Automatic Fixed Helicopter Military ELT

Roanwell Emergency Beacon

Helicopter
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406 AFHM – Fixed Helicopter Military ELT

Designed for military helicopter applications, this omni-directional helicopter activation system provides reliable emergency transmission across 406.028, 121.5, and 243.0 MHz frequencies. The unit includes a transmitter, ANT-406T survival antenna, BB-14 mounting bracket, external rod antenna with cable, remote control monitor, connector kit, & battery pack. Finished in flat black for night vision compatibility, the system meets TSO-C91a and TSO-C126 certification standards.

 

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Why Choose EBC‑406 AFHM?

Built for demanding rotary-wing operations, the EBC-406 AFHM is engineered to deliver dependable performance in high-stress environments where reliability is crucial. Its rugged, sealed construction protects internal electronics from shock, vibration, and harsh environmental conditions, while the streamlined system architecture supports straightforward integration and long-term durability in military aircraft. Designed with operational readiness in mind, it provides crews with a trusted emergency locator solution that helps support rapid search-and-rescue response when it matters most.

Serial number: EBC 406 HM

Physical features:

  • Size (ELT): 2.9" W x 2.5" D x 6.7" H
  • Total Weight: 2.5 lbs. (including battery, but not antennas, cable or remote control monitor)
  • Case Material: Aluminum
  • Finish: Black Baked Enamel

Special features:

  • Encapsulated for waterproofness and shock resistance
  • Handhold lanyard
  • Mounting bracket with latch to hold the ELT securely in place
  • Self-test feature with audible and visual indication of pass or fail
  • Fire resistant
  • Easy installation in cabin
  • Recessed 3-position toggle switch
  • True 360˚ spherical G-switch
  • 2-year parts and labor warranty

Specifications:

  • Operating Frequencies: 406.028 MHz, 243.0 MHz, and 121.5 MHz
  • Modulation 406.028 MHz: Biphase L (16KOG1D)
  • Modulation 121.500 MHz: Swept tone 1600 Hz to 300 Hz, 2-4 times/second
  • Output Power on 406.028 MHz: 5W for 24 hours at -20˚C
  • Output Power on 121.500 MHz: 50 mW min for 50 hours at -20˚C
  • Operating Temperature: -20˚C to +55˚C
  • Battery Type: Lithium Manganese Dioxide (GS-46 Battery Pack)
  • Useful Battery Life: 5 years or 1 hour of cumulative use
  • Automatic Activation: Velocity change of 3.5 ft/sec activates ELT
  • Altitude: 50,000 ft
  • Decompression: 8000 ft to 50,000 ft
  • Over Pressure: -15,000 ft
  • Humidity: 95% for 144 hours
  • Shock Performance: 500 Gs on 6 Axis for 4ms, 100 Gs on 6 Axis for 100ms
  • Vibration: Withstands 10 Gs
  • Immersion: Withstands 24 hours in salt water
  • Message Protocols: Aviation User Protocol, Serialized Aviation User Protocol
  • Activation Alerts: LED and buzzer
  • Input Power: No Aircraft Power Required

  • Note: Distress signals on 121.5 or 243.0 MHz are legal but processing of the signals by Search and Rescue personnel was discontinued in 2009.

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