TM 55-1510-221-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
BEFORE TAXIING (CONT)
3 seconds DN TRIM
annunciator should illuminate
after approximately 8 seconds
(b)
Control wheel Hold forward of
mid travel Trim wheel should
run nose up after
approximately 3 seconds, UP
TRIM annunciator should
illuminate after approximately
seconds, and AP TRIM FAIL
annunciator and MASTER
WARNING lights should
illuminate after approximately
15 seconds.
(7)
AP/YD & TRIM DISC button Depress to
second level. Autopilot and yaw damper
should disengage and ELECT TRIM OFF
annunciator should illuminate AP ENG and
YD ENG annunciators on instrument panel
should flash 5 times
(8) Elevator trim control switch OFF, then
on (ELEC TRIM OFF annunciator should
extinguish (9) Autopilot Re-engage
(10) Turn controller Check that control wheel
follows
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