ebc 406aphm

Quality compatibility are guaranteed with EBC’s accessories and replacement components.

Cabin or cockpit mounted military helicopter ELT transmits on three frequencies (406.028, 121.5 & 243.0MHz). Is painted flat black, uses an external rod antenna. Meets TSO-C91a and TSO-C126.

Product Manual

The EBC 406APHM cabin mounted ELT is for rotary wing military or governmental aircraft in which night vision equipment is used but where an external antenna is desired. These ELTs are painted a non-reflective flat black to be night vision compatible. The EBC 406APHM has an external rod antenna and so it can be installed anywhere in the cabin of the aircraft provided that the pilot can reach it in case of an emergency. Because it is within reach no Remote Control Monitor is necessary. To meet the needs of ourmilitary or governmental users these ELTs transmit on three frequencies: 406.028, 121.5 and 243.0MHz.

The system comes with a transmitter, survival tape antenna, mounting bracket, a battery pack and a rod antenna with a 6 ft. cable. If the ELT is activated a built-in monitor emits a loud beeping tone and the LED flashes. The survival antenna allows the ELT to transmit a good signal when used outside the aircraft.

Intended for military or civilian governmental use it has been designed with the newest technology. The EBC 406APHM incorporates the best and proven features that characterize all of EBC’s emergency locator transmitters. These transmitters have encapsulated electronics and battery packs to provide added protection against shock, moisture and other environmental hazards.

A self-test feature is built into the EBC 406APHM. This feature allows the pilot to test for output power on both 406.028 and 121.5 MHz, the connection with the antenna, and the condition of the digital signal.

The EBC 406APHM meets the requirements of TSO-C91a and TSO-C126, approved by COSPAS-SARSAT and meets FCC requirements under Part 87.


  • Size (ELT): 2.9″ W x 2.5″ D x 6.7″ H
  • Total Weight: 2.5 lbs. (including battery, but not antennas or cable)
  • Case Material: Aluminum
  • Finish: Black Baked Enamel
  • Antenna: External – Three frequency rod standard
  • Survival/Portable – Three frequency tape


  • 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
  • 2 year parts and labor warranty
  • True 360˚ spherical G-switch


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


*Disclaimer: Distress signals on 121.5 or 243.0 Mhz are legal but in 2009 processing of the signals by Search and Rescue personnel was discontinued.