EMERGENCY EQUIPMENT
Emergency Locator Transmitter
Aircraft Operations Manual
6/7.1
S2
PAGE
1
Apr 01/15
A/C 171
−
299
1.
GENERAL
The Emergency Locator Transmitter (ELT) facili-
tates search and rescue in case of a crash landing.
It activates automatically on impact, transmitting on
civil as well as military aeronautical distress fre-
quencies (121.5 and 243 MHz).
It is located aft of the cargo compartment, installed
with screws and is not removable without tools.
2.
DESCRIPTION
The ELT operates independent of the aircraft batter-
ies. It is waterproof, crash resistant, and will nor-
mally be operative after a crash landing.
At a 5
−
7 G nominal impact, the ELT automatically
activates, transmitting an emergency signal contain-
ing 2
−
4 downsweep (1,600
−
300 Hz) signals per
second. The self
−
contained battery has a minimum
capacity of 52 hours of transmission.
There is one permanent external antenna mounted
on the tail cone.
The ELT is controlled by an internal impact switch
and an ELT switch on the transmitter front panel.
Remote control of the ELT is possible by way of a
two
−
position (ON
−
ARMED) switch on the cockpit
overhead EMERGENCY panel.
3.
OPERATION
3.1
Automatic activation
For normal operation, the ELT switch in cockpit
shall be guarded in ARMED position. The ELT will
then activate automatically on impact.
3.2
Manual activation
The ELT can be purposely activated by setting the
ELT switch in cockpit to ON.
3.3
Deactivation
Should the ELT be inadvertently activated, gain ac-
cess to the transmitter, set its front panel AUTO
−
OFF
−
ON switch to OFF, and then back to AUTO.To
prevent unnecessary search
−
and rescue actions,
inform ATC immediately. Also, make an entry in the
aircraft log book.
IMPORTANT:
To prevent unnecessary search
−
and
rescue actions, inform ATC immediately if the ELT
has been switched on inadvertently.