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12-2. EMERGENCY LOCATOR TRANSMITTER. (NARCO)
12-3. DESCRIPTION. The electrical power for the ELT is totally supplied by its own self-contained battery. The
battery must be replaced on or before replacement date marked on battery pack label. If the transmitter has been
used in an emergency situation or it has more than one hour of accumulated test time, the battery must be
replaced.
A remote switch located on the left side panel is provided to allow the transmitter to be turned on from inside
the cabin. The pilot's remote switch is placarded "ON" and ''ARMED''. The switch is normally in the ARMED
position. Moving the switch to ON will activate the transmitter. Moving the switch back to the ARMED position
will turn off the transmitter only if the impact switch has not been activated.
12-4. BATTERY REMOVAL AND INSTALLATION (NARCO.) (Refer to Figure 12-1 or 12-2.)
a. Set the ON/OFF/ARM switch on the transmitter to OFF.
b. Disconnect antenna coaxial cable from ELT.
c. Remove ELT from its mounting bracket by releasing the latch on the strap and sliding the ELT off the
bracket.
d. Extend the portable antenna.
e. Unscrew the four screws that hold the control head to the battery casing and slide apart.
f. Disconnect the battery by unsnapping the snap-off battery pigtail terminals from the bottom of the
transmitter printed circuit board.
g. Discard old battery pack. (Do not expose to flame.)
—CAUTION—
The battery pack is shipped with a sealant on the inside lip so that a
water tight seal will be retained. Do not remove this sealant.
h. Connect new battery pack terminals to the bottom of the circuit board.
i. Reinsert the control head section into 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.
j. Slide the portable antenna back into the stowed position.
k. Place transmitter into its mounting bracket and fasten the strap latch.
l. Connect the antenna coaxial cable to the ELT and ensure that the contact separator is inserted between the
antenna contact finger and portable antenna. (Refer to Figure 12-1.)
m. Press RESET button and set ON/OFF/ARM switch to ARM.
n. Make an entry in the aircraft logbook, including the new battery expiration date.
o. A unit operational check may now be performed on the ELT. (Refer to Testing ELT.)
p. Install the access plate on the right side of the fuselage aft sta. 228.30.
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
E L E C T R O N I C S
2F23