Ameri-King AK-451-ELT - Manual (Page 78)

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Note: The ELT may be ID coding programming during the aforementioned 20
seconds window period. If no programming happened the ELT will then enter
the Self Test Mode for 1 second thereafter.
Self Test takes 25 sec. Self-test results (after 25 seconds) are:
If the self-test is “Passed”: the Green ON light is steadily extinguished, and there’s
no buzzer sound. ELT swept Tone must be silent on the 121.5 MHz VHF Radio.
If the self-test is “Failed”: the Green ON light flashes as defined below:
1 flash: Internal Data stored in Memory at fault.
2 flashes: Distress ID stored in Memory at fault.
3 flashes: Battery voltage is low < Useful Life Battery Voltage setting.
4 flashes: Vcc supplies for F3, F2, or F1 at fault.
5 flashes: F3 RF power level < 33 dBm @ 406.028 MHz
7 flashes: F1/F2 VHF RF power level < 17 dBm @ 121.5/243 MHz.
9 flashes: PLL locked in F3 or F1 or F2 at fault.
Continuous flash: no F3/F2/F1 RF output power, ELT shuts down completely
Note:
The self-test mode that transmits a 406 MHz test code pulse monitors certain
system functions before returning to the ARM mode. The 406 MHz test
pulse is ignored by any satellite that receives the signal, but the ELT uses
this output to check output power and correct frequency.

Self-test is 520 ms long message burst on the 406 MHz signal. Synchronization
pattern is 011 010 000.

Self-test is then 121/243 MHz (VHF) Continuous Wave during 1s.

During Self Test, ELT swept Tone must be silent on the 121.5 MHz VHF
Radio.

If No Antenna or No coaxial cable connected, the ELT may or may not 5
flashes.
3.3.3
System Integration Test:
The test consists of turning the unit “ON” and then “resetting” it to verify that the
Transmitter, Latch Circuit, Batteries, and associated equipment are operating
properly. Regulations require that Transmitter tests only be done during the first 5
minutes of each hour and must not last for more than 3 Audio sweeps (1.5 seconds).
If you are at a location where there is an FAA Control Tower or other monitoring
facility, notify the facility before beginning the tests. Never activate the ELT while
airborne for any reason. See Figure 18 for the ELT Front Panels for both ELT
Main Unit and Remote Unit.