C39.
C40.
C41.
C42.
C43.
C44.
C45.
TM 1-1510-225-MTF
One portion of interior lighting or lighting control
system inoperative.
a. Defective light circuit board.
b. Defective light bulbs.
c. Defective components in overhead control panel.
d. Defective power supply.
Fuel crossfeed valve inoperative or FUEL PRESS
annunciator light remains illuminated.
a. Defective standby fuel pump.
b. Defective crossfeed valve.
Standby fuel pump inoperative.
a. Defective standby pump.
b. Defective switch in fuel management panel.
Pneumatic surface deice system inoperative.
a. Defective surface deice time delay module.
b. Defective deice distributor valve.
c. Defective plumbing.
d. Defective boot.
Right and left FIRE warning lights do not illumi-
nate in test position of fire protection test switch.
a. Tripped fire detector circuit breaker.
b. Defective fire protection test switch.
c. Defective wiring.
Engine fire detection system wholly or partially
inoperative.
a. Defective sensing tube.
b. Defective fire detector.
c. Defective ENG FIRE SYS TEST SWITCH.
FIRE DET circuit breaker trips.
a. Short circuit in wiring or components.
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