Piper ARROW III, Руководство по обслуживанию

Страница: 516 / 594

SECTION XII
ELECTRONICS
12-4. INTRODUCTION. This section of the manual contains information necessary to perform operational
checks of the Emergency Locator Transmitter (ELT), with and without a pilot’s remote switch. Included are the
appropriate removal and installation instructions to facilitate battery replacement.
12-5. EMERGENCY LOCATOR TRANSMITTER.
12-6. DESCRIPTION. The ELT is an automatically activated emergency locator transmitter which, when
activated, will radiate an omni-directional RF signal on the international distress frequencies. The radiated
signal is modulated with a distinctive audio swept tone.
Electrical power for the ELT transmitter is supplied by its own self-contained magnesium or alkaline
b a t t e r y. Per FAA regulations, a magnesium battery must be replaced 2 years from the date of manufacture
stamped on the battery pack and an alkaline battery must be replaced after 5 years of shelf life (replacement
date is marked on the transmitter label). The battery must be replaced if the transmitter has been used in an
e m e rgency situation or if accumulated test time exceeds one hour. To replace the battery pack in the
transmitter, it is necessary to remove the ELT from the airplane.
12-7. BAT T E RY REMOVAL AND INSTA L L ATION. (Communications Components Corp.) The ELT is
located on the right side of the airplane tail section, ahead of the stabilator.
a. Remove the access plate on the right side of fuselage aft of sta. 228.30.
b. Rotate the ON/ARM/OFF switch to the OFF position.
c.
Disconnect the antenna coax cable (twist left, then pull outwards).
d. Disconnect the harness to the pilot’s remote switch.
e.
Remove the forward mounting bracket by pulling the black plastic knob out. Remove the transmitter
from the airplane.
f. Remove the six Phillips-head screws securing the transmitter cover. Remove the cover.
g. Lift out the old battery pack.
h. Copy the expiration date on the battery into the space provided on the external ELT name and date
plate.
i. Disconnect and replace with a new battery pack. The nylon battery connector is a friction fit and is
easily removed by pulling on the exposed end.
j. Insert transmitter into airplane and fit into place. Replace mounting bracket by pushing the black
plastic knob into place.
k. Reconnect the pilot’s remote switch harness and the antenna coax cable to the transmitter.
l.
Set the ON/ARM/OFF switch to the ARM position.
m. Reinstall the access plate previously removed.
NOTE
It may be advisable to test the unit operation before installing the access
plate. (See paragraph 12-9.)
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.
Revised: 2/13/89
2J22
CHEROKEE ARROW III SERVICE MANUAL
ELECTRONICS