TM 55-1510-221-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
BEFORE TAXIING (CONT)
WARNING
Operation of the electric trim system should occur
only by movement of pairs of switches Any
movement
of
the
elevator
trim
wheel
while
depressing only one switch element denotes a
system malfunction. The electric elevator trim
control switch must then be turned OFF and flight
conducted by operating the elevator trim wheel
manually. Do not use autopilot
(I) Check pilot and copilot individual trim switch
elements for no movement of trim, then check
proper operation of both elements.
(2) Check pilot switches override copilot switches
while turning in opposite directions, and trim
moves in direction commanded by pilot
c.
Check pilot and copilot trim disconnects while
activating trim
d.
Elevator trim switch OFF then ON (ELECT TRIM
OFF annunciator extinguishes)
8.
Avionics Check and set as required.
9
INS NAV mode, if on.
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