B737
MAINTENANCE MANUAL
EFFECTIVITY
Post ELT STC ST03081AT
23-24-00
PAGE 214
JAN 02/07
(a)
Lay the ELT on its side.
(b)
Carefully lift the battery pack away from the ELT and lay along side the ELT.
(c) Carefully disconnect the harness from the 8-pin connector on the small circuit board
in the battery pack. Do not short connector pins.
(d)
Disconnect 2-pin harness.
(e)
Inspect the battery pack and underside of ELT.
(f) Battery cells, components and connectors should be corrosion free. The underside
of ELT should be corrosion free.
(g)
Inspect for any broken wires or connections.
(h)
Ensure the battery housing is free of cracks or other visible damage.
(i)
The battery pack must be replaced with a new one:
1)
After use in an emergency;
2)
After an inadvertent activation of unknown duration;
3)
When the total of all known transmissions exceeds one hour;
4)
On or before the battery replacement (expiration) date.
NOTE: The battery pack (452-0133) expires 5 years from the date (month) it is shipped from
ARTEX.
(j) When installing a new battery pack, remove the paper backing from the rubber seal
at the connector end of the battery pack.
(k) It is recommended that this seal be coated with a non-petroleum based silicone
grease (i.e. GE G-635) to provide a moisture resistant seal once the battery is
installed.
(l) To replace/reinstall the battery pack, connect the 8-pin connector to the header on
the circuit board in the battery pack.
(m) Connect 2-pin connector to the recessed connector inside the ELT body. This step
will cause the ELT to activate.
(n)
Reset the ELT by toggling the ON/OFF switch in the ELT from ON to OFF.
(o) Reseat the battery pack on the ELT, dressing the harness wires away from the
standoffs to avoid pinching the wires between the battery pack and the standoffs.
(p) Connect the SARSAT Beacon Test Set, through a 30 dB (minimum) attenuator, to
the ELT’s BNC connector.
(q) Activate the ELT and allow the ELT to transmit 3 to 4 406.025 MHz bursts.
Thereupon, verify that there is not a “BAD FRAME” or “NORMAL BAD” message on
the test set display which would include a problem with the battery pack(i.e. a bad IC
on the battery circuit board).
(r) Install the four Phillips head screw and tighten securely. Do not over torque the
screws.
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