Picture of product C406-1HM

Part #:

Model: C406-1HM




ELT (406 MHz) - Single Frequency - Helicopter Model

Part Number :

  • Helicopter Model with 6-Axis G-Switch 
  • 406 MHz Emergency Locator Transmitter
  • Designed for commercial, business and military aviation requirements
  • Operating on 406, 121.5 & 243.0 MHz frequencies
  • Mounting tray bolt hole location compatible with most Artex two-frequency ELTs
  • Immediate search & rescue response upon complete registration
  • TSO C91a, TSO C126, ETSO 2C126, TSO C142 (lithium battery), COSPASS/SARSAT approved
  • Transport Canada approved
  • Worldwide coverage
  • Single RF output to tri-frequency antennas
  • Optional ELT to NAV interface transmits latitude & longitude of aircraft position with 100 meter accuracy
  • Optional dongle DGL-I provides auto-programming convenience for fleet operators
  • Automatically activates during a crash and transmits the standard sweep tone on 121.5 and 243.0 MHz
  • Every 50 seconds for 520 milliseconds (long message protocol) the 406.025 MHz transmitter turns on and transmits an encoded digital message to the Compas/Sarsat satellite system

In order to ship hazardous materials (HAZMAT) the shipper must have HAZMAT certified personnel. SEA will provide HAZMAT paperwork along with proper packaging and labeling for shipments directly to our customers.  If the shipment must be sent to another location such as a freight forwarder, SEA will provide the HAZMAT paperwork to the original ship to address only. Please contact your freight forwarder prior to ordering to verify that they are HAZMAT certified.  SEA is not responsible for issues that arise if your freight forwarder does not have HAZMAT qualified personnel.

Operating Frequencies: 406.025 MHz ± 2 kHz Biphase L (16K0GID), 121.5 & 243.0 MHz ± 0.005% (A3X) Output Power: 406 MHz: 5W ± 2dB (520ms/50sec) for 24 hours @ -20°C 121.5/243.0MHz: 100mW min (+20dBm) for 50 hours @ -20°C
Output Connector: BNC Female (121.5/243.0 & 406MHz)  Activation: Automatic by 4.5ft/sec G-Switch or Manual
Battery: 5 year Lithium Temperature: Operating: -20°C to +55°C Storage: -55°C to +85°C
Self Test: G-Switch enabled 406MHz Power Antenna/Coax Connection Position Data Present Low Battery Remote Control: ON/OFF/RESET
Antenna: Rod (110-338)(<350KTS) Blade (110-340)(<600KTS) Mounting Hardware: Mounting Tray P/N: 452-5050 Protective Top Cover P/N: 452-3052 End Cap P/N: 452-5052
Other Parts:  Coax cable Buzzer (to alert ground crew of accidental activation) Weight: ELT Transmitter: 3lb 5.8oz Max Mounting Tray: 7 oz Protective Top Cover: 6.7oz End Cap: 3.8oz Total Weight: 4lb 11oz 
Measurements: ELT Transmitter with Mounting Hardware installed: 11.74"L x 3.9"H x 3.82"W    
P/N: Model: C406-1 ELT Description:
453-5002 C406-1 Transmitter Only (Main Assembly)
453-5003 C406-1HM Transmitter Only - Helicopter ELT (Main Assembly)
455-5002 C406-1  ELT Base Pack List - contains transmitter & mounting hardware
455-5003 C406-1HM Helicopter ELT Base Pack List - contains transmitter & mounting hardware
455-5007 C406-1 Complete ELT System with Blade Antenna & NVG Remote (110-340)
455-5014 C406-1 Complete ELT System with Rod Antenna (110-338)
455-5015 C406-1  Complete ELT System with Blade Antenna (110-340)
455-5016 C406-1HM Complete Helicopter ELT System with Rod Antenna (110-338)
455-5017 C406-1HM Complete Helicopter ELT System with Blade Antenna (110-340)
455-5045 C406-1  Complete ELT System with Blade Antenna (110-341 - hi speed capacity)
455-5046* C406-1  Complete ELT System with Rod/Whip Combo Antenna (110-343)

* Please Note that the Attached "Pack Lists" are for REFERENCE ONLY & are subject to change.


- Emergency Locator Transmitter
Price Condition Status
- C406-1HM Base Pack List
Price Condition Status
- ELT (406 MHz) w/ 110-338 Antenna

NSN: 5821-01-552-2580

Price Condition Status

Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact questions@seaerospace.com

Turbojet-powered aircraft, part 91, US operations:

Starting January 1, 2004 an approved ELT must be installed. An ELT meeting TSO-C91 installed prior to June 21, 1995 is acceptable. An ELT installed after June 21, 1995 must meet TSO-C91a or TSO-C126.

No person may take off an airplane for flight over water more than 30 minutes flying time or 100 nautical miles from the nearest shore, whichever is less, unless it has on board the following survival equipment:
  1. A life preserver, equipped with an approved survivor locator light, for each occupant of the airplane.
  2. Enough liferafts (each equipped with an approved survival locator light) of a rated capacity and buoyancy to accommodate the occupants of the airplane.
  3. At least one pyrotechnic signaling device for each liferaft.
  4. One self-buoyant, water-resistant, portable emergency radio signaling device that is capable of transmission on the appropriate emergency frequency or frequencies and not dependent upon the airplane power supply (FAR Part 91.509 [b]).
  5. A lifeline stored in accordance with Sec. 25.1411(g) of this chapter.
Satellite alerting of the 121.5 Mhz distress signal will be discontinued after February 1, 2009.
An Artex ELT with a part number ending in -999 simply indicates that the unit is not programmed and is intended to be programmed via dongle (DGL-1) or wired into the ELT NAV interface (455-6500). Mostly only fleet operators and airlines request this programming ability to avoid reprogramming an ELT during routine maintenance should the ELT be replaced.

Most Artex ELT systems are received by distributors programmed with the ELT serial number for use in the USA. Thus the P/N ends in -366. If the ELT is programmed for another country, then the appropriate labels are placed on the ELT. However, the original dataplate part number remains the same. Dealer/distributors who are authorized to program Artex ELTs are not permitted to change the part number of the ELT.

Therefore, if someone requires an Artex ELT to actually have the -999 part number then this must be requested before the distributor places the order with the factory. Otherwise, programmed ELTs can be programmed with a default hex address and ID to be equivalent to the -999 status. When this is done by an authorized programming facility, the dataplate remains the same but the separate label with country and three digit code becomes blank and the hex ID label indicates the default hex ID.
It depends on the make and model of the ELT. However, most 406 ELTs have a battery life of either 4 or 5 years. Most batteries can transmit for as long as 24 hours.
Most commonly utilized by fleet operators, the DGL-1 programming dongle allows an ELT to be transferred between aircraft without having to reprogram or re-register. The Artex DGL-1 is mounted on the ELT cover (see picture). The DGL-1 is not a memory device that stores multiple ELT coding formats. Instead, the aircraft 24 bit address is coded into the dongle by setting a series of small dip switches. The switches are accessed by removing 4 screws that attach the dongle to the ELT top cover. Inside the dongle, there are two rows of 12 switches (see picture). These 24 switches are used to set the aircraft's 24 bit address by way of binary 1s and 0s. 1s are electrical ground, 0s are electrically open.

A few other notes regarding the DGL-1:
  • The connector between the DGL-1 and ELT is only compatible with the C406 and G406 series ELTs.
  • The DGL-1 switches do not have to be set by an approved Artex programming facility.
  • The 24 bit address programmed via the DGL-1 switches overwrites any other programming on an ELT once it is powered on.
After February 1st, 2009, Emergency Locator Transmitters (ELTs) operating on the 121.5 and 243 MHz will not be monitored by the COSPAS-SARSAT satellite system. There are many false distress signals and searches initiated each year with ELTs. The newer 406 MHz ELTs transmit unique aircraft information allowing authorities to contact an aircraft owner before a search is initiated. Therefore, 406 MHz significantly decrease the amount of unnecessary searches.

While 121.5 MHz is the international distress signal, it has limitations in relation to the search and rescue efforts that would follow the activation of this frequency by an ELT. Accuracy to a crash site of an aircraft with a 121 MHz ELT can be up to 20 miles. With the enhanced performance of the 406 MHz ELT and programmed aircraft information, accuracy is improved to 2 miles.

After February 2009, the 121/243 distress signals will only be detected by ground based receivers such as air traffic control, local airports, or other aircraft. Therefore, the search and rescue efforts related to an aircraft with an older ELT could be limited and will take longer, especially in a remote location.

Some aircraft owners do not respond positively towards FAA mandates. The February 1st 2009 ELT date is not a deadline to comply with any sort of ELT mandate. As mentioned, this date only applies the discontinuance of 121/243 ELT monitoring by the COSPAS-SARSAT satellite system. Therefore, aircraft owners must decide what value to place on their safety and survival should they be put in an emergency situation where the ELT would be activated.
An STC is not required for most ELT installations. Usually, only a logbook entry is needed. However, you should contact your local FSDO or local aviation authority for exact clarification.
Programmed aircraft information is essential for search & rescue, should the ELT be activated. When activated, the ELT will transmit your identifier.

An Emergency Locator Transmitter (ELT) should be programmed with either the aircraft tail #, a serial #, or the aircraft operator designator. The aircraft information programmed is determined by your country's requirements. The information is sent to the government agency responsible for keeping the database of the country in which your aircraft is registered.

The ID is linked to your SAR database, containing valuable aircraft information: Type of Aircraft, Address of Owner, Telephone # of Owner, Aircraft Registration #, and Alternate Emergency Contact, etc.

Keeping this information up to date & accurate is a major concern of the Search & Rescue Centers. Without accurate information, valuable time may be lost in attempting to locate the owner of the aircraft.

Your ELT can easily be programmed by a certified repair station, such as Southeast Aerospace.

Contact Southeast Aerospace today for more information on ELT programming.
The 366 at the end of any Artex 406MHz ELT simply indicates that the unit is programmed for the USA serialized long message format. All Artex 406 ELTs (C406 and G406 series) except for the ME406 are shipped from Artex with the 366 programming unless you specify otherwise. For international applications, once the ELT is reprogrammed, the unit dataplate and box label is updated with the new programming information. An updated FAA Form 8130 is issued at this time as well.

Therefore, if you are searching for an Artex 406 ELT ending in the -366 such as 455-5015-[366], then you can use the base number (ex. 455-5015) in most cases.
COSPAS is an acronym for the Russian words "Cosmicheskaya Sistema Poiska Avariynyh Sudov" . These Russian words translate to "Space System for the Search of Vessels in Distress".
SARSAT is an acronym for "Search And Rescue Satellite-Aided Tracking". The SARSAT system was developed as a joint effort by the USA, Canada, and France.
Click here to view the ELT reference guide.
Click here to view the guidelines.

If a problem is detected in the ELT, the LED will produce a coded signal. The LED will flash in order of importance with approximately .5 to 1 second pulse between each coded signal if multiple errors are present. The coded signal and related problems are as follows:

  • 1 flash indicates a G-switch loop open failure
  • 3 flashes indicate a 406 MHz transmitter problem such as defective or unconnected coax, low power output or programming error
  • 5 flashes indicate no navigation data present for ELTs interfaced to a GPS nav interface unit. This error is most likely due to faulty interface wiring, improper programming, invalid navigation data caused by nav system not powered up or GPS nav interface unit (P/N 453-6500) not being present
  • 7 flashes indicate a battery problem. Usually this occurs when the battery usage time is over an hour. A bench test by an approved Artex service center can indicate how many times the ELT has been activated and for how long

Southeast Aerospace has full bench test and programming capabilities for all Artex (Cobham) ELTs. Please contact the SEA Service Dept for any ELT service questions.

Even though the battery pack expires 5 years from the date the ELT is shipped from Artex, there are other factors that take priority. The Artex manual states that the battery pack must be replaced with a new battery pack in the following situations:
  • After use in an emergency
  • After an inadvertent activation of unknown duration
  • When the total of all known transmission exceed 1 hour
  • On or before the battery replacement data as indicated on the battery label

If any of these conditions are met, the battery must be replaced.

Artex batteries contain a microchip that records total activation time and number of activation times. The ELT tester will show this information when the unit is tested.

You should check the local regulations of any place you plan to visit with your beacon. Some countries require you to have a radio license and some countries even have restrictions on the use of beacons. However, if it's a true emergency, then you should always activate your beacon.

A UIN is a Unique Identifier Number that is programmed into each beacon at the factory. The UIN number consists of 15 digit series of letters and numbers that make up the unique identity of the beacon. The UIN is on a white label on the exterior of the beacon. The UIN is also referred to as the Hex ID.

Emergency Locator Transmitters (ELTs) are distress radio beacons which transmit location information about aircraft directly to Search and Rescue (SAR) forces letting them know that the owner is in grave and imminent danger.

Virtually all 406 MHz beacons incorporate a self-test mode of operation. Standard Self-Tests of beacons usually involve pressing a button or lifting a lever on the beacon and holding it for a few seconds. This usually results in the beacon flashing an LED or Strobe and/or creating an audible sound that indicates that the internal circuitry of the beacon is functioning correctly. You should always carefully follow the beacon manufacturer's instructions when carrying out a self-test as it is possible to get false results or inadvertently trigger a false alarm if perform the self-test incorrectly. If the beacon fails, then you should contact the beacon manufacturer or an appointed service agents for further advice and instructions.

The only indication that new ACR/Artex ELTs have the upgraded G-switch as detailed in SB1000 is the "UPGRADED G-SWITCH" box on the identification plate.  Please see image for reference.


In relation to NE (New) parts, many OEMs change their prices and availability without any notice to dealers or the industry. Therefore, through the REQUEST or RFQ indication, we ask that customers contact us for the most accurate price and availability.

In relation to SV & OH parts, the used parts aftermarket in the aviation industry is not an infinite supply. It is a dynamic, constantly changing market that is significantly affected by and susceptible to highs and lows in supply and demand. Therefore, although we attempt to, at times, we are unable to predict the exact moment when an item may be available. Once again, through the REQUEST or RFQ indication on our website, we ask that customers contact us for the most current and accurate price and availability.

PLEASE NOTE - Publications are for Reference Only