Landing gear (mechanical) will extend but will not retract

TM 55-1510-218-MTF

C15.

Landing gear (mechanical) will extend but will

not retract.

a. Open circuit between landing gear switch

and control relay.

b. Up solenoid of control relay inoperative.

c. Open circuit between control relay and up

winding in motor.

C16.

Landing gear (hydraulic) fails to retract.

a. Safety switch not closing.

b. Pressure switch not closing.

c. Gear selector valve stuck.

d. Circuit is open between the selector valve

and the power relay.

e. Time delay circuit opening prematurely.

f. Hand pump handle improperly stowed.

g. Service valve in up position.

C17.

Landing gear (mechanical) will retract but will

not extend.

a. Open circuit.

b. Down limit switch inoperative.

c. Open circuit between control relay and

down winding of motor.

C18.

Landing gear (hydraulic) fails to extend.

a. Service valve switches faulty.

b. Landing gear selector valve stuck in up posi-

tion.

c. Control switch not providing power to the

extend side of selector valve.

C19.

Landing gear (mechanical) circuit breaker trips.

a. Grounded control circuit.

b. Grounded motor circuit.

c. Mechanical defect in gear causing overload.

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