Boeing B737 - Reset ELT; Reinstall ELT; Installed Transmitter Test (Self Test); Antenna Test

B737
MAINTENANCE MANUAL
EFFECTIVITY
Post ELT STC ST03081AT
23-24-00
PAGE 212
JAN 02/07
(14)
Reset ELT
(a) To “RESET” the ELT, move the switch to the ON position then back to the OFF
position.
(15)
Reinstall ELT
(a)
Reinstall the ELT into aircraft as follows:
1) Insert the ELT into the mounting tray at an angle so that the locking ears at the
end opposite the direction-of-flight arrow fit into the mounting tray locking slots.
2)
Fit the protective top cover onto the ELT.
3) Ensure that the slots at the end of the cover fit over the locking ears on the
ELT prior to fitting cover into place at the connector end.
4) Feed the two coax cables through the holes in the end cap and connect them
to their respective connections on the ELT.
5) Position the end cap and connector assembly onto the ELT and tighten the two
thumbscrews securely.
6)
Visually inspect connections ensuring that they are seated properly.
(16)
Installed Transmitter Test (Self Test)
(a) Perform the transmitter tests by activating the ELT and listening on 121.5 MHz. Be
sure to follow the procedures as outlined in the Adjustment & Test section of this
Aircraft Maintenance Manual supplement.
(17)
Antenna Test
(a)
Action Notice A 8150.3 advises that:
1) “A low quality AM broadcast receiver should be used to determine if energy is
being transmitted from the antenna. When the antenna of the radio (tuning dial
on any setting) is held about 6 inches from the activated ELT antenna, the ELT
aural tone will be heard on the AM broadcast receiver. This is not a measured
check, but it does provide confidence that the antenna is radiating sufficiently
power to aid search and rescue. The aircraft’s VHF receiver, tuned to 121.5
MHZ, may also be used. This receiver , however, is more sensitive and could
pick up a weak signal even if the radiating ELT’s antenna is disconnect. Thus
it does not check the integrity of the ELT system or provide the same level of
confidence as does an AM radio”.
(18)
Logbook Entry
(a) Enter the date the test technician’s initial s and whether the ELT passed or failed into
the aircraft logbook.
(19)
ELT battery Pack Replacement
NOTE: The battery pack contains static sensitive parts, take ESD precautions before handling.
Remove the four screws from the battery pack before proceeding further, read the
following advisory to avoid damage to the ELT. Also refer to Figure 3.