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 TM 55-1510-218-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
LOW SPEED SYSTEMS CHECK (CONT)
b. Landing gear relay circuit
breaker - Out (pulled).
c. Landing gear control switch -
DN.
d. Landing gear alternate engage
handle - Lift and turn clock-
wise to the stop (one quarter
turn).
e. Alternate landing gear exten-
sion handle - Pump. The lever
actuates a double-acting ratchet
and requires little effort to op-
erate. About 70 complete
strokes of the lever will be re-
quired to lower and lock the
gear.
f. Gear down indicator lights (3)
Monitor. Stop pumping ratch-
et when gear down indicator
lights are illuminated.
As full extension is approached, proceed
cautiously, and stop when the green lights
come on, or resistance is felt in the handle.
Further movement of the handle could dam-
age the driving mechanism and impair sub-
sequent retraction.
*15. Emergency landing gear extension
system (hydraulic, C-12D after air-
craft serial number 84-24375, and
C-12F) - Check operation and con-
dition as follows:
2-68
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