Piper COMANCHE PA-24-180 Service Manual page 684

PIPER COMANCHE SERVICE MANUAL
SECTION XII
ELECTRONICS
12-l. Introduction. This section of the manual is divided into two parts. The first part consists of the
information necessary to perform an operational check of the Piper Automatic Locator Transmitter along
with the appropriate removal and nstallation instructiom to facilitae battery replacement. The second par
consists of wiring diagrams of the vinous configurations of avionics equipment insallations.
12-2. Pier Automatic Locator Trnnst iter.
The automatic locator transmitter when installed is located under the access panel on the dorsal fin.
This unit operates on its own self-contained battery. Refer to latest amendment of AD 79-18-05 If the
transmitter has been used in an emergency situation or it has more than ecL hour of accumulated test
time, the battery must be replaced according to FAA regulations. To replace the battery back in the
transmitter, it is necessary to remove the unit from the airplane. The following instructions should be
used:
a. Remove the access panel located on the dorsal fin.
b Remove the switch guard and set the ON/ARM/OFF switch to the OFF position.
c. Disconnect the whip antenna cable at the transmitter
d. Remove the rear mounting bracket and remove the transmitter from the airplane.
e.
Remove and keep the four screws secunng the transmitter's pain end cap. Carefully remove the
end cap. trving not to damage the sealant
f Carefully withdraw the battery pack from the transmitter unnl the connector is exposed
Disconnect the batten from the connector and discard the batterv
g Before installing the new battery pack. check the replacement date Transfer the self-stcking date
placard on the battenrv o the placard on the transmitter case.
h Connect the new batter pack to the connector and carefully install it into the transmitter
connector end first. It may be necessan to rotate the battery slightly to get it seated properly in the
transmitter case.
. Check the sealant on the end cap before putting it on the trinsmrter. If the sealant is damaged.
replace it with fresh silicone sealant. such as the type supplied by General Electnc Co. Secure the end cap
to the transmitter with the four screws previously removed.
J Install the assembled unit into the airplane and secure with aft mounting bracket. Connect the
whip antenna and set the ON/ARM/OFF switch to ARM.
NOTE
It mav be advisable to test the unit operation before installing the access
cover on the dorsal fin. Refer to Paragraph 12-3 for test procedures
k Install the access cover and make an eniv in the aircraft logbook
REVISED: 4/10/81 ELECTRONICS
3 H2