1. Use a phillips screwdriver to loosen the two screws on the access cover
near the bottom of the earcup where you want to attach the microphone
assembly.
2. Remove the access cover to reveal the connector pins on the earcup.
3. Carefully line up the microphone assembly to the small connector socket
on the earcup.
4. Slide the connector into the socket until it reaches the stop.
CAUTION: Do not force the connector into the socket, or earcup damage may
occur.
5. Tighten the screws to secure the assembly.
6. Attach the access cover to the earcup that does not have the microphone
assembly attached. Insert the screws, then align and tighten them.
Note: The headset will not work without the access cover installed.
CAUTION: Be sure to try the headset and properly test its operation before flight.
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Operation switches
Tab 6, 14
PREPARING THE HEADSET FOR USE
Tab 8, 16Tab 7, 15
The battery compartment
The Bose® A20™ Aviation Headset is shipped with factory-se t operation
defaults. If you want to alter these defaults, you can change the operation
switches located inside the control module battery compartment. If you do not
want to change any of the operation switches, skip ahead to “Inserting and
replacing the batteries” on page 10.
Opening the battery compartment
You must open the battery compartment to access the operation switches.
Press down firmly on the battery compartment cover finger indent and slide the
cover down.The cover is tethered to the module. Do not attempt to detach it..
Note: The battery compartment cover is designed to r emain secu r ely clo s ed. You
may need to use additional force when pressing down and releasing cover.
The operation switches
The operation switches control the Auto off function and whether you hear
mono audio in one or both ears.
To change the operation switches
1. Open the battery compartment.
2. If batteries are installed, remove them.
In the battery compartment, you can observe and change the switch positions.
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