Please read this owner’s guide carefully. Save this guide for future reference and make it easily accessible for passengers and third
parties who use the headset.
Safety Warnings:
• Turn the headset off if it emits any loud noise.
As with any complex electronic device, it is possible for this headset to fail during operation. Symptoms of failure, which
may include loud tones, distortion, feedback squeals and loss of communications signal in the headset, can occur in
either the Acoustic Noise Cancelling
loud noise and the related loss of communications in the Acoustic Noise
The headset will continue to provide communications in the passive noise reducing mode. If the problem persists, see
Troubleshooting on page 30.
•
Switch to an alternate communications method in the event of a headset issue.
In the unlikely event of any headset issue or failure in the passive noise reducing mode, switch to an alternate
communications method and use standard cockpit resource management skills to minimize distractions.
•
Be aware of sound differences while wearing the headset.
With the headset’s active and passive noise reduction, typical aircraft sounds (such as from engines, propellers, and
stall or gear up warnings) will not sound familiar on your rst few ights. Such important sounds may be quieter than you
are used to. You are responsible for making sure that you can hear, notice and recognize these sounds when using the
headset while operating any aircraft.
•
Use the headset at a moderate volume level.
To avoid hearing damage, use the headset at a comfortable, moderate volume level. Limit the headset volume to safe
levels that do not interfere with your ability to hear informational sounds and warning alarms, such as stall warnings or
gear up, while piloting.
•
Do not make phone calls while piloting.
During ight operations, do not use the headset for telephone calls.
•
Make sure your aircraft communications system volume control is easily accessible.
Make sure you can understand critical communications even with Acoustic Noise Cancelling turned off. We recommend
that you set the audio system volume so that you can understand radio communications in passive mode, in full aircraft
noise, then use the control module’s volume controls to set a comfortable level with Noise Cancelling on. In passive
mode, the control module will automatically switch to maximum volume. 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 13.
•
Make sure portable devices do not interfere with the aircraft’s navigation and communication systems.
It is a pilot’s responsibility to ensure that portable devices do not interfere with the aircraft’s navigation and communication systems, as well as to determine if the portable device is suitable for use with the Bose
•
Make sure AUX source volume is turned up.
If the AUX source audio volume is set at a low level, it may be below the detectable threshold or may cut in and out.
•
Do not use the headset with a helmet or as part of a crash protection system.
The headset is not intended for such use, and has not been certied for crash protection. Dismantling, reassembly
or modication of the headset, or any part, for use in a helmet or other crash protection system could result in severe
bodily injury and such unauthorized use will void the limited product warranty.
•
Use only AA alkaline batteries.
Replace the batteries only with AA alkaline batteries (IEC LR06). There is a danger of explosion if batteries are incor-
rectly replaced with any other battery chemistries. Batteries may cause a re or chemical burn if mishandled. Do not
recharge, disassemble, heat, or incinerate batteries. Dispose of used batteries properly, following any local regulations.
The headset will not operate properly if used with any battery source other than the Bose A20 Aviation Headset control
module.
•
Keep batteries out of reach of children.
®
mode (turned on) or in the passive mode (turned off). If the headset emits any
Cancelling mode, turn of
f the power switch.
®
A20® Aviation Headset.
WARNING: Contains small parts which may be a choking hazard. Not suitable for children under age 3.
WARNING: This product contains magnetic material. Contact your physician if you have questions on whether
this might affect the operation of your implantable medical device.
This symbol means the product must not be discarded as household waste, and should be delivered to an
appropriate collection facility for recycling. Proper disposal and recycling helps protect natural resources,
human health and the environment. For more information on disposal and recycling of this product, contact
your local municipality, disposal service, or the shop where you bought this product.
China Importer: Bose Electronics (Shanghai) Company Limited, Part C, Plan 9, No. 353 North Riying Road, China (Shanghai)
Pilot Free Trade Zone
EU Importer: Bose GP, Castleblayney Road, Carrickmacross, Ireland
Taiwan Importer: Bose Taiwan Branch, Room 905, 9F, Worldwide House, 131 Min Sheng East Rd, Section 3, Taipei, Taiwan, 105
2 - English
Important Safety Information
Cautions Regarding Maintenance and Repair:
• Do not repair the headset yourself.
Do not attempt to remove, replace, or repair the protective inner screen on the inside of the earcup, which is critical to
the headset’s performance. If screen replacement or other repair seems necessary, contact Bose Technical Support.
See “Contact information” on page 39. 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 25.
Keep the earcup free of debris.
Proper headset operation requires that the headset TriPort® and microphone openings located on the outside of each
earcup are kept free of debris to ensure clear communications. See “Cleaning the headset” on page 26 for cleaning
instructions.
Regulatory Information
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 this equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Re-orient or relocate the receiving antenna.
•
Increase the separation between this equipment and receiver
• Connect this equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult Bose or an experienced radio/TV technician for help.
•
Changes or modications not expressly approved by Bose Corporation could void the user’
This device complies with Part 15 of the FCC rules. 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.
This device complies with FCC and Industry Canada RF radiation exposure limits for general population. It must not be collocated
or operating in conjunction with any other antenna or transmitter.
Operate this product within the temperature range of 5°F to 131°F (-15°C to 55°C) only.
Bose Corporation hereby declares that this product is in compliance with the essential requirements and other
relevant provisions of Directive 1999/5/EC and all other applicable EU directive requirements. The complete
declaration of conformity can be found at: www.Bose.com/compliance.
Toxic or Hazardous Substances and Elements
Part NameLead (Pb)Mercury (Hg)Cadmium (Cd)
PCBsXOOOOO
Metal partsXOOOOO
Plastic partsOOOOOO
SpeakersXOOOOO
CablesXOOOOO
Names and Contents of Toxic or Hazardous Substances or Elements
This table is prepared in accordance with the provisions of SJ/T 11364.
O: Indicates that said hazardous substance contained in all of the homogeneous materials for this part is below the limit requirement of
GB/T 26572.
X: Indicates that said hazardous substance contained in at least one of the homogeneous materials used for this part is above the limit
requirement of GB/T 26572.
Date of manufacture: The rst underlined digit in the serial number indicates the year of manufacture; “5” is 2005 or 2015.
.
s authority to operate this equipment.
Hexavalent
(CR(VI))Polybrominated Biphenyl (PBB)
Polybrominated
diphenylether (PBDE)
Please complete and retain for your records:
The serial number can be found underneath the headband cushion.
Serial number ______________________________________________________________________________
Purchase date _____________________________________________________________________________
We suggest you keep your receipt with this owner’s guide.
The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc., and any such use by Bose Corporation is under license. All
other marks are property of Bose Corporation.
Warranty and service information ................................................... 40
Locating the headset serial number .................................................................................40
Limited warranty service ....................................................................................................40
Contact information ..............................................................................................................41
Ordering parts and accessories .......................................................................................... 41
English - 5
Introduction
About your Bose® A20® Aviation Headset
With the Bose® A20® Aviation Headset, you can rely on crisp, clear audio and
significant noise r
the headset to secondary audio sources such as smartphones or tablets.
eduction for all cockpit communications. You can also connect
Our commitment to you
We take great pride in designing each of our products with the goal of providing the highest performance possible in the price range of that product. We strive
to reproduce the musical sounds as closely as possible to those of the original
performance. And we strive to avoid flashy sounds such as those associated with
accentuated bass and/or treble frequencies. While those sounds may be initially
attractive to the novice, they are not real and are not enduring. In addition, we use
only the highest-quality parts and the latest assembly and quality control techniques to ensure the reliability and long life of our products.
Our reputation rests on our steadfast pursuit of this policy in music and entertainment systems for the home, the automobile, and businesses. At Bose, we are
committed to investing in research that continually gives rise to new technologies
for improving sound reproduction.
When you purchase any product from Bose, we encourage you to compare it, as
we do, to competitive products. We believe that this process will enhance your
appreciation of the product you select. With best wishes from all of us at Bose for
many years of enjoyment.
What’s included
The headset includes a control module, cable, and carrying case.
The type of control module and connector configuration depends on the options
you chose for your headset.
There are two options for the control module:
• Control module with Bluetooth
•
Conventional contr
There are several end-plug configurations for the headset. Your headset falls into
one of two general categories:
• Battery powered: Operates with battery power only.
• Dual powered: Operates with either aircraft or battery power. No battery needed
when connected to aircraft power. This version is often called Flex powered and
comes with an Auto On function.
ol module
®
compatibility
6 - English
Components
Headset
Clothing clip
Introduction
Carrying case
2 AA alkaline
batteries*
Control module
See “Control module
variations” on page 8
for options
3.5 mm AUX audio cable
Second
clothing clip
Cable connector (varies)
Note: Cable connector types will vary based on model of headset. See “Power and
cable variations” on page 9.
Warning: * Replace batteries with alkaline batteries only. Do not use any other
battery chemistries.
English - 7
Introduction
Control module variations
If you purchased the Bluetooth version of the headset, you received the Bluetooth
control module. If not, you received the conventional control module.
Bluetooth
Bluetooth
indicator
Bluetooth
multi-function
button
Secondary Audio
Mode selector:
Mute
Intercom
prioritized over
secondary
sources
Mix
Intercom
mixed with
secondary
source(s)
Off
Intercom only
®
control moduleConventional control module
Left/Right
Intercom Volume controls
Power indicator
Power button
Bluetooth
Volume Up button
Bluetooth
Volume Down button
Auxiliary (AUX)
audio input
Secondary Audio
Mode selector:
Mute
Intercom
prioritized over
secondary
sources
Mix
Intercom
mixed with
secondary
source(s)
Off
Intercom only
Note: When the Secondary Audio Mode selector is in the Mute or Mix position,
you will hear a maximum of two audio sources – the intercom plus one
secondary source. See “Secondary Audio Mode selector” on page 24.
8 - English
Introduction
Power and cable variations
The Bose® A20® Aviation Headset is available for purchase in different standard
aircraft connector options, including:
Battery powered options
Operate with battery power only
Dual G/A6-pin*
U1745-pin XLR
U3848-pin
Dual powered options
Operate with either aircraft or battery power
No battery needed when connected to aircraft power
* An adapter is available from Bose to convert a 6-pin connector to a dual G/A or
U174 plug for additional connection flexibility.
Note:
Many dif
ferent combinations of control module, microphone, connector
and cable types are available. Contact Bose Technical Support for more
i nformation.
English - 9
Preparing the Headset for Use
e microphone assembly
Your headset may be shipped with the microphone assembly (boom microphone
and cable) attached to the left earcup. If you prefer, you can switch it to the right
earcup.
If your headset is shipped with the microphone assembly packed separately, you
can attach it to either earcup.
Attaching the microphone assembly
Choose the earcup (L or R) where you want to attach the microphone assembly.
Also, make sure that the earcup connector pins are clean and free of debris.
1.
Use a Phillips scr
near the bottom of the earcup where you want to attach the microphone
assembly.
2. Remove the terminator cover to reveal the connector pins on the earcup.
3.
efully line up the microphone assembly to the small connector socket on
Car
the earcup.
4. Slide the connector into the socket until it reaches the stop.
ewdriver to loosen the two screws on the terminator cover
L (left)
Terminator
cover
Connector
pins
Microphone
assembly
Connector pins
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 terminator 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 terminator cover installed.
Caution: Be sure to try the headset and fully test its operation before flight.
10 - English
Preparing the Headset for Use
AUTO OFF
ON - OFF
AUTO ON
ON - OFF
e battery compartment
The headset is shipped with factory-set operation defaults. If you want to alter
these defaults, you can change the operation switches located inside the control
module battery compartment.
Opening the battery compartment
Press down firmly on the finger indent and slide the cover down. The cover is
tether
ed to the module. Do not attempt to detach it.
Note: The battery compartment cover is designed to remain securely closed. You
may need to use extra force when pressing down and releasing the cover.
e operation switches
The operation switches control: Priority (BT-AUX); Intercom (MON-ST); Auto On
feature; and Auto Off feature. For details see the table on page 12.
• The Auto On feature is only
available for aircraft powered
versions.
• The Intercom (MON-ST)
option is only available for
headset configurations that
support two-channel or
stereo intercom systems.
ON - OFF
AUTO ON
AUTO OFF
ON - OFF
The Priority (BT
•
-AUX)
option is only available for
Bluetooth
headsets.
Changing 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.
3. To change a switch position, use a pen or a small, flat-tipped screwdriver to
gently move the switch.
English - 11
Preparing the Headset for Use
This table shows possible positions, default setting, and purpose for each
operation switch.
Operation Switch Purpose
PRIORITY
(Available for
Bluetooth
headsets only)
INTERCOM
(Available
for headset
configurations
that support
two-channel or
stereo intercom
systems only)
AUTO ON
(Available for
aircraft powered
headset versions
only)
AUTO OFF
®
Establishes priority between two secondary audio
sources. Select BT to give the Bluetooth (wireless)
connection higher priority. Select AUX to give the wired
connection higher priority.
See “Setting the Priority (BT-AUX) switch” on page 25.
For most configurations, set at the factory for mono
audio systems (to provide audio in both ears).
Set it to stereo (ST) if your aircraft has a stereo intercom.
Set at the factory to enable the Auto On function. The
headset will turn on when aircraft power is available.
To disable Auto On, set the switch to OFF. With the
switch in OFF position, the user must manually turn the
headset on.
Set at the factory to enable the Auto Off function.
The headset will turn off after three to nine minutes of
inactivity.
To disable Auto Off, set the switch to OFF. With the
switch in OFF position, the user must manually turn the
headset off.
Auto On
With aircraft powered versions (5-pin XLR, 6-pin, and 8-pin) the headset will turn
on automatically when aircraft power is available. If you do not want the headset to
turn on automatically, set the switch position to OFF.
Auto Off
The Auto Off feature detects when the headset is not in use and shuts it off after
several minutes to preserve battery power. The exact time it takes to shut off varies
and can range between three to nine minutes after you stop using the headset.
When the headset is running on battery power and is not plugged in to a
intercom, it will shut off, unless there is an active AUX audio source present.
If you are on a phone call and unplugged from the intercom, the headset will allow
you to complete your call, then it will turn off approximately three minutes after the
call is ended.
12 - English
power
ed
Preparing the Headset for Use
Inserting and replacing the batteries
Caution: If the batteries do not fit correctly, do not force them in. Forcing an
1. Turn off headset power.
2. Press down firmly on the battery compartment cover and slide the cover to
3.
4.
Warning:
Note: For air
impr
oper connection will cause permanent damage to the control
module.
release. The battery door is tethered. Do not detach the door from module.
Insert two alkaline AA batteries into the contr
polarity.
Replace the battery compartment cover
Replace batteries with alkaline batteries only
battery chemistries.
craft-powered versions (5-pin XLR, 6-pin, 8-pin) batteries are not
required for operation if aircraft power is available.
ol module, observing proper
.
. Do not use any other
Connecting the headset to the aircraft
The headset can be configured to either plug into aircraft power or rely entirely on
battery power.
Using the 6-pin plug
A single 6-pin plug inserted into the 6-pin connector provides the headset with
aircraft power and intercom audio.
If your headset is aircraft-powered, a 6-pin connector may be installed and mounted to an aircraft panel. See “Mounting the aircraft panel connector” on page 35.
Note: An adapter is available from Bose to convert a 6-pin connector to a dual G/A
or U174 plug for additional connection flexibility for users who fly multiple
aircraft and require other connector types.
To connect the headset
Align the 6-pin plug to the connector keyway by matching the narrow bar on the
plug to the slot on the connector.
Firmly press the plug into the connector jack.
Align keyway
Push plug in
English - 13
Preparing the Headset for Use
To disconnect the headset
1. Pull back on the sleeve near the end of the 6-pin plug.
Gently continue pulling back to r
2.
Caution:
Pull sleeve back, then pull plug out
Do not pull the connector out without first pulling back the sleev
Forcing the connector out will damage the cable and/or the aircraft
instrument panel.
Sleeve
emove the plug from the connector.
e.
Using the dual general aviation plugs
The most common battery powered (only) version of the headset has two general
aviation (G/A) plugs that connect to the aircraft audio. Although the plugs look
similar, the microphone plug is shorter, thinner, and has a slightly different shape
than the intercom plug.
Insert the thicker intercom plug in first. It will only fit into one of the jacks.
Then insert the thinner microphone plug into the other jack.
Microphone
Intercom/Audio
Using other plug types
The headset is also available with other types of plugs for connecting to various
aircraft audio jacks. These single-plug connectors should be inserted into the appropriate jack on your aircraft control panel. Refer to “Power and cable variations”
on page 9.
14 - English
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