External power fails to energize aircraft.

TM 55-1510-218-MTF

b. Voltage regulator set too low.

c. Internal connection links loose.

d. External connector burned or pitted.

e. Defective or reversed cells.

f. Cell case current leakage.

C12.

External power fails to energize aircraft.

a. Defective or incorrectly polarized external

power source.

b. Defective external power receptacle.

c. Defective external power relay.

d. Loose or wrong connection in external pow-

er circuit.

C-13.

Landing gear (mechanical) will not retract or ex-

tend.

a. Circuit breaker tripped in control or motor

circuit.

b. Loose motor ground connection.

c. Open circuit.

C-14.

Landing gear (hydraulic) will not retract or ex-

tend.

a. Landing gear relay circuit breaker tripped.

b. Landing gear power circuit breaker tripped.

c. Landing gear power safety control circuit

breaker tripped.

d. Landing gear power and sense circuit break-

er tripped.

e. Landing gear safety power circuit breaker

tripped.

f. Faulty power pack motor.

g. Faulty power relay.

h. Faulty remote-controlled circuit breaker

(RCCB).

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