Military Helicopter ELT

Roanwell Emergency Beacon

Roanwell EBS Cat
Logo-6-small (1)

406 HM – Military Helicopter ELT

For military helicopter use. 720-degree spherical automatic activation. No external antenna or remote control monitor necessary. Transmits on 406.028, 121.5 & 243.0MHz. Painted flat black for night vision compatibility. Meets TSO-C91a and TSO-C126.

Request a Quote

Why Choose EBC‑406 HM?

The EBC‑406 HM is a military‑grade helicopter emergency locator transmitter featuring tri‑frequency transmission (406.028, 121.5 & 243.0 MHz), a true 360° spherical activation system, and a flat‑black, night‑vision‑compatible finish. With encapsulated electronics for rugged waterproof and shock‑resistant performance—and an integral antenna requiring no external hardware—it delivers reliable, automatic emergency signaling in the most demanding environments.

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 antenna)

  • Case Material: Aluminum

  • Finish: Flat Black Baked Enamel

Special features:

  • Encapsulated for complete waterproofing and shock resistance

  • Handhold lanyard

  • Mounting bracket with latch to securely hold ELT in place

  • Self-test feature with audible and visual indication of pass or fail

  • True 360˚ spherical G-Switch

  • Fire resistant

  • Installation is in cabin not the tail

  • Recessed 3-position toggle 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.

Related Products

Portable EB

Portable Emergency Locator Transmitter

LEARN MORE
Roanwell EBS Cat

Fixed Helicopter Emergency Locator Transmitter

LEARN MORE
Closeup female hand on landline phone in office. Faceless woman in a suit works as a receptionist answering the phone to customer calls

TALK TO AN EXPERT

We invite you to connect with us regarding any inquiries you may have about our services. With over 40 years of experience connecting OEMs and customers worldwide, we are committed to providing you with expert guidance and support. Your questions are important to us. Our seasoned team is dedicated to promptly addressing your concerns and ensuring you receive comprehensive information tailored to your requirements.