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Aviation Flight Helmet Adapter with U174/U for Relm BK KNG & KNG2 Radios

Regular price


  • Connect your Relm BK KNG P two way radio to your aviation flight helmet.
  • Makes Aviation contractor communications easier and less expensive.
  • Compatible with David Clark H1060 Headsets and Gentex Helmets

What is the AVKNGFH9R Adapter?

The Aviation Flight Helmet Adapter allows for the connection of the nexus plug from the helicopter flight helmet to the side port of your Bendix King KNG handheld radio for easy and cost effective communications with aircraft on wildland fire incidents.  This adapter uses the PTT button on the Nexus plug to key up your handheld radio and communicate through the mic in your flight helmet.

Works with the following Bendix King Radios: 

  • KNG P150 and KNG P150 Command Series Radios
  • KNG P150S Series Radios
  • KNG P400 Series Radios
  • KNG P400S Series Radios

Is your Helmet Compatible?

The aviation flight helmet adapters are compatible with many helmets types that utilize a Nexus U-174 nexus connector. There are 2 common wiring standards for this connector. The 49er adapters use the Peltor wiring standard for this connector which is also compatible with NATO-UK (most civilian helicopter flight helmets in the US use this standard), however there are some flight helmets that use the NATO-US wiring standard for this connector.

This is a compatible connector type, but not when wired to US military standards; however, many companies wire this connector to the Peltor standard. Some companies will even wire this connector to either standard based on customer preference.  Double check with manufacturer to confirm the wiring of your flight helmet.

While we can help you determine which connector you have, it is impossible for us to know exactly which wiring configuration was used. While the vast majority of US civilian flight helmets are compatible, if you are still unsure, often you can find out from the manufacturer of your helmet which wiring standard your connector is. 

Frequently Asked Questions:

  1. What connector does this adapter use?
    Nexus PTT (M9177/5-1 U-94A/U)

  2. What wiring standard was the Nexus plug wired to?
    Our adapters are wired to Peltor or "Helicopter" standard.

  3. Will this work with a David Clark Headset?
    Yes as long as the Nexus plug is wired in the Peltor configuration and the mic is the low impedance (civilian) version. 

* Design based on Aviation Contract: ACS 988-3 Air Com NFES 5328 NIFC.

AVKNGFH9R, Aviation Flight Helmet Adapter with U174/U and PTT for RELM BK Radio KNG

Technical Details

Product Specifications

adapter type
Flight Helmet
replaces products

Customer Reviews

Based on 1 review
Best Value

We have been looking around for ways to connect our new KNG Radios with our flight helmets and found these. They work great and are not as expensive as other options that we have seen out there. Great Value