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Convert a Military Flight Helmet for Civilian General Aviation Aircraft Use

Several factors should be considered before choosing a communications setup when converting a Military Flight Helmet for Civilian General Aviation (G/A) Aircraft use. Military and civilian radios and intercoms operate on different impedances AND usually have different plug setups as well. Military aircraft use a single U-174 plug while most general aviation aircraft use a dual plug system. This means that military helicopter helmet cables are not directly compatible in civilian aircraft. The microphone and earphones also need to be converted. Some things to consider first before choosing a helmet configuration:

  Does the civilian aircraft have single or dual plug system? Most civilian impedance general aviation fixed wing aircraft use a dual plug system (one plug for microphone and one plug for earphones).

  Will the helmet ever need to operate in military aircraft in addition to civilian aircraft? If the helmet needs to remain compatible with both military and civilian impedance aircraft, then we recommend using an impedance converter/adapter.

  Will the helmet be used with a boom microphone, oxygen mask, either, or both? We have the parts available for any desired configuration. Please visit our flight helmet communications information page for more information.

  Will the helmet have standard civilian impedance earphones or will it have Active Noise Reduction (ANR) earphones? ANR earphones are more expensive but offer a much more enjoyable flying experience, especially in noisy war-bird aircraft. Please visit our flight helmet communications information page for more information.

Several quick and easy conversion methods for helmets that already have a helmet cord and boom microphone installed are listed below:


  Use an impedance converter and keep your existing microphone and earphones. This option is recommended if the helmet needs to remain compatible with both military and civilian impedance aircraft. Click here to purchase.

  If the helmet already has a helmet cord that is compatible with the aircraft, then replace your military impedance microphone and earphones with civilian impedance microphone and earphones. This option is recommended if the helmet only needs to operate in civilian impedance aircraft. This option may also be used in conjunction with the plug adapter cable below. Click here to purchase.

  If the helmet already has compatible earphones and microphone, then purchase a plug adapter cable. This option can be used in conjunction with the earphones/microphone replacement option above. Click here to purchase.

Please Note: Additional parts may be required for flight helmets that do not already have a helmet cable and boom microphone installed.

.For more information, please visit our Flight Helmet communications information page.

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