Piper Navajo PA-31 Service Manual page 898

12-8. INADVERTENT ACTIVATION.
a. In the event the ELT is inadvertently activated in aircraft without a pilot's remote switch, the
ELT will have to be reset by gaining access to the ELT. (Refer to Paragraphs 12-4 or 12-4a.) Put the
ON/ARM/OFF switch in the OFF position. To reset for automatic operation, return switch to the ARM
position. (See Note.)
b. In aircraft with a pilot's remote switch, if the ELT is inadvertently activated, set the pilot's
remote switch to the RESET position; then return it to the ARM position. (See Note.)
NOTE
As a routine precaution, it is recommended that the ELT battery
be replaced at the earliest opportunity after inadvertent activation
and a functional test be made in accordance with Paragraph 12-5.
Note, however, that the problem may not be in the transmitter.
Check the following:
1. Proper spacing of antennas so as to minimize antenna
conducted RF.
2. Rigidity of the transmitter installation.
CAUTION
Under normal conditions, the pilot's remote switch must be set to
ARM position.
12-9. EMERGENCY LOCATOR TRANSMITTER (COMMUNICATIONS COMPONENTS CORP.)
(Refer to the latest revision of Piper Service Letter No. 820.)
12-10. DESCRIPTION. The electrical power for the ELT is totally supplied by its own self-contained battery
However, aircraft power is required to shut off the transmitter with a remote switch. For portable use, the ELT
can be easily removed from its mounting in the aircraft. FAA regulations require that the battery be replaced:
1) on or before the expiration date on the unit; 2) if the transmitter has been used in an emergency situation;
3) if the accumulated test time exceeds one hour or 4) if the unit has been inadvertently activated for an
undetermined time period.
12-11. BATTERY REMOVAL AND INSTALLATION. The ELT is located underneath the dorsal fin
between sta. 304.75 and sta. 317.00.
a.
Remove the access panel on the dorsal fin between sta. 296.00 and sta. 317.75.
b. Rotate the ON/ARM/OFF switch to 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. Make an entry in the aircraft logbook of the new battery replacement date.
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. Reinstall mounting bracket by pushing the
black plastic knob into place.
Revised: 9/24/81
ELECTRONICS
5A16
PIPER NAVAJO SERVICE MANUAL