B737
MAINTENANCE MANUAL
EFFECTIVITY
Post ELT STC ST03081AT
23-24-00
PAGE 202
JAN 02/07
(3)
Remove Battery pack
NOTE: The battery pack contains static sensitive parts, take ESD precautions before handling.
Remove the four screws from the battery pack. Before proceding further, read the
following advisory to avoid damage to the ELT. For detailed instructions refer to step
(19) and Figure 3.
WARNING: The battery pack is connected to the ELT via short interconnect harnesses which
limit the distance of separation between the two components prior to disconnecting
the harnesses. Proceed as follows:
•
Lay the ELT on its side.
•
Carefully lift the battery pack away from the ELT and lay along side the ELTunit.
•
Carefully disconnect the harness from the 8-pin connector on the small circuit board in the
battery pack. Do not short connector pins.
•
Disconnect 2-pin harness from the ELT body.
(a) Inspect the battery pack and the underside of the ELT.
(b) The battery cells, components and connectors should be free of corrosion.
(c) The underside of the ELT should be corrosion free.
(d) Inspect for any broken wires or connections.
(e) Ensure the battery housing is free of cracks or other visible damage.
(f)
Verify the battery expiration date. If the battery pack has not expired it may be
reinstalled. However, for optimum performance, it is recommended that the battery
be replaced if the voltage under load is less than 12.0 vdc.
(g) The battery pack must be replace with a new one.
1) After use in an emergency;
2) After an inadvertent activation of un-known duration;
3) After the total of all known transmissions exceeds one hour;
4) On or before the battery replacement (expiration date).
(4)
Replace/Reinstall Battery Pack
(a)
To replace/reinstall the battery pack, connect the 8-pin connector to the header on
the circuit board in the battery pack.
(b)
Connect the 2-pin power harness to the ELT. This step will cause the ELT to
activate.
(c) Reset the ELT by toggling the ON/OFF switch on the ELT from ON to OFF.
(d)
Fit the battery pack into place dressing wires away from the standoffs to avoid
pinching wires between standoffs and battery pack.
(e)
Install two screws diagonally from each other to secure battery pack during the tests
that follow.
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