3.3.24. ELT operation (AK-451-2)
The ELT automatically activates during a crash and transmits the standard swept tone.
The Green ON lights ashing located on both the ELT Main Unit and the Cockpit. Remote Switch unit and the buzzer
sound periodically indicates when the ELT is activated.
The ON switch on the Remote Switch Unit allows you to turn on the ELT for testing.
The RESET Switch on the Remote Switch Unit enables to reset the ELT. In normal operation, the Main Switch on the
ELT Unit must be selected at “ARM” position.
Do not allow test duration to exceed 5 seconds. A false alarm may be generated.
Any time the ELT is activated, it is transmitting a 121.5 MHz and 243.0 MHz distress signal. If the ELT operates for
approximately 50 seconds, a “live” 406 MHz distress signal is transmitted and is considered valid by the Cospas-
Sarsat satellite system. Any time that the ELT Main Switch is lifted and ipped from “OFF” to “ARM”, a 406 MHz self
test signal is transmitted (after 25 seconds), however it is specially coded as a “self test” signal that is ignored by the
COSPAS-SARSAT satellites. Note: Press RESET anytime to turn o unwanted transmission
In the event of a crash, the AK-451-2 activates automatically, and transmits the standard swept tone on 243/121.5
MHz lasting until battery power is gone. This 243/121.5 MHz signal is mainly used to pinpoint the beacon during
search and rescue operations.
If the ELT is accessible after the accident, place the Main Switch in the ON position and monitor it on 121.5 MHz for
proper operation if possible. If the Antenna is broken o of the ULL aircraft, the ELT Unit should be removed and
the portable antenna to be used. If the ELT Unit is to remain at the ULL aircraft site, it should be placed on a large
metallic portion of the airframe with its Antenna pointing skyward. The Green ON lights should be ashing after the
accident. If the ELT is to be taken along as the Portable Unit when leaving the scene of the accident, place the Main
switch in the ON position and keep the Antenna vertically oriented as much as possible. The ELT Green ON light
should be ashing.
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