B737
MAINTENANCE MANUAL
EFFECTIVITY
Post ELT STC ST03081AT
23-24-00
PAGE 102
JAN 02/07
C.
There is a sequence to the problem reporting which is the same order as listed above. That is, if
the G-switch circuit has a failure, there will be a single flash then 3 flashes would appear if there
was a transmitter problem and so on.
NOTE: For installations using the ELT/NAV interface, there is an error condition where the LED
on the ELT and remote will flash rapidly. This occurs 2 minutes after power is applied to
the ELT/NAV Interface if the ELT is not responding because either 1) the ELT is
programmed for a protocol other than 24 bit and the ELT/NAV Interface has been
strapped for a 24 bit address or 2) the RS-232 TX line from the ELT (pin 12) to the
ELT/NAV Interface (pin 10) is not connected.
D.
After initial installation, ARTEX recommends a monthly “self test” of the ELT by following the
steps defined in the Adjustment & Test section of this Aircraft Maintenance Manual supplement.
Testing of the ELT in excess of once a month is not recommended as the battery life will be
shortened by excessive activation.
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