B737
MAINTENANCE MANUAL
EFFECTIVITY
Post ELT STC ST03081AT
23-24-00
PAGE 501
JAN 02/07
EMERGENCY LOCATOR TRANSMITTER SYSTEM
ADJUSTMENT & TEST
1. General
A.
This section describes procedures for periodic testing of the ELT system. Any obvious damage to
any ELT system component should be rectified before proceeding.
2. ELT operation Tests
A.
The system test is an operational test used to test the basic functionality of the ELT system. This
test does not give specific levels of performance for any of the functions of the ELT but it does
indicate that the system is functioning in a satisfactory manner. The system test is detailed
below:
(1) Always perform the test within the first five minutes of the hour (UTC) as required by AC
43.13-1B, 12.21 and 12.22 Note 3. Be sure to notify any nearby control tower of your
intentions.
WARNING: DO NOT ALLOW TEST DURATION TO EXCEED 5 SECONDS. The ELT will
transmit a 406.025 MHz signal after the ELT is active approximately 47
seconds; the satellite system considers the transmission to be a valid signal.
(2)
Ensure ELT system circuit breakers are closed.
(3)
Tune a VHF receiver to 121.5 MHz.
(4) Turn the ELT remote switch panel ON, wait for 3 sweeps of the receiver, which takes about
1 second , and then turn the switch back to ARM (OFF) position while paying attention to
the LED activity upon entering the ARM (OFF) condition.
B.
De-energize the A?C electrical systems, if no longer required; refer to the Aircraft maintenance
Manual Chapter 24.
C.
Return aircraft to serviceable condition.
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