ACK E-04 ELT Retrofit Kit


Out of stock

ACK E-04 ELT Retrofit Kit is a direct replacement for the model E-01 ELTs and transmits on 406 as well as 121.5 MHz. For increased accuracy, it can also accept NEMA 0183 GPS position data from Garmin and Bendix/King GPS.
The E-04 external antenna will utilize a current antenna mounting and wiring installation.
Part Number: E-04R Category:

ACK E-04 ELT Retrofit Kit

The E-04 is a 406 MHz/121.5 MHz ELT intended for use in general and commercial aviation and is a direct replacement for the E-01 ELT. This ELT fits the E-01 mounting trays, uses the same remote control panel indicator, and the E-04 external antenna can use the preexisting E-01 antenna mounting and wiring installation.

The E-04 activates in the event of a crash and transmits a homing signal on 121.5 MHz for 48 hours while simultaneously transmitting a distress signal on 406 MHz to the Cospas-Sarsat system for up to 24 hours. Additionally, this unit can be interfaced with an aircraft’s GPS system and is capable of accepting GPS position input data from several different devices. GPS information can then be sent to search and rescue, which results in drastically reduced search times. When activated, the E-04 provides an aural alert with a simple plug-in alert indicator.

What’s included?

  • 121.5 MHz / 406 MHz ELT (E-04)
  • Remote Horizontal placard (E-04.12.2)
  • Remote vertical placard (E-04.12.2)
  • Whip antenna (E-04.8)
  • Electrostatic discharger (E-
  • Audio alert (E-04.7)
  • Female 4 pin DIN plug (E-04.10.6)
  • Audio alert cable (E-04.10.3)
  • Switch cover (E-04.11.1)
  • Installation/Operation/Manual (E-04M)


  • Accepts GPS position input data from Bendix/King, Garmin, Nema 0183 GPS.
  • New antenna is swept back 20 degrees and features a molded plastic base.
  • 5-watts @ 406 MHz for 24 hours, and 100Mw @ 121.5MHz for 48 hours.
  • New simple plug-in audible alert indicator.
  • New lithium battery pack offers a 5-year battery life and makes it substantially lighter.
  • Can use Ameri-King remote panel indicator.

Additional information

Weight 1.6 lbs
Dimensions 7.75 × 2.85 × 2.85 in

ELT & battery pack: 1.6 lb
ELT Tray & straps: 0.2 lb
Remote control: 1.1 oz
Audio alert indicator: 1.5 oz
Antenna: 2.1 oz


121.5 MHz and 406 MHz

Power at Terminal (50Ω load)

121.5 MHz – 20.7 dBm 50 hr @ -20°C
406.037 MHz – 37.3 dBm 24.5 hr @ -20°C

Operating Temperature

-20°C to 55°C

Storage Temperature

-55°C to 85°C

Peak EIRP with E-04.8 whip antenna & E-04.10.4 coax cable

121.5 MHz – +23 dBm 200 mW
406.037 MHz – +39.79 dBm 13.7 W

Crash Activation

4.5 FpS ±0.5 FpS

ELT Approvals

FAA/Transport Canada
TSO C-126b TSO C-91a
ETSO 2C126 ETSO2C91a
Industry Canada 1863A-E04AF
Brazil ANAC

Battery Approvals

FAA/Transport Canada
TSO C-142a
ETSO C-142a
Brazil ANAC

Battery Life

5 yrs (when used with model E-04 ELT)

Battery Amp Hour Rating

7.75 Ah

Battery Type

Li-SO2, non-flammable electrolyte



E-04R ELT Retrofit Kit

ACK E-04 ELT Retrofit Kit