Ameri-King AK-451-ELT - Manual (Page 60)

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Detail Test Procedure for ELT ID Programming and Self Test:
Turn the main switch from the "OFF" position to the "ARM" position. The
Buzzer sound and the 2 Green ON lights shall illuminate for 4 seconds, then
extinguish. This is to allow coding programming during the next 20 seconds window
and self-test for 1 second thereafter.
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,) is:
If the self-test is passed, the Green ON light is steadily extinguished and
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.
2.4.5 ELT Self Test Schedule:
We recommend that the ELT be tested every month. Follow the steps outlined above.
Total allowable test is 60 minutes as determined by FAR 91.207 and RTCA DO-204.
After this time has been accumulated a 3-flash error may be presented after the self-
test. The battery must be replaced at this point for the ELT to remain in compliance.
Always follow ELT testing requirements per local or national authorities.