TM 1-1520-238-T-4
4–119
4–37.
ENG START CIRCUIT BREAKER – DOES NOT STAY CLOSED (WITH ENG START NO 2
4–37
SWITCH IN START POSITION)
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68F
Aircraft Electrician
One person to assist
References:
TM 1-1520-238-23
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. Detach P978. Set and hold ENG START
NO 2 switch in START position. Check for short
between P463–X and ground.
Does short exist?
YES
Go to step 3.
NO
Go to step 2.
2. With grounding strap attached, check for short
between (A330)J2–A14 and ground.
Does short exist?
YES
Replace start mode relay panel
(TM 1-1520-238-23).
NO
Go to step 4.
3. Check for short between P173–H and ground.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 4–13.
NO
Replace pilot power quadrant
(TM 1-1520-238-23).
4. Check for short between P978–B3 and ground.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 4–13.
NO
Replace turbine starter switch
(TM 1-1520-238-23).
END OF TASK
