TM 55-1510-215-MTF
c.
Defective external power relay.
d.
Loose or wrong connection in external power circuit
C13. Landing gear will not retract or lower.
a.
Circuit breaker tripped in control or motor circuit.
b.
Loose motor ground connection.
c.
Open circuit.
C14. Landing gear will lower but 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.
C15. Landing gear will retract but not lower.
a.
Open circuit.
b.
Down limit switch inoperative.
c.
Open circuit between control relay and down winding of
motor.
C16. Landing gear circuit breaker trips.
a.
Grounded control circuit.
b.
Grounded motor circuit.
c.
Mechanical defect in gear causing overload.
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