Piper Cherokee Six Service Manual page 650

PIPER CHEROKEE SERVICE MANUAL
SECTION XI
ELECTRONICS
11-1. INTRODUCTION.
This section of the manual contains instructions relating to the
removal, installation and operational checks of the Emergency Locator Transmitter (ELT)
and also removal and installation of the RCA Weather Scout radar antenna.
11-2. EMERGENCY LOCATOR TRANSMITTER.
11-3. DESCRIPTION. The electrical power for the ELT is totally supplied by its own
self-contained battery. The magnesium batteries used on early models have a service life of
four years. However, to comply with FAA regulations, magnesium batteries must be replaced
every 2 years. If the transmitter has been used in an emergency situation during this 2 year
period or it has more than one hour of accumulated test time, the battery must be replaced ac-
cording to FAA regulations. To replace the battery pack in the transmitter, it is necessary to
remove the transmitter from the aircraft. (Refer to paragraph 1 1-4.)
11-4. BATTERY REMOVAL AND INSTALLATION. (2 year, magnesium battery refer
to
Figure 11-1.) The ELT is located on mounting brackets on the right side of the fuselage aft
of sta. 259.30.
a. Remove the access plate on the right side of the fuselage aft of sta. 259.30.
b. Set the ON/ARM/OFF switch on the transmitter to the OFF position.
c. Disconnect the antenna coax from the transmitter.
d. Disconnect the harness to the pilot's remote switch.
e. Remove the rear mounting bracket by pulling the plastic knob out. Remove the
transmitter from the airplane.
f.
Remove the two long or four short screws securing the transmitter plain end cap.
Remove the plain end cap.
g. Disconnect the battery connector from the board terminals.
h. Withdraw the battery pack from the transmitter case.
i.
Before installing the new battery pack. check the replacement date printed on the
battery. Transfer this date onto the outside of the ELT.
j.
Slide the new battery pack, plain end first, into transmitter. It may be necessary to
rotate the battery slightly to get it seated properly in the transmitter case and to achieve
correct orientation of the battery connector.
k. Connect the battery connector to board terminals.
1. Insure O-ring is fitted in plain end cap and correctly seated.
ELECTRONICS
Revised: 12/15/80
3F8