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A. Remove the ELT
Detail Steps/Work Items Key Items
(1) Disconnect all the cables from ELT. At the ELT.
(2) Release the Velcro strap which hold the ELT
in its mounting and remove the ELT from the
airplane.
Velcro strap.
WARNING: IF THE ELT IS MOVED TO A DIFFERENT AIRPLANE THAN WHICH
IT WAS ORIGINALLY REGISTERED WITH, THE ELT MUST BE REREGISTERED
AND THE PRODUCT LABEL RE-MARKED TO
INDICATE THE NEW PROGRAMMING AND/OR NEW COUNTRY OF
REGISTRY.
Equipment/Furnishings
DA20-C1 AMM
Page 202
30 Apr 2009 25-60-01 Doc # DA201-C1
Rev. 15
Figure 1 – Removal/Installation of ME406 ELT
B. Install the ELT
Detail Steps/Work Items Key Items
WARNING: IF THE ELT IS MOVED TO A DIFFERENT AIRPLANE THAN WHICH
IT WAS ORIGINALLY REGISTERED WITH, THE ELT MUST BE REREGISTERED
AND THE PRODUCT LABEL RE-MARKED TO
INDICATE THE NEW PROGRAMMING AND/OR NEW COUNTRY OF
REGISTRY.
(1) Put the ELT into position to the mounting
bracket.
(2) Secure the ELT with the Velcro strap. Velcro strap.
(3) Connect all the cables to the ELT that were
disconnected during removal.
(4) Do a test for the correct operation of the
ELT.
Refer to paragraph 3
DA20-C1 AMM
Equipment/Furnishings
Doc # DA201-C1
Rev. 15 25-60-01 Page 203
30 Apr 2009
3. ELT Functional Test
Note: Do this test only during the first 5 minutes of each hour. If you are at a location
with a control tower or other monitoring facility, tell them before you do the test.
Note: For maintenance done to FAR 91 (airplanes registered in the USA) an additional
functional test of the ELT is required. Refer to FAA Action Notice 8150.3 for
more data.
CAUTION: DO NOT ALLOW THE TEST DURATION TO EXCEED 5 SECONDS.
THE ELT WILL TRANSMIT A 406.025 MHZ SIGNAL AFTER THE ELT
IS ACTIVE FOR APPROXIMATELY 47 SECONDS. THE SATELLITE
SYSTEM CONSIDERS THIS TRANSMISSION TO BE A VALID
DISTRESS SIGNAL.
Detail Steps/Work Items Key Items
(1) Set the AVIONICS MASTER switch to ON.
(2) Set the radio to receive on 121.5 MHz.
(3) Set the ELT switch to ON for 1 second.
(4) Make sure that the receiver voices three
audio sweep tones.
(5) Set the ELT Switch to ARM. Pay special attention to the LED activity
upon entering the 'ARM' condition.
If a problem is detected, the LED provides
a coded signal following the initial 1 second
pulse. Refer to the ME 406 ELT
manufacturer's Operator’s Manual for
coded signals.
(6) Make sure that the ELT unit flashes once.
(7) Set the AVIONICS MASTER switch to OFF.
4. Replace the ELT Batteries
You must only use a battery pack that is supplied by the equipment manufacturer.
Note: The battery pack contains components that are sensitive to static electricity. You
must take electro-static discharge precautions before doing work on the battery
pack.
Note: The battery pack is connected to the ELT by a short electrical cable assembly.
You must take care not to strain this cable when you separate the battery pack
from the ELT.
Equipment/Furnishings
DA20-C1 AMM
Page 204
30 Apr 2009 25-60-01 Doc # DA201-C1
Rev. 15
Detail Steps/Work Items Key Items
(1) Remove the ELT from the airplane ELT
mounting.
Refer to Paragraph 2.
(2) Remove the battery pack as follows:
• Remove the 8 screws from the batteryside
cover.
• Carefully move the battery pack a
short distance clear of the ELT.
• Disconnect the wiring harness.
• Move the battery pack clear of the
ELT.
Refer to Figure 2.
Hold the battery pack to the ELT with your
hand to prevent the battery pack
separating from the ELT.
(3) Do a visual inspection of the underside of the
ELT (the battery pack side). Look especially
for corrosion or other damage to the ELT
casing.
(4) Prepare the new battery pack for installation.
(5) Lay the battery pack on the work surface
with the batteries facing up.
(6) Install the replacement seal. In the slot along the perimeter housing.
(7) Position the ELT over the battery pack and
plug the connector into the battery assembly.
Make sure that the cable is not twisted and
that the connector is correctly attached.
(8) Mate the ELT to the battery. Make sure that the seal is positioned
correctly.
(9) Install the 8 screws that attach the battery
pack to the ELT.
(10) Install the ELT in the airplane mounting and
attach the Battery Pack Replacement Date
label to the top surface of the ELT protective
cover where it can be easily seen.
Refer to Paragraph 2.
(11) Record the details of the ELT battery pack
　
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