TM 1-1520-238-T-4
4–120
4–38.
ENG START ENG 2 INDICATOR – IS NOT LIGHTED WITH ENGINE 2 STARTED
4–38
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
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
RN1 door open
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. On pilot master caution/warning panel, press
and hold PRESS TO TEST indicator.
Is ENGINE 2 START indicator lighted?
YES
Go to step 2.
NO
Go to step 6.
2. Check for 28 VDC at P40–3.
Is voltage present?
YES
Go to step 4.
NO
Go to step 3.
3. Check for open between
P40–4 and (A402)TB2–8–N.
Does open exist?
YES
Repair open wire. Go to
paragraph 4–13.
NO
Replace (A402)TB2–8
(TM 1-1520-238-23).
4. Check for open between P40–3 and P22–26.
Does open exist?
YES
(ABY) Repair open wire.
Go to paragraph 4–13.
(ABZ) Replace wire harness
(TM 1-1520-238-23).
NO
Go to step 5.
5. Check for open between
P748–J and J22–26.
Does open exist?
YES
Repair open wire. Go to
paragraph 4–13.
NO
Replace engine start regulator
valve (TM 1-1520-238-23).
Go to paragraph 4–13.
6. Check for open between
P748–H and P173–A.
Does open exist?
YES
Repair open wire.
Go to paragraph 4–13.
NO
Go to step 7.
7. Check for open between (A24):
J1–A and J1–P.
Does open exist?
YES
Replace pilots power quadrant
(TM 1-1520-238-23).
NO
Replace multi–channel dimming
controller (TM 1-1520-238-23).
END OF TASK
