Bose A20 User Manual

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A20® AVIATIONHEADSET

Owner’s Guide

SAFETYINFORMATION

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 this equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Re-orientor 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 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.

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.

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.

Operate this product within the temperature range of 5°F to 131°F (-15°Cto 55°C) only.

Important Safety Instructions

Please read these instructions carefully and completely before using the headset.

Keep these instructions and 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® Aviation 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 longer durations can permanently damage your hearing.

Never repair or attempt to repair a defective headset yourself. Contact Bose® Technical Support. 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

batteries are incorrectly replaced.

Replace only with AA alkaline batteries. Do not use any other battery chemistries.

Batteries may cause a fire or chemical burn if mishandled. Do not recharge, disassemble, heat, or incinerate. Dispose of used batteries properly.

i

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

INTRODUCTION

4

What’s included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 What’s in the carton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Control module variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Power and cable variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7

PREPARING THEHEADSET FORUSE

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-pinplug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

Using the dual general aviation plugs . . . . . . . . . . . . . . . . . . . . . . . . . . .

12

Using other plug types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12

USING THEHEADSET

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Volume control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Power indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Auxiliary (AUX) audio input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Audio priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Using the headset with a Bluetooth®-enabledphone . . . . . . . . . . . . . . . . 19 Pairing the headset with your phone . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Bluetooth® volume control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Making and answering calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

22

ii

CONTENTS

HEADSETCARE ANDMAINTENANCE

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

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26

TROUBLESHOOTING

27

In case of difficulty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

27

INSTALLATION

31

Mounting the aircraft panel connector . . . . . . . . . . . . . . . . . . . . . . . . . . .

31

Details on making the connections . . . . . . . . . . . . . . . . . . . . . . . . . . . .

33

TECHNICALINFORMATION

34

SERVICE ANDWARRANTYINFORMATION

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

iii

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 mode.

Note: The headset includes redundant circuitry to reduce the effects of such failures and to allow for continued use of the headset in the passive noise reducing 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 mode is active when the headset control module is 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 battery source other than the Bose A20 Aviation Headset control module.

Note: In the unlikely event of a headset issue, we suggest that you switch to an alternate communications method and use standard cockpit resource management skills to minimize distractions.

1

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 mode turned off.

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 Cancelling mode turned off. In this 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 (such as 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® A20® Aviation Headset while operating any aircraft.

Using audio sources

When listening to in-flightentertainment, or a portable audio source through a Bose A20 Aviation Headset, be sure to limit the 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.

2

ADVISORIES

Headset earcup requirements

Proper headset operation requires that the headset TriPort® openings on the earcup are kept free of debris. The headset TriPort openings are located on the outside of each earcup and include two holes and a screen.

TriPort

opening

Microphone

opening

Earcup inner screen

The protective inner screen is critical to the headset’s performance.

Earcup

inner screen

Do not attempt to remove, replace, or repair this screen. If screen replacement seems necessary, contact Bose® Technical Support. See “Contact information” 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.

3

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 withBluetooth® wireless technology.

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-plugconfiguration depends on the options you chose for your headset.

There are two options for the control module:

Control module with Bluetooth wireless technology

Conventional control module

There are several end-plugconfigurations 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.

4

INTRODUCTION

What’s in the carton

Headset assembly:

Headphones

Clothing clip

Control module

See “Control module variations” on page 6 for options.

Second clothing clip

Cable connector (varies)

Accessories:

Carrying case

2 AA alkaline batteries*

3.5 mm adapter cable

Note: Cable connector types will vary based on model of headset. See “Power and cable variations” on page 7.

Note: *Replace batteries with alkaline batteries only. Do not use any other battery chemistries.

5

INTRODUCTION

Control module variations

If you opted for Bluetooth® wireless technology, you received the control module featuringBluetooth technology. If not, you received the conventional control module.

Bluetooth control module

Conventional control module

Left/Right volume controls*

Power indicator

Power button

Bluetooth indicator

Bluetooth

Bluetooth

function button

Volume Up button

 

Multifunction

 

Audio Priority

switch:

Bluetooth

switch:

Top

Volume Down button

Top

Intercom

 

Intercom

prioritized

Auxiliary (AUX)

prioritized

Middle

Middle

audio input

Intercom

Intercom

 

mixed

 

mixed

Bottom

 

Bottom

Intercom

 

Intercom

only

 

only

*Control the intercom volume

6

INTRODUCTION

Power and cable variations

The Bose® A20® Aviation Headset is available for purchase in different standard aircraft connector options, including:

Battery powered options

Dual powered options

Operate with battery power only

Operate with either aircraft or battery power

 

No battery needed when connected to aircraft power

 

 

Dual G/A

6-pin*

U174

5-pinXLR

U384

8-pin

 

 

*An adapter is available from Bose to convert a 6-pinconnector to a dual G/A or U174 plug for additional connection flexibility. Other configurations require the purchase of a cable assembly.

7

PREPARING THEHEADSET FORUSE

The microphone assembly

Your headset may be shipped with the microphone assembly (boom microphone and cable) attached to the left 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) 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 terminator cover 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.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.

L for left

Terminator Connector coverpins

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.

8

PREPARING THEHEADSET FORUSE

The battery compartment

The Bose® A20® Aviation Headset is shipped withfactory-setoperation 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.

Note: Foraircraft-poweredversions(5-pinXLR,6-pin,8-pin)batteries are not required for operation.

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 remain securely closed. You may need to use additional force when pressing down and releasing cover.

The operation switches

The operation switches control the Auto Off and Stereo/Mono functions.

Operation switches

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.

9

PREPARING THEHEADSET FORUSE

3.To change a switch position, use a pen or a small, flat-tippedscrewdriver to gently move the switch.

This table shows possible positions, default setting, and purpose for each switch.

Switch

Options

Purpose

 

 

 

 

1.

Auto Off

ON, OFF

Set at the factory to enable the Auto Off function. The headset

 

function

Default: ON

will turn off after 3 to 9 minutes of inactivity. To disable Auto

 

 

Off, set the switch to OFF. With the switch in OFF position, the

 

 

 

Acoustic Noise Cancelling® system will not turn off until you

 

 

 

press and hold the power button for at least one second.

 

 

 

 

2.

Mono/

Mono, Stereo

For most configurations, set at the factory for mono audio

 

Stereo

Default: MONO

systems (to provide audio in both ears). Set it to stereo (ST)

 

selection

if your aircraft has a stereo intercom.

 

 

 

 

Auto Off functionality

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 3 to 9 minutes after you stop using the headset.

When the headset is running on battery power only and is not plugged in to an intercom, it will shut off even when there is an auxiliary input present.

If you are on a phone call and unplugged from an intercom, the headset will allow you to complete your call, then it will turn off approximately three seconds after the call is terminated.

Note: To use the headset when unplugged from the intercom to listen to auxiliary input audio or as aBluetooth® wirelesstechnology-enabledheadset to make or receive calls, we recommend you disable the Auto Off feature for uninterrupted functionality.

Inserting and replacing the batteries

CAUTION: If the batteries do not fit correctly, do not force them in. Forcing an improper connection will cause permanent damage to the control module.

To insert or replace the batteries

1.Turn off headset power.

2.Press down firmly on the battery compartment cover and slide the cover to release. The battery door is tethered. Do not detach the door from module.

3.Insert the two supplied alkaline AA batteries into the control module, observing proper polarity.

4.Replace the battery compartment cover.

Note: Replace batteries with alkaline batteries only. Do not use any other battery chemistries.

10

PREPARING THEHEADSET FORUSE

Connecting the headset to the aircraft

The Bose® A20® Aviation Headset can be configured to either plug into aircraft power or rely entirely on battery power.

Using the 6-pinplug

A single 6-pinplug inserted into the6-pinconnector provides the headset with aircraft power and intercom audio.

If your headset is aircraft-powered,a6-pinconnector must be installed and mounted to an aircraft panel. See “Mounting the aircraft panel connector” on page 31.

Note: An adapter is available from Bose to convert a6-pinconnector to a dual G/A or U174 plug for additional connection flexibility.

To connect the headset

1.Align the 6-pinplug to the connector keyway by matching the narrow bar on the plug to the slot on the connector.

2.Firmly press the plug into the connector jack.

Align keyway

Push plug in

To disconnect the headset

1.Pull back on the sleeve near the end of the 6-pinplug.

2.Gently continue pulling back to remove the plug from the connector.

CAUTION: Do not pull the connector out without first pulling back the sleeve. Forcing the connector out will damage the cable and/or the aircraft instrument panel.

Pull sleeve back, then pull plug out

Sleeve

11

PREPARING THEHEADSET FORUSE

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 Bose® A20® Aviation Headset is also available with other types of plugs for connecting to various aircraft audio jacks. Thesesingle-plugconnectors should be inserted into the appropriate jack on your aircraft control panel. Refer to “Power and cable variations” on page 7.

12

USING THEHEADSET

Wearing and adjusting the headset

Proper fit on your head is important both for comfort and optimal noise reduction performance. Here are a few guidelines:

Use the left (L) and right (R) markings above the earcups to orient the headset properly.

R

L

As you put the headset on, lightly grasp each earcup and adjust it so its cushion is completely over your ear. You should feel an even, gentle pressure all around each ear.

Adjust the headband so it rests gently on top of your head.

Make your final adjustments with the headset powered on in a noisy environment.

In very loud conditions, such as during takeoff, you may experience a brief reduction in Acoustic Noise Cancelling® as the headset compensates for a momentary pressure change. If the problem continues when the sound level returns to normal, see “In case of difficulty” on page 27. If the problem persists, contact Bose® Technical Support for assistance.

Conditions related to fit

A low rumbling sound or frequent, brief losses of Acoustic Noise Cancelling noise reduction may indicate an improper fit or blocked earcup ports. See “Headset earcup openings” on page 23 for instructions on removing blockages.

During a long flight, you may feel a slight pressure point, which can be relieved by adjusting the headband position. Your experience with using the headset will help establish a sense of how it should sound and feel.

Microphone placement

Microphone placement is important for clear communications. With the headset on your head, make these adjustments:

13

USING THEHEADSET

1.Grasp the boom with your fingers and move the microphone up or down so it is level with your mouth.

2.Pull the microphone in toward your lips. Position the microphone with its talk side facing in. Though it will be slightly off center, the microphone should be 1/2 inch from the opening of your lips.

Mic label

Mic is too far away

Mic label is not facing

Mic is 1/2 inchmouth from mouth

3.Make sure the talk side of the microphone is facing your lips. Do not purse your lips.

Clothing clips

The control module cable is fitted with two clothing clips. Use the clips to attach the headset cable to your clothing, a safety harness, or an aircraft door pocket.

Press to open clip

Press to release and reposition clip along the cable

14

USING THEHEADSET

Using the control module

Use the control module to control the headset functions. There are two variations of the module; one featuring Bluetooth® wireless technology and one that has basic functions only.

Bluetooth control module

Conventional control module

 

Left/Right volume controls*

 

 

Power indicator

 

Bluetooth

Power button

 

 

 

indicator

 

 

Bluetooth

Bluetooth

 

function button

 

Volume Up button

 

 

 

Multifunction

 

Audio Priority

switch:

Bluetooth

switch:

Top

Volume Down button

Top

Intercom

 

Intercom

prioritized

 

prioritized

Middle

 

Middle

Intercom

 

Intercom

mixed

 

mixed

Bottom

 

Bottom

Intercom

 

Intercom

only

 

only

*Control the intercom volume

Power button

Use the power button to turn Acoustic Noise Cancelling® on or off, and control indicator brightness.

Press the power button once to turn on Acoustic Noise Cancelling noise reduction.

Press and hold the power button for 1-2seconds to turn off Acoustic Noise Cancelling noise reduction.

Note: Repeated pressing of the power button will not hasten the power off event. If the unit does not power off, wait 3 seconds and press the power button again.

15

USING THEHEADSET

Double-clickthe power button to dim the power andBluetooth® wireless technology indicators. To toggle the indicators between dim and bright, rapidly press the power button twice.

Volume control

The left and right volume control wheels on the control module adjust the volume of the corresponding earcup. With Acoustic Noise Cancelling® off, volume control will be set to the maximum level.

CAUTION: Avoid setting the volume levels too high. Exposure to loud sounds may cause hearing damage.

Holding the control module upright and facing you:

Use the left wheel to adjust volume of the left earcup.

Use the right wheel to adjust volume of the right earcup.

Overall headset volume control requires adjustments at both the aircraft intercom or radio and at the headset control module. Even at its lowest setting, neither volume control wheel can completely turn off the volume.

Power indicator

New alkaline AA batteries will generally supply at least 45 hours of power for the headset. Battery life varies with the ambient noise level of the aircraft, temperature, ear cushion condition, use of the Bluetooth feature, and age of the batteries. The power indicator changes color to indicate the power status, as follows:

Indicator color

Power source

Type of light

Indicates

 

 

 

 

Green

Aircraft

Slow flashing

Power ON

 

 

 

 

Green

Battery

Flashing

Power ON and batteries good

 

 

 

 

Amber

Battery

Fast flashing

Power ON, but batteries low

 

 

 

(8 hours or less remaining)

 

 

 

 

Red

Battery

Faster flashing

Power ON, but batteries very low*

 

 

 

(2 hours or less remaining)

 

 

 

 

Off

None

None

Power OFF or batteries depleted

 

 

 

 

Note: Replace batteries with alkaline batteries only. Do not use any other battery chemistries.

*Bluetooth wireless technology is disabled to conserve the remaining power once the battery reaches this level.

16

USING THEHEADSET

Auxiliary (AUX) audio input

The Bose® A20® Aviation Headset provides a1/8 inch (3.5 mm) AUX audio input that allows you to use your headset with an external audio source such as a portable GPS or a portable audio device. The connector is located at the bottom end of the control module as shown.

AUX audio input

Your headset includes a 1/8 inch (3.5 mm) adapter cable to connect your external audio device. Plug one end of the adapter cable into the headphone plug on your device and the opposite end into the headset AUX audio input.

Note: None of the functions of a connected audio source are controlled by the control module.

Note: This feature will not work unless the multifunction switch is turned on.

Note: When the headset is running on battery power only, and it is not plugged into an intercom, it will shut off even when there is an auxiliary audio input signal present. To use the headset when unplugged from the intercom to listen to auxiliary input audio or as aBluetooth® wireless technology headset to make or receive calls, we recommend you disable the Auto Off feature for uninterrupted functionality.

Audio priority

The Bose A20 Aviation Headset allows you to decide the priority of the audio sources you want to hear while using the headset. On the Bluetooth control module, the audio priority is controlled by the multifunction switch. On the conventional control module, the audio priority is controlled by the audio priority switch.

17

USING THEHEADSET

Multifunction/Audio priority switch

The multifunction/audio priority switch has three positions:

Position

Function

Operation

 

 

 

Top

Intercom prioritized

When the switch is in the top position and an

 

over AUX

intercom signal is detected, AUX audio is muted.

Middle

Intercom mixed with

When the switch is in the middle position and an

 

AUX

intercom signal is detected, AUX audio is mixed

 

 

with the intercom audio.

Bottom

Intercom only

When the switch is in the bottom position, only

 

 

intercom audio is active.

Note: On theBluetooth® control module, when aBluetooth wireless technology call is present, the audio from the call mutes the signal on the AUX audio input. In either the top or middle position of the multifunction switch, both the intercom and theBluetooth wireless technology signal are heard as mixed.

18

USING THEHEADSET

Using the headset

with a Bluetooth®-enabledphone

Pairing the headset with your phone

Pairing entails having the Bose A20® Aviation Headset in pairing mode, setting yourBluetooth-enabled phone to “discover” the headset, then confirming the connection on the phone. Before you use your Bose® A20 Aviation Headset with your mobile phone, you must pair the two devices.

1.Turn on the headset and make sure the multifunction switch is in the top or middle position, NOT in the emergency off position.

Power

Multifunction Switch

indicator light

 

Power button

 

 

 

 

 

 

 

 

 

Top position

Middle position

 

The power indicator light glows green or yellow, depending on the charge level of the battery. If the light is red, the battery is low and needs replacing.

2. Press theBluetooth function button (to activateBluetooth.

 

If this is the first time you’ve activated or are attempting

Bluetooth

to pair Bluetooth, theBluetooth indicator will flash at a

indicator

slow rate alternating with the Power indicator. This

 

indicates that the headset is in “discoverable” mode

 

and ready to be paired to a cell phone.

 

If the Bluetooth indicator does not flash alternately with the Power indicator flash or you are trying to pair a headset that has previously been paired with another phone, you will need to press and hold theBluetooth function button for 5 seconds in order to put the headset into “discoverable” mode.

3.With your Bluetooth-enabledphone turned on, locate the Bluetooth feature, usually under Tools, Connect, orBluetooth Devices. (Refer to the owner’s instructions that came with your phone for further details.)

4.Set the phone to “discover” or “add” a Bluetooth device. When Bose A20 appears in the list of devices, select and confirm this choice.

5.If you are asked for a passkey or PIN, enter the digits 0000.

The control module Bluetooth and power indicators flash together to confirm successful pairing.

If pairing is unsuccessful, repeat steps 3 - 5 above.

19

USING THEHEADSET

Note: The Bose A20® Aviation Headset will automatically exit pairing mode after five minutes of inactivity.

Bluetooth® indicator light status

The Bluetooth indicator is a blue light on the control module. It shows the status ofBluetooth functions, as follows:

Appearance

Indication

 

 

Flashes slowly, alternating with the power indicator.

Headset is discoverable or is pairing.

 

 

Flashes twice quickly with each power indicator

Bluetooth technology is ON but not

flash.

connected to a phone.

 

 

Flashes at the same rate with the power indicator

Bluetooth technology is ONand

(green or amber).

connected to phone.

 

 

Flashes once quickly with each power indicator flash.

Headset is in an active phone call.

 

 

No light

Bluetooth technology is not enabled.

 

 

Reconnecting to a previously connected phone

To reconnect the headset to a previously connected phone or other Bluetooth wireless technology device, briefly press theBluetooth function button on the headset control module.

The headset control module attempts to connect with the last connected Bluetooth wireless technology device.

Note: The Bose® A20® Aviation Headset can only be connected to oneBluetooth wireless technology device at a time. If you press theBluetooth function button on the headset control module for more than five seconds, the currently connectedBluetooth wireless technology device is disconnected and the control module enters pairing mode.

Recovering a lost connection

When a connected Bluetooth wireless technology device moves out of range and the connection is lost, the Bose A20 Aviation Headset automatically attempts to reconnect. If a connection still does not exist after five minutes, theBluetooth wireless technology receiver in the control module remains on, but not connected. TheBluetooth indicator on the Bose A20 Aviation Headset control module will exhibit a fast double flash initiated at each power indicator flash.

Disconnecting a Bluetooth technology-enabledphone

If you use a connected phone to end a Bluetooth wireless technology connection, theBluetooth technology receiver in the headset control module remains on, but no longer attempts to connect. ABluetooth wireless technology connection is ended by turning the phone off, ending the current call, or discontinuing the wireless connection.

20

USING THEHEADSET

If you turn the headset control module off, the control module Bluetooth wireless technology receiver also turns off, ending the connection to theBluetooth technology-enabledphone.

Bluetooth® volume control

The Bluetooth volume control increases or decreases the volume of the mobile phone that is paired to the Bose® A20® Aviation Headset. TheBluetooth volume control is located on the right side of the control module. You can only adjust theBluetooth technology volume during an active phone call. To change the volume, press the volume up or volume down button.

volume down volume up

Each time you press a Bluetooth volume button, the volume increases or decreases one level.

Note: Pressing and holding the volume button changes the volume continuously.

Note: WhenBluetooth wireless technology is active, you cannot mute the sound using theBluetooth volume buttons.

To clear pairing device history from the headset

With Bluetooth technology enabled and on (Bluetooth indicator light flashing) while not on a call, press and hold bothBluetooth volume up andBluetooth volume down buttons at the same time for 8 seconds. After 8 seconds, cycle theBluetooth power using the multifunction switch.

21

USING THEHEADSET

Making and answering calls

To make a call

Dial from your mobile phone, and the call will automatically transfer to the headset. If your phone has voice-activateddialing, press theBluetooth® function button and wait for the phone voice prompts.

To activate voice dialing (if your phone provides this feature)

When there are no active or incoming calls, briefly press the Bluetooth function button.

To answer a call

Briefly press the Bluetooth function button. You should hear a short beep in the headphones before you hear the incoming call.

To end a call

Briefly press the Bluetooth function button. You should hear two short beeps in the headphones to indicate that the call has been ended.

To reject an incoming call

Press the Bluetooth function button for three seconds.

Note: To avoid putting the control module into pairing mode, do not press theBluetooth function button for more than five seconds.

To redial the last number

When there are no active or incoming calls, press the Bluetooth function button twice in quick succession.

Note: Whether or not you can reject an incoming call, activate voice dialing, or redial the last number, depends on the capabilities of your phone. Please check your phone user guide for further details.

To transfer the audio to the mobile phone

When you are on a call, press the Bluetooth function button for three to four seconds. This transfers the audio to the mobile phone handset while theBluetooth wireless technology connection remains active.

Note: If you are on a call and unplugged from an intercom, the headset will allow you to complete your call, then it will turn off approximately three seconds after the call is terminated. To use the headset when unplugged from the intercom to listen to auxiliary input audio, or as a standaloneBluetooth technology headset to make or receive calls, we recommend you disable the Auto Off feature for uninterrupted functionality.

22

HEADSETCARE ANDMAINTENANCE

Instructions for continued airworthiness

Bose recommends following the general care and maintenance instructions in this guide. With normal use, items such as windscreens and ear cushions may require periodic replacement. If cleaning or replacement of these items is needed, follow the recommendations on the following pages. All other care and maintenance, in and out of the warranty period, must be performed by Bose or an authorized repair facility.

CAUTION: Do not immerse the headset in water or any other liquid. If the headset is immersed in liquid, do not use it. Contact Bose® Technical Support for assistance.

Cleaning the headset

General cleaning

Gently wipe the outside surfaces of the headband, connectors, plastic parts, and headband cushion, using a soft cloth moistened with water and mild soap. Take special care when cleaning the ear cushions and the outside surfaces of the earcups. Do not immerse ear cushions in water or any other liquid.

Headset earcup openings

The TriPort® headset opening and the microphone opening must remain clean and free of debris. Check to ensure that the openings on each earcup are clean before each flight.

TriPort headset opening

Microphone

opening

When wiping down the headset earcups, be sure not to force any dirt or debris into the openings. Carefully use tweezers, if necessary, to remove foreign matter that may be lodged in the openings. Do not blow air into or vacuum the openings as this may damage the headset.

23

HEADSETCARE ANDMAINTENANCE

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 hairdryer-typedevices to dry the inner screen.

Headband cushion

1.Remove the cushion as described in “Headband cushion replacement” on page 26.

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 37.

Microphone windscreen replacement

1.Roll the band that secures the windscreen off the tip of the microphone and dispose of it.

2.Gently slide the windscreen off the microphone.

3.Slide the replacement windscreen on and make sure it fits completely over the microphone.

4.Roll the new band onto the microphone tip, to about 1/4 inch from the end of the windscreen, to secure it.

24

HEADSETCARE ANDMAINTENANCE

Ear cushion replacement

As a general rule, ear cushions should be replaced every six months or every 350 hours of use, depending on how often you fly. You may have to replace them more often, if you:

Have a full beard or heavy whiskers.

Subject the headsets to severe temperature extremes such as parking your airplane outside in severe cold or heat.

Put excess strain on the cushions because of improper storage.

Indications that the ear cushions need replacing include:

Flaking of the outer covering.

Cuts or tears.

Flattening of the cushion, reducing the effectiveness of the seal.

To extend the life of the ear cushions, perform regular cleaning as described in “General cleaning” on page 23.

Replacing the ear cushions

1.Grasp the ear cushion skirt where it folds into the slot on the earcup.

2.Gently pull the ear cushion skirt up and away from the earcup.

3.Properly align the replacement ear cushion with the earcup.

4.Tuck an edge of the ear cushion skirt into the slot behind the ear cushion flange. Be careful not to fold the skirt over.

5.Gently stretch the cushion around the earcup, working the skirt into the slot as you go.

6.Grasp the ear cushion and adjust its position to remove any folds in the skirt and wrinkles in the cushion.

Battery replacement

Refer to “Inserting and replacing the batteries” on page 10.

25

HEADSETCARE ANDMAINTENANCE

Headband cushion replacement

The headband cushion is designed to give the maximum level of comfort to your headset.

Bose recommends that you replace the cushion after regular care and maintenance fails to restore the wool pile to its original size and shape.

To replace the cushion:

1.On a protected surface, turn the headset upside down. Remove the old cushion from the headband.

2.While still holding the headband open, align the center of the new cushion with the center of the headband and press firmly from the center toward the outside.

Headband cushion

Microphone assembly or access cover replacement

Replace the microphone assembly or connector access cover as described in “Attaching the microphone assembly” on page 8.

Storage

Store the headset in a ventilated area away from direct sunlight. Remove the batteries before storing the headset for extended periods.

26

TROUBLESHOOTING

In case of difficulty

Look for the problem in the left column of the table, then follow the “What to do” instructions in the right column. If the problem persists, contact Bose using the contact information on page 37 of this guide for assistance.

CAUTION: Do not attempt to disassemble or service the inside of the earcups or other parts of the headset. Only the boom microphone cable, access cover, batteries, windscreen, headband cushion, and ear cushions are replaceable by the user. For instructions on how to care for and maintain the headset, see “Headset Care and Maintenance” on page 23.

Noise Reduction

Problem

 

What to do

 

 

 

 

Communication,

 

• Make sure the headset is turned on.

but no Acoustic

 

• Press the power button to turn the headset on.

Noise Cancelling®

 

 

• Check the power indicator. See page 16 for a description of the

noise reduction in

 

either ear.

 

power indicator.

 

 

• If using aircraft power, check the aircraft fuse or circuit breaker.

 

 

• If using battery power, make sure the batteries are fresh and

 

 

correctly installed.

 

 

 

 

 

 

Note: Replace batteries with alkaline batteries only. Do not use any

 

 

other battery chemistries.

 

 

 

 

 

 

 

No active Acoustic

 

• Make sure the headphone plugs are securely inserted into the

Noise Cancelling

 

panel connectors.

noise reduction and

 

• Try using the headset in a different seat location.

no communication.

 

 

• Remove the microphone assembly from the headset and check

 

 

 

 

for damage to the connector or pins. See “The microphone

 

 

assembly” on page 8.

 

 

 

 

Communications

 

 

Problem

Acoustic Noise Cancelling noise reduction, but no incoming audio.

What to do

Check to see if the volume controls are set too low. See “Volume control” on page 16 for instructions on volume adjustment.

Check the volume setting of intercom/radio.

Make sure the headphone plugs are securely inserted into the panel connectors.

Try a different seat location in the aircraft.

27

TROUBLESHOOTING

 

 

Problem

What to do

 

 

Low volume of

• Check to see if the volume controls are set too low.

incoming

Refer to “Volume control” on page 16 for instructions on

communications.

volume adjustment.

 

• Ensure that the stereo/mono switch is correctly set for your

 

intercom system.

 

• Check that all headsets sharing the intercom have the

 

stereo/mono switch in the correct position.

 

• Unplug all other headsets and see if the volume can be adjusted

 

to an acceptable level.

 

 

Intermittent

• Check that the connection to the aircraft panel is not loose.

communication.

• Try the headset in a different seat location.

 

 

 

Reduced volume in

• Check to see if the volume control is set too low.

one ear only.

Refer to “Volume control” on page 16 for instructions on

 

volume adjustment.

 

• Check the stereo/mono configuration switch.

 

Refer to “The operation switches” on page 9

 

 

No stereo

• If your aircraft has a mono audio system, verify that the

separation or

stereo/mono configuration switch is set to mono. Refer to “The

communications in

operation switches” on page 9. Depending on how your audio

one ear only.

jacks are wired, there may be only one channel of audio supplied

 

to the headphone jack. If the stereo/mono switch is set to stereo

 

and you only hear communications on one side, setting the

 

switch to mono plays audio on both sides.

 

 

Audio

Problem

What to do

 

 

Reduced Acoustic

• Check the TriPort® headset openings on the outside of each

Noise Cancelling®

earcup to ensure that they are not blocked. If dust or dirt is

noise reduction,

present, carefully remove the debris using tweezers. Do not

intermittent clicking

vacuum or blow out debris.

sounds, or

• Make sure there are no air gaps around the ear cushion seals.

communication

distortion in a loud

If ear cushions appear worn, they should be replaced. Refer to

environment.

“Ear cushion replacement” on page 25.

 

 

Squealing or

• Ensure the headset orientation is correct. Use the Left (L) and

whistling sound

Right (R) markings above the earcups to orient the

when the headset is

headset correctly.

turned on.

• Inspect the seal between the ear cushion skirt and the earcup.

 

 

The skirt should fit into the slot on the earcup with no gaps.

 

Replace any cushions that appear to be worn out.

 

• Adjust the earcup fit to create a better seal on your head.

 

The headset’s low-forcedesign makes it sensitive to items that

 

interfere with the seal around your ear. Make sure your ears are

 

completely inside the ear cushions, and that a hat or eyeglasses

 

with thick temples do not interfere with the seal.

 

 

28

 

TROUBLESHOOTING

 

 

 

 

Problem

What to do

 

 

Low rumbling

• Adjust the earcup fit to create a better seal on your head. The

sound with the

low-forcedesign of the headset makes it sensitive to items that

headset turned on

interfere with the seal around your ear. Make sure your ears are

in a quiet

completely inside the ear cushions, and that a hat or eyeglasses

environment.

with thick temples do not interfere with the seal.

 

 

• Check ports at the outside surface of each earcup to ensure that

 

they are not blocked. If dust or dirt is present, carefully remove

 

the debris using tweezers. Do not blow out or vacuum debris.

 

• Inspect the seal between the ear cushion skirt and the earcup.

 

The skirt should fit into the slot on the earcup with no gaps.

 

Replace any cushions that appear to be worn out.

 

 

Crackling sound

• Ensure the headset orientation is correct. Use the Left (L) and

audible with

Right (R) markings above the earcups to orient the headset

headset turned on

correctly.

in a loud

• Adjust the earcup fit. Refer to “Wearing and adjusting the head-

environment, or

set” on page 13.

Acoustic Noise

Cancelling® noise

• If your headset is battery-powered,check to see if the battery is

reduction is

low (indicated by fast blinking red LED).

intermittent.

• If your headset is aircraft powered, make sure the voltage

 

 

powering the headset is no less than 10 VDC.

 

• Inspect the seal between the ear cushion skirt and the earcup.

 

The skirt should fit into the slot on the earcup with no gaps.

 

Replace any cushions that have surface tears, torn stitching

 

joints, large wrinkles, or have become dried and stiff.

 

 

Auxiliary audio input

 

 

Problem

What to do

 

 

No audio from

• Turn source volume up.

auxiliary source.

• Try another source with the headset to eliminate the source as

 

 

the possible problem.

 

• Make sure multifunction switch is not set to the bottom (intercom

 

only) position. The multifunction switch must be either in the top

 

or middle position for audio from an auxiliary input to be enabled.

 

• Check the connection between the auxiliary source and the

 

control module. Both ends of the AUX IN connector cable must

 

be properly seated inside the sockets.

 

• If the multifunction switch is set to the prioritized position (top),

 

the auxiliary audio source will not be heard if there is an audio

 

signal from the intercom.

 

 

Audio in one ear

• Check the connection between the auxiliary source and the

only from the

module. Both ends of the AUX IN connector cable must be

auxiliary input.

properly seated inside the sockets.

 

• Make sure the earcup cover on the headset is in place and

 

properly connected. Refer to “Attaching the microphone

 

assembly” on page 8.

 

 

29

TROUBLESHOOTING

 

 

Problem

What to do

 

 

Cannot hear

• Check headset prioritization settings. Refer to “Multifunction/

communications

Audio priority switch” on page 18.

while listening to

• Make sure all connections are secure (headset to intercom, AUX

audio from AUX

input to headset).

input or AUX input

• Communications audio is not present unless the headset is

does not mute with

incoming

connected to an intercom system.

communications.

 

 

 

Bluetooth® wireless technology

Problem

 

What to do

 

 

 

 

No audio to the

 

• Check to make sure the headset and phone are paired, the multi-

headset while on a

 

function switch is in the top or middle position, and the devices

call.

 

are communicating with each other.

 

 

• Make sure the phone and headset are in range of the Bluetooth

 

 

wireless technology (no more than 30 feet from each other).

 

• Make sure the volume of the Bluetooth wireless technology is

 

 

turned up on the control module.

 

 

 

 

 

 

Note: On initialstart-up,a20-seconddelay may occur before audio

 

 

can be heard.

 

 

 

 

 

 

 

The headset is not

 

• Turn the headset off, then on again.

pairing with my

 

• Follow your phone instructions to remove all devices previously

phone.

 

 

paired with your phone.

 

 

 

 

• Repeat the steps for pairing the headset with your phone. Refer

 

 

to “Pairing the headset with your phone” on page 19.

 

 

 

I cannot answer/end

 

• Make sure your phone is properly paired and connected to the

a call.

 

headset. Refer to “Making and answering calls” on page 22.

 

 

 

The headset does

 

• Make sure the phone has Bluetooth wireless technology enabled.

not reconnect to

 

• Turn the multifunction switch on to the top or middle positions.

my phone when I

 

 

• Press the Bluetooth function button.

turn it on.

 

 

 

 

 

 

 

 

Auto off

Problem

Headset does not shut off automatically.

What to do

In the battery compartment, make sure Switch #1 is set to ON (default).

Refer to “The operation switches” on page 9 for details on Auto Off functionality.

It may take up to nine (9) minutes for the headset to shut off when not in use immediately after initial power up.

30

INSTALLATION

Mounting the aircraft panel connector

The aircraft panel connector is part of the optional 6-pinwiring harness assembly.

Visit Bose.com or Global.Bose.com for information or purchase.

CAUTION: The aircraft panel connector must be mounted by a technician who is qualified to perform this type of avionics installation for the aircraft you are using.

Mount the connector into a cutout, using the diagrams below as a guide.

12.5mm

.49"

AIRCRAFT INTERFACE SCHEMATIC

14.0mm

RED

 

1

V+IN

BLK

 

.55"

BLK/WH

2

GND

 

WHT

 

3

COMM L

 

BLU

 

 

 

4 COMM R

RECEPTACLE - PINOUT (FRONT VIEW)

WHT

 

 

5

MIC HI

 

WH/BLU

Pin 6

6

MIC LO

 

 

BLK/WH

 

 

 

 

 

Pin 1

Connect the eight wires as follows:

Two for the microphone

Two for audio

One for power

One for ground

Two for audio shields

Audio and microphone wires should be connected to the back of the existing microphone and headphone jacks, leaving existing jacks intact for use with conventional headsets. This is usually the fastest installation method.

31

INSTALLATION

CAUTION: Do not use excessive force or bend the installed connector. This may damage or break internal solder joints.

Note: The aircraft panel connector cannot be installed in an audio system usingtransformer-coupledaudio outputs. Contact the Bose® Technical Support, using the contact information on page 37 of this guide for details.

Mono connection diagram

Existing wiring to aircraft intercom/ audio panel

10-32

1/2A

RED

 

1V+IN

 

V DC

BLK

 

 

BLK/WH

2 GND

 

 

 

WHT

 

 

 

3 COMM L

 

 

 

BLU

 

 

 

 

 

4 COMM R

 

 

 

WHT

 

 

 

 

 

5 MIC HI

 

 

 

WHT/BLU

 

 

 

 

 

6 MIC LO

 

 

 

 

BLK/WH

 

 

 

 

 

 

 

 

 

 

Ring

 

 

 

Microphone - Jack

(audio)

 

 

TPP

 

Barrel

Existing PTT

 

 

 

switch

 

 

(PTT)

 

(gnd)

 

 

 

and wiring

 

 

 

 

 

 

 

 

 

(no connection to

 

 

 

 

Bose headset)

 

 

Headphone - Jack

 

 

 

Tip

 

Barrel

 

 

(phone audio)

 

(audio gnd)

 

Stereo connection diagram

 

 

 

 

10-32

1/2A

RED

 

1V+IN

 

V DC

BLK

 

 

 

 

2 GND

 

 

 

BLK/WH

 

 

 

 

 

 

 

WHT

3 COMM L

 

 

 

 

 

 

 

 

 

 

 

 

BLU

 

4 COMM R

 

 

 

WHT

 

 

 

 

 

5 MIC HI

 

 

 

WHT/BLU

 

 

 

6 MIC LO

 

 

 

 

BLK/WH

 

 

 

 

 

 

 

 

 

 

Audio

 

 

 

Microphone - Jack

 

 

 

 

TPP

 

Barrel

Existing

 

 

(PTT)

 

(gnd)

PTT switch

 

 

 

 

 

and wiring

 

 

 

 

 

(no connection to

 

 

 

 

 

Bose headset)

 

Phone

 

Stereo Headphone - Jack

 

Existing wiring to

audio (right)

 

 

 

 

aircraft stereo

 

 

 

 

 

intercom/audio panel

 

 

 

Barrel

 

 

 

 

 

 

 

Tip

 

(audio gnd)

 

(phone audio left)

 

 

 

32

INSTALLATION

Helicopter (U174) connection diagram

WHT/BLU

6 MIC LO

 

WHT

5

MIC HI

 

BLU

 

4

COMM R

 

WHT

 

3

COMM L

 

BLK

 

2

GND

10-32RED

1

V+IN

V DC

1/2A

 

 

Existing single 4-

 

prong jack

 

Existing wiring to

 

 

Barrel

helicopter intercom/

 

 

 

 

(audio gnd)

audio panel

 

 

 

 

 

Note: Barrel ground (gnd) refers to aircraft grounds.

Details on making the connections

The pinouts for the optional installed connector are detailed in the table below:

Pin number

Color

Purpose

 

 

 

1

Red

V+IN: Headset power (10-32VDC). Use a1/4 amp fuse or

 

 

a 1/2 amp circuit breaker.

 

 

 

2

Black

GND: System ground. Connect to the existing audio ground.

 

 

 

3

White

COMM L: Phone communication: Left.

 

 

 

4

Blue

COMM R: Phone communication: Right.

 

 

 

Note: For stereo operation, connect the left and right channels to their respective positions. For monaural operation, connect pins 3 and 4 together, and to the tip of the existing phone jack.

5

White

MIC HI: Microphone/Hi-audio.Connect to the portion of the

 

 

existing microphone jack that corresponds to the ring

 

 

position of a headset microphone plug. Do not connect to

 

 

the tip (PTT) segment.

 

 

 

6

White/

MIC LO: Microphone/Lo-ground.Connect to the portion of

 

Blue

the microphone jack that corresponds to the barrel position

 

 

of a headset microphone plug.

 

 

 

Note: If the microphone works on radio transmit but not through the intercom, check pin 6. It may be incorrectly wired to the PTT segment of the microphone jack.

Comm Shield

Black

Shield from Comm L and Comm R wire pair.

 

 

 

Mic Shield

Black

Shield from Mic Hi and Mic Lo wire pair.

 

 

 

Note: The wires connecting pins 3 and 4 and pins 5 and 6 are shielded, twisted pairs with a black wire shield termination exiting each pair. If the existing wiring is not shielded, connect the shields to the existing audio wiring shields, or connect the shield from Comm L and Comm R wire pair to audio ground.

33

TECHNICALINFORMATION

 

 

Headphone

Damage could occur to avionics equipment that is

 

intended for use only with 600 Ohm headsets. If in doubt,

 

consult the avionics equipment manufacturer.

 

 

Impedance

Monaural mode: 160 Ohms ON and OFF

 

Stereo mode: 320 Ohms ON and OFF

 

 

Frequency response

15 Hz to 15 kHz

 

Sensitivity: 92 dB SPL typical, measured at 1 mw,

 

1 kHz, full volume on a KEMAR ear simulator.

 

 

Microphone (Electret)

Bias required: 8 to 16 VDC through 220 to 2200 Ohms.

 

Sensitivity: Varies depending on bias and AC radio input

 

impedance. Typical output is 600 mV at 114 dB SPL. To

 

assure proper modulation of the radio, it is recommended

 

that an avionics technician adjusts its input to match the

 

output of the microphone.

 

 

Microphone (Dynamic)

Impedance: 5 Ohm or 150 Ohm dynamic mic

 

Sensitivity: Equivalent to M-87/M-101

 

 

Maximum ambient noise level

115 dBC SPL for full active noise reduction performance

 

 

Power source

Battery-powered:Two (2) AA alkaline

 

Aircraft-powered:10 to 32 VDC

 

 

Voltage

Battery-powered:Two (2) AA alkaline batteries

 

Aircraft-powered:10 to 32 VDC

 

 

Battery life

Alkaline battery life: At least 45 hours in typical general

 

aviation aircraft noise. Duration varies with battery age,

 

ambient noise levels, temperature, ear cushion seal, and

 

use of the Bluetooth® feature.

 

 

Current

Operating: 25 mA in typical aircraft noise

 

 

Fuse/breaker recommended

1/4 amp,fast-blowfuse (AGC1/4 amp fuse) or1/2 amp

 

circuit breaker

 

 

Headset weight

12 ounces

 

 

Headset size range

Slider not extended:

 

8.425" (214mm) H x 6.34" (161mm) W x 3.15" (80mm) D

 

Slider extended:

 

10.2" (259mm) H x 6.6" (168mm) W x 3.15" (80mm) D

 

 

Control module dimensions

1.5" (38.1mm) H x 1.5" (38.1mm) W x 4.92" (125mm) D

 

 

Temperature and Altitude

Operating: 5 to 131°F (-15to 55°C)

(Category A)

Storage: -67to 158°F(-55to 70°C)

 

Altitude: 15,000 feet maximum pressure altitude for

 

full cancellation

 

 

Bluetoothwireless technology

Hands-freeprofile,Bluetooth 2.1

 

 

Bluetooth technology QD ID

Bose® A20® Aviation Headset: B016487

 

 

34

TECHNICALINFORMATION

FAA Technical Standards Order

The Bose® A20® Aviation Headset, its interface, cables, and microphones are FAA approved to TSO C139. It has been designed to function in or withstand exposure to the following environmental conditions:

Condition

Category

 

 

Altitude and temperature

A1

 

 

Salt fog

S

 

 

AF conducted susceptibility

B

 

 

Humidity

B

 

 

Magnetic effect

Z

 

 

Power input

B

 

 

RF susceptibility

T

 

 

Temperature and altitude

A1

 

 

Vibration

S, R, and U

 

 

Voltage spike

A

 

 

Shock drop

12 times, 1 m onto concrete

 

 

Environmental categories cited refer to RTCA/DO-160FandRTCA/DO-214(March 2, 1993).

The conditions and tests required for TSO approval of this are minimum performance standards. It is the responsibility of those installing this article either on or within a specific type or class of aircraft to determine that the aircraft installation conditions are within the TSO standards. TSO articles must have separate approval for installation in aircraft. The article may be installed only if performed under 14 CFR part 43 or the applicable airworthiness requirements.

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.

Este equipamento opera em caráter secundário, isto é, não tem direito a proteção contra interferência prejudicial, mesmo de estações do mesmo tipo, e não pode causar interferência a sistemas operando em caráter primário.

Names and Contents of Toxic or Hazardous Substances or Elements

 

Toxic or Hazardous Substances and Elements

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Polybrominated

Part Name

Lead (Pb)

Mercury (Hg)

Cadmium (Cd)

Hexavalent (CR(VI))

Polybrominated Biphenyl (PBB)

diphenylether (PBDE)

 

 

 

 

 

 

 

Metal parts

X

0

0

0

0

0

 

 

 

 

 

 

 

Plastic parts

0

0

0

0

0

0

 

 

 

 

 

 

 

Speakers

X

0

0

0

0

0

 

 

 

 

 

 

 

Cables

X

0

0

0

0

0

O: Indicates that this toxic or hazardous substance contained in all of the homogeneous materials for this part is below the limit requirement in SJ/T 11363-2006.

X: Indicates that this toxic or hazardous substance contained in at least one of the homogeneous materials used for this part is above the limit requirement in SJ/T 11363-2006.

35

SERVICE ANDWARRANTYINFORMATION

Locating the headset serial number

Your Bose® A20® Aviation Headset is identified by a unique headset serial number located on the underside of the headband and underneath the headband cushion. Reference this serial number when you register your product or contact Bose for technical support.

Serial number

Headband cushion

Be sure to properly reseat the headband cushion by pressing down firmly. For more information on replacing the headband cushion, see Refer to “Headband cushion replacement” on page 26.

Warranty

Details of the limited warranty are provided on the warranty/product registration card included in the product carton.

Limited warranty service

To return your headset to Bose for repair

Return your headset using the following procedures:

1.Contact the Bose organization in your country/region (visit Global.Bose.com for Bose contact information in your country/region) for specific return and shipping instructions;

2.Label and ship the product, freight prepaid, to the address provided by the Bose organization in your country; and

3.Place any necessary return authorization number prominently on the outside of the carton. Cartons not bearing a return authorization number, where required, will be refused.

36

SERVICE ANDWARRANTYINFORMATION

Contact information

Contact Bose for:

Spare parts and accessories

Technical advice

Installation information

Warranty and repair information

In North America:

Bose® Technical Support

145 Pennsylvania Avenue Framingham, MA 01701-9168USA

TEL: 1-800-233-4416(US);508-879-7330,ext. 62006 (outside U.S.) FAX:1-508-766-5997

E-MAIL:aviationheadsetsupport@Bose.com

In Europe:

Noise Reduction Technology Group

Nijverheidstraat 8 NL-1135GE Edam

TEL: +31(0)299-390777

FAX: +31(0)299-390109

E-MAIL:aviation_europe@Bose.com

World Wide Web: www.Bose.com

Ordering parts and accessories

The following accessories and customer-replaceableparts can be purchased directly from Bose. See the contact information above.

Additional control module cable

-Specify: Bluetooth® technology or conventional module

-Specify: connector type

Ear cushion kit

Headband cushion kit

Carrying case

Microphone windscreen

Clothing clip

Earcup access cover

6-pinconnector to dual G/A plug cable adapter

6-pinconnector to U174 plug cable adapter

Service kit (includes ear cushion kit, microphone windscreen, and headband cushion kit)

Aircraft panel connector installation kit

Aircraft panel installation kit cover plate

37

SERVICE ANDWARRANTYINFORMATION

38

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.

39

©2012 Bose Corporation, The Mountain,

Framingham, MA 01701-9168USA

AM325453 Rev.07