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Bose A20® ANR Aviation Headset - U174 Military Plug - Without Bluetooth

Now $1095.00/Each
Was $1195.00
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Part# 11-08731
MFR Model# 324843-W130


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**This model is battery powered, has a straight cord and single U-174 helicopter plug with the dynamic mic for military use. The military model does not come with the Bluetooth feature.**


Plug in. Turn on. Go flying.

The A20 Aviation Headset is engineered to be more comfortable and provide more noise reduction than any headset we’ve ever made, while still delivering the clear audio you expect from Bose. And now there are more features than ever, including: a Bluetooth audio and communications interface; customizable audio prioritization control; intuitive “plug-and-play” operation; a high-performance microphone and an optional coil cord. And at just 12 ounces, it’s still one of the lightest active noise cancelling headsets out there. No other headset offers this unique combination of features and benefits.
  • 30% greater active nose reduction than conventional aviation headsets
  • 30% less claming force than conventional aviation headsets
  • Clear audio with active equalization
  • Bluetooth audio and communications interface for connectivity with your communications and navigation devices*
  • Customizable audio prioritization controls lets you mute an audio signal when receiving a communication, or mix the two together
  • Simple, intuitive headset operation - plug it in, turn it on, go flying

Enjoy a peaceful,
comfortable flight

The A20 headset gives you 30% greater noise reduction than conventional aviation headsets, so you’ll enjoy a peaceful flight from short stops to long hauls. And at just 12 ounces, with sheepskin cushions and minimal clamping force, it’s one of the lightest and most comfortable aviation headsets you’ll find. All designed to let you focus on what matters—flying.


Clear audio for music and communication

Bose Active EQ keeps the audio clear and distinct, whether you’re listening to music or an important communication.
Simple, intuitive operation

Plug-and-play convenience means the headset is ready to fly when you are—no need to press a lot of buttons first just to activate it.


Enhance your experience

The ergonomic control module includes an auxiliary audio input with Intercom/AUX priority switching, ideal for dedicated GPS and traffic warning systems. It also features a customizable audio prioritization control with “mute” and “mix” settings, and flexible power circuitry with auto-on that switches to and from battery power and aircraft power. Select models also include Bluetooth connectivity for taking calls or listening to music.


For all types of aircraft

The A20 Aviation Headset is available in dual plug, 6-pin plug and U174 plug models and a variety of configurations designed for use in all types of general aviation aircraft, including helicopters.

* Features available in certain variants of the headset.

More features

  • Coil cord down-cable now available in select configurations
  • Certified to FAA TSO-C139 and EASA ETSO-C139
  • Adjustable powered microphone can be connected to either earcup and set in a range of stable positions for optimal communications
  • Smart shutoff helps provide at least 45 hours of use from just two AA alkaline batteries
  • Five-year transferable limited warranty covers parts, labor and second-day return shipping expenses for non-abuse malfunctions
  • Download the Bose A20 Manual (PDF)
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


  • Significantly improved noise reduction across a wider range of frequencies. Proprietary Bose innovations now use microphones both inside and outside each earcup to sense and reduce more ambient aircraft noise.
  • Redesigned ear cushions deliver greater comfort using new materials. More compact earcups now have a larger interior cavity, allowing more room for the ears; redistribution of headset weight also helps improve overall comfort and stability.
  • Enhanced center torsion spring on magnesium headband provides a consistent, comfortable fit for any size head with significantly less clamping force than most pilot headsets.
  • TriPort® acoustic headset structure, available only from Bose, produces tonally balanced audio from relatively small and lightweight headphones.
  • Active equalization electronically tunes the headphones' frequency response, enabling outstanding audio performance.
  • Adjustable powered microphone can be connected to either earcup and set in a range of stable positions for optimal communications.
  • Auxiliary audio input on redesigned control module for connection to GPS and other devices. Pushbutton Intercom/AUX enables priority switching
  • Bluetooth phone connectivity lets you take calls wirelessly through the headset.
  • Enhanced EMI protection to minimize communications interference.
  • Integrated sidetone for more natural sounding intercom and mobile communications.
  • Smart shutoff for extended battery life. Installed headsets also feature a flexible power system to automatically switch from aircraft power to battery power as needed.
  • Ergonomic control module has been redesigned for greater ease of use. Includes contoured grip and streamlined interface with high-contrast icons on main controls.
  • Custom carrying case helps protect headset during storage and transport.
  • TSO certified by FAA/JAA to meet performance standards for headsets used on civil aircraft. Made in the US, it also meets RTCA/DO-160D and DO-214 environmental requirements.
  • Five-year transferable limited warranty covers parts, labor and second-day return shipping expenses for non-abuse malfunctions.
  • Specs: 8.4" H x 6.3" W x 3.2" D (12 oz)

In The Box

  • A20® Aviation Headset
  • In-line clothing clip
  • Control module
  • 2 AA batteries
  • Aux-in cable adapter
  • Carrying case
  • Accessories
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We purchased for a customer and they are quite happy.

Tony G
January 17, 2020


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: I have the U174 version of the A20 and would like to convert it to GA dual plug using an adapter. Do I need to use an impedance adapter or just a normal helicopter to dual plug adapter? Is the A20 considered high or low impedance? Thanks

It depends on the model you have. If you have a U-174 helicopter version of the Bose A20, a standard converter, like part # 11-10650, will work fine. If you have the low impedance U-174 military Bose A20, you will need an adapter like part # 11-10645.

Q: Does this part no. 11-08731, Bose A20 headset with U-174 military plug come with the 5 ohm dynamic microphone?

Yes, this will come with the 5-ohm dynamic microphone used in military applications.

Q: Is part no. 11-08731, Bose A20 headset with U-174 plug the low impedance version?

Yes, part # 11-08731 is the low impedance version.

Q: 1.We operate low-impedance(ics) helicopters and high-impedance helicopters. 2.Where can I check (low-impedance and high-impedance) on the boss headset? 3.Do I need to use an impedance converter to use a20 (with Bluetooth) for low impedance helicopters? 4. Is a20(with Bluetooth) low impedance headset being produced?

Part # 11-08731 is a low impedance headset. Yes, if you want to use this headset in a high impedance environment, you would need a converter, like Part# 11-06531.

Q: Is the A20 headset with U174 military version (no Bluetooth) mono only or can be switched to stereo?

These headsets have a switch in the remote that allows to switch between mono and stereo applications.

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