Bailey Moyes 912 Dragonfly, Руководство по обслуживанию

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4. ELT Self Test: (does not apply to AK-450)
Place the main switch position from “OFF” to “ARM.” The buzzer sounds, and the 2
ELT Green “ON” lights (Red Light for AK-450) shall illuminate for 4 seconds, then extinguish. After 25 seconds, a
406 MHz test signal is transmitted. However it is specially coded as a “self-test” signal that is ignored by the
COSPAS-SARSAT satellites.
Verify that both the ELT Green “ON” lights (Red Light for AK-450) (located on the ELT Main Unit and the ELT
Remote Unit) must remain extinguished and no buzzer sound after 25 seconds. Verify Audio ELT Sweep Tone is
silent on the Com Receiver.
Activate the ELT using applied force. The direction forward force activation is indicated on the ELT. The AK-451-
(AF) (AP) ELT can be activated by using a rapid forward (throwing) motion coupled by a rapid reversing action.
Verify that the ELT has been activated by use of the Wattmeter, the Airplane’s VHF Radio Communications
Receiver when tuned to 121.5 MHz, or other means (see Note 1). The ELT must then be reset by pressing either the
RESET push button located on the ELT main unit or the ELT Remote Unit.
Note 1: This is not a measured check. It only indicates that the G-Switch is working.
Detail Test Procedure for ELT ID Programming and Self Test: (No Self Test on AK-450)
Turn the main switch from the “OFF” position to the “ARM” position. The Buzzer sound and the 2 Green ON lights
(Red Light for AK-450) 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.
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.
6 Antenna Check:
A low quality AM Broadcast Radio Receiver or Equivalent Test Equipment should be used to determine if energy
is being transmitted from the Antenna. When the Antenna of this Radio (tuning dial on any setting) is held
about 6 inches from the activated ELT Antenna, the ELT Aural tone will be heard (see note below). The ELT must
be reset by pressing either the RESET push button located on the ELT Main unit or the ELT Remote Unit.
Note: This is not a measured check, but it does provide confidence that the Antenna is radiating with sufficient
power to aid search and rescue. The Aircraft’s VHF Receiver, tuned to 121.5 MHz, may also be used. This
Receiver however is more sensitive and could pick up a weak signal even if the radiating ELT’s Antenna is
disconnected. Thus, it does not check the integrity of the ELT System or provide the same level of confidence as
does an AM Radio.
Appendix F Page 7