Piper Navajo PA-31 Service Manual page 904

12-16. BATTERY REMOVAL AND INSTALLATION (NARCO). (Refer to Figure 12-6 and 12-7.)
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 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.
j.
Slide the portable antenna back into the stowed position.
k.
Place transmitter into its mounting bracket and fasten the strap latch.
1. 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. (Refer to Figure 12-7.)
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 Emergency Locator
Transmitter.)
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.
12-17. DESCRIPTION, OPERATION AND TESTING OF PILOTS REMOTE SWITCH. (Refer to
Pilot's Operating Handbook.)
12-18. TESTING EMERGENCY LOCATOR TRANSMITTER. (Refer to Paragraph 12-5.)
Added: 9/24/81
5A22
ELECTRONICS
5A22
PIPER NAVAJO SERVICE MANUAL