Piper Automatic Locator Transmitter - Piper PA-24 Comanche Service Manual

P,PER COMANCHE SERVICE MANUAL
SECTION XII
ELECTRONICS
1Z·t. lnaodumon.
This
seen on of the m&r1ual is divided into two pans. The first put consists of the
information necessary to perlonn an open.tionai check of the Piper Automatic Locator Transmitter along
with the appropriate removal and installation instnlc:UOns to facilitate battery replacement. The second part
consists of wiring diagrams of the various confiprations of avionics equipment installations.
lZ·Z. Piper Automatic Locator TflllSmiaer.
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 one 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 donal tin.
b. Remove the switch
ruarci
and
set
the ON/ARM/OFF switch to the OFF position.
c. Disconnect the whip antenna cable at the u.nsmitter.
d. Remove the rear mounting bracket and remove the m.nsmitter from the airplane.
e. Remove and keep the four screws securing the transmitter's plain end cap. Carefully remove the
end cap. trying not to damage the seaiant.
t.
Carefully withdraw the banery pack from the tr:Utsmitter until the connector is exposed.
Disconnect the battery from the connector and discard the battery.
g. Before innallin! the new bilnery pack. check the replacement date. Transfer the self·stickmg date
placard on the battery to the pllea-rd on the transmitter case.
h. Connect the new battery pack to the connector and carefully in!t:lJ1 it into the transmitter -
connector end first. It may be necessary to rotate the battery sli,hdy to get it seared
properl~'
in the
transmitter case.
1.
Check the sealant on the end cap before putting it on the tr&nsmitter. If the sealant is damaged.
replace it With fresh silicone sealant. such u the eype supplied by General Electric Co. Secure the end cap
to the transmitter with the four screws previously removed..
J. Install the assembled unit into the airpl&ne and seC:-.lre with aft mounting bracket. Connect the
whip antenna and set the
O~/ARM/OFF
switch to AR.\"
NOTE
It may be advisable to test the unit operation before inStalling the access
cover on the dorsal fin. Refer to P&r3Jt2ph
12·3
for tCSt procedures.
... Install the access cover and make an entry in the aircraft 1000ook.
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REVISED: 4/10/81
3 H2
ELECTRONICS
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