Textron Aviation Cessna 172S NAV III Skyhawk SP, Information Manual

Page: 326 / 490

SECTION 9 - SUPPLEMENTS CESSNA
SUPPLEMENT 1 MODEL 172S NAV III
U.S.
FAA APPROVED
NORMAL PROCEDURES
When 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.
After a lightning strike, or an exceptionally hard landing, the ELT may
activate although no emergency exists. If the remote switch/
annunciator comes on, 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 on or an emergency tone is heard, position the remote
switch/annunciator in the RESET position and release to the AUTO
position.
The ELT must be serviced in accordance with FAR Part 91.207.
INSPECTION/TEST
1. The emergency locator transmitter should be tested every 100
hours.
NOTE
Test should only be conducted within the first 5 minutes of
each hour.
2. Disconnect antenna cable from ELT.
3. Set the MASTER switch BAT in the ON position.
4. Turn airplane transceiver ON and set frequency to 121.5 MHz.
5. Place remote switch/annunciator in the ON position. The
annunciator should come on. Permit only three emergency tone
transmissions, then immediately reposition the remote switch/
annunciator to the RESET position and release to the AUTO
position.
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172SPHAUS-S1-00
S1-10
For
Training
Purposes
Only