Testing Emergency Locator Transmitter - Piper Navajo Chieftain PA-31-350 Service Manual

9.
Connect new battery pack terminals to the bottom of the circuit board.
10. Reinsert the control head section into the battery pack being careful not to pinch any wires,
and replace the four screws. If the four holes do not line up, rotate the battery pack 180 and reinsert.)
11. Slide the portable antenna back into the stowed position.
12. Place transmitter into its mounting bracket and fasten the strap latch.
13. Connect the antenna coaxial cable to the ELT and ensure that the contact separator is
inserted between the antenna contact finger and the portable antenna. (Ref. Fig. 12-8.)
14. Press RESET button and set ON/OFF/ARM switch to ARM.
15. Make an entry in the aircraft logbook, including the new battery expiration date.
16. A unit operational check may now be performed on the ELT. (Refer to Testing Emergency
Locator Transmitter, paragraph 12-8.)
NOTE
Inspect the external whip antenna for any damage. Avoid bending
the whip. Any sharply bent or kinked whip should be replaced.
Antenna damage may cause structural failure of whip in flight.
12-8. TESTING EMERGENCY LOCATOR TRANSMITTER. The transmitter operates on the emergency
frequencies of 121.5 and 243 MHz; both of these frequencies are monitored by the various FAA
installations. Before performing any operational test of the ELT, the following precautions should be
observed:
CAUTION
Testing of an ELT should be conducted in a screen room or metal
enclosure to ensure that electromagnetic energy is not radiated
during testing. If a shielded enclosure is not available, testing may
be performed in accordance with the following procedures:
1. Test should be no longer than three audio sweeps.
2. If the antenna is removed, a dummy load should be
substituted during the test.
3. Test should be conducted only within the time period
made up of the first five minutes after any hour.
4. If the operational tests must be made at a time not
including within the first five minutes after the hour,
the test should be coordinated with the closest FAA
Tower or Flight Service Station.
Consult FAA Advisory Circular AC 20-81 for detailed information
concerning the above caution.
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NAVAJO CHIEFTAIN SERVICE MANUAL