TESTING EMERGENCY LOCATOR TRANSMITTER
The transmitter operates on the emergency frequencies of 121.5 and 243 MHz. Both of these frequencies
are monitored by FAA installations. Before performing any operational test of an elt, the following precautions
must be observed.
Test 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:
l. Test should be no longer than three audio sweeps.
2. If antenna is removed, a dummy load should be substituted during test.
3. Test should be conducted only within the time period made up of the first five minutes after any hour.
4. If operational tests must be made at a time not included within the first five minutes after the hour, the
test should be coordinated with the closest FAA tower and flight service station.
Consult FAA Advisory Circular AC20-81 for detailed information concernin~ the above.
—NOTE—
If the aircraft is not fitted with a communications receiver,
request that tower listen for your test.
l. Remove access plate on right side of fuselage aft of sta. 228.30.
2. Tune aircraft communications receiver to 12l.5 MHz and switch receiver ON; deactivate squelch, and
turn receiver volume up until a slight background noise is heard.
—CAUTION—
Whenever unit is checked by moving transmitter ON/ARM/OFF
switch from ARM to ON position, it must then be moved to OFF
position before reverting to ARM position again.
3. On transmitter, set ON/ARM/ OFF switch to ON position. Keep switch in this position for only a few
seconds; then set to OFF position. Return to ARM position.
—NOTE—
The test transmission should be picked up by aircraft
communications receiver or control tower. During cold weather,
there may be a slight delay before transmission occurs.
4. A transmitter which is functioning properly should emit a characteristic downward swept tone.
5. When test is completed, ensure transmitter ON/ARM/OFF switch is in ARM position.
6. Place access panel on right side of fuselage aft of sta. 228.30.
—NOTE—
Under normal conditions, transmitter switch is set to ARM.
END
23 - 21 - 00
Page - 23 - 06
Reissued: August 1, 1986
1H19
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
To Next Page
Loading...
