ebc 406hm

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

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.


Product Manual

The EBC 406HM meets the special needs of those who use night vision equipment or who want a direct/drop-in replacement for our EBC 302HM or EBC 502HM models. These ELTs are painted a non-reflective flat black as are the transmitters they replace. They have an integral antenna, therefore no external antenna is needed. They are installed in the cabin and so a Remote Control Monitor is not necessary. To meet the needs of our military or governmental users these ELTs transmit on three frequencies: 406.028, 121.5 and 243.0 MHz.

A standard EBC406HM comes with a BB-12M bracket. For Apache helicopters there is another bracket – the BB-15M. Installation is easy because the EBC 406HM mounting bracket uses the same three-screw-hole configuration as our older models. Simply remove the older model ELT and mounting bracket and attach the new unit.

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

Intended for military or civilian governmental use it has been designed with
the newest technology. The EBC 406HM also 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

The EBC 406HM uses our proven omnidirectional activation system. This
system uses 2 omnidirectional switches mounted perpendicularly to each
other. Since each senses impact in 360˚ the total coverage is a true 360˚
multiaxis activation switch. The switches are connected to a timing circuit
so that only a crash, not a hard landing or vibration, will activate the unit.
False alarms are therefore eliminated.

A self-test feature is built into the EBC 406HM. 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 406HM 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 antenna)
  • Case Material: Aluminum
  • Finish: Flat Black Baked Enamel
  • Antenna: Survival/Poratble – Three frequency tape


  • 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


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.