Cessna 172R Pilot Operating Handbook page 278

SECTION 9 - SUPPLEMENTS
CESSNA
SUPPLEMENT 4 - FAA APPROVED
MODEL 172R
1. ENSURE ELT ACTIVATION:
Position remote switch/annunciator to the ON position even
if annunciator light is already on.
If airplane radio is operable and can be safely used (no
threat of fire or explosion), turn ON and select 121.5 MHz.
If the ELT can be heard transmitting, it is working properly.
Ensure that antenna is clear of obstructions.
NOTE
When the ELT is activated, a decreasing tone will
be heard before the typical warbling tone begins.
2. PRIOR TO SIGHTING RESCUE AIRCRAFT
-- Conserve
airplane battery. Do not activate radio transceiver.
3. AFTER SIGHTING RESCUE AIRCRAFT
--
Position remote
switch/annunciator to the RESET position and release to the
AUTO position to prevent radio interference. Attempt contact
with rescue aircraft with the
radio transceiver set
to
a
frequency of 121.5 MHz. If no contact is established, return
the remote switch/annunciator to the ON position immediately.
4. FOLLOWING RESCUE -- Position remote switch/annunciator
to the AUTO position, terminating emergency transmissions.
SECTION 4
NORMAL PROCEDURES
As long as the remote switch/annunciator is in the AUTO position
and the ELT master function selector switch remains in the AUTO
position, the ELT automatically activates when the unit senses
longitudinal inertia forces as required in TSO-C91A.
Following a lightning strike, or an exceptionally hard landing, the
ELT may activate although no emergency exists.
If the remote
switch/annunciator illuminates, the ELT has inadvertently activated
itself. Another way to check is to select 121.5 MHz on the radio
transceiver and listen for an emergency tone transmission. If the
remote switch/annunciator is illuminated or an emergency tone is
heard, position the remote switch/annunciator in the RESET position
and release to the AUTO position.
S4-6
Dec 2/96
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