All references to maintenance requirements for the US should also apply to all ELT users outside of the US unless otherwise required by the installer / aircraft maintenance procedures or the relevant national regulations.
4.4 Maintenance Steps

4.4.1 Remove ELT Connections

Loosen the thumbscrews and remove the D-sub and RF connectors. Visually inspect and confirm proper seating of all connector pins. Special attention should be given to coaxial center conductor pins which are prone to retracting into the connector housing.
4.4.2 Remove ELT

Remove the ELT from its mounting tray. Inspect the mounting hardware. Ensure the hardware is free of cracks or other obvious damage.
4.4.3 Corrosion Inspection

Inspect all metal parts of the ELT exterior, its mounting tray, RF coax cable, remote switch and cable, and the antenna and its hardware for signs of corrosion.  This includes mounting screws, electrical connectors, antenna base mount, etc.
4.4.4 Battery removal

 
1) Remove the 8 securing screws from the battery-side cover. Battery pack is identified by the embossed text: “BATTERY ACCESS ON THIS SIDE”.

2) Carefully lift the battery cover (battery pack) away from the ELT and unplug the flex-cable connected to the pack. Do not pull on the flexible portion of the cable - use the rigid section of the flex circuit at the connector as a handle.

3) Inspect the battery pack and ELT chassis. The battery cells, components and connectors should be free of corrosion. Inspect flex-circuit for broken connections or damage. Ensure the battery housing is free of cracks or other visible damage.

4) Verify the battery expiration date. If the battery pack has not expired it may be reinstalled. The battery pack must be replaced with a new one:

. After use in an emergency.

. When the transmitter has been in use for more than 1 cumulative hour; (7 flash error)

. After an inadvertent activation of unknown duration.

. On or before the battery replacement (expiration) date.

. There is any evidence of corrosion or leakage of any cell or on the small interface board and connector.

Caution!
The battery pack contains electrostatic sensitive parts. Take ESD precautions before handling.
Damage may happen to the exposed electronic parts and prevent correct operation of the ELT. Refer to paragraph 5.1 for methods of preventing an Electrostatic Discharge (ESD).

4.4.5 Battery replacement

For replacement battery pack order battery pack kit 455-0012.  This kit contains:
. Battery pack (452-6499, Li/MnO2, yellow)

. Replacement gasket (183-0050, 1 ea.)

. Log book entry label (200-01-0006, 1 ea.)

. Extra mounting screws (201-0402, Philips, truss-head, 6-32x7/8, 2 ea.)

. Battery pack installation instruction, ME406P lithium battery packs (571-6504, 1 ea.)
　
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