TM 55-1510-220-MTF
C20.
All landing gear position indicators and switches inoperative.
a.
Landing gear circuit breaker tripped.
b.
Open circuit between circuit breaker and indicators.
C21.
One landing gear position indicator inoperative.
a.
Defective indicator or lamp.
b.
Open circuit.
c.
Defective indicator switch.
C22.
Landing gear warning horn fails to shut off when landing gear is extended.
a.
Defective or out of adjustment down-lock switches.
C23.
Landing gear down position indicator lights are illuminated with landing gear retracted.
a.
Defective or out of adjustment down lock switch.
b.
Wrong connection in light test circuit.
c.
Ground between light and down lock switch.
C24.
Landing gear down position indicator light inoperative.
a.
Defective or out of adjustment down lock switch.
b.
Defective indicator light.
C25.
Landing gear handle light is illuminated with gear up and locked.
a.
Defective or out of adjustment up-lock switch.
C26.
Landing gear handle light inoperative.
a.
Defective or out of adjustment up-lock or down-lock switch.
b.
Defective landing gear control switch.
C27.
Landing gear motor fails to shut off when gear retracted.
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