TM 1-1520-238-T-4
Change 4
4–151
4–60.
ENGINE 2 DOES NOT RESTART – CKT A AND CKT B SWITCHES RELEASED
4–60
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
One person to assist
References:
TM 1-1520-238-23
TM 55-2840-248-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
L200 panel removed
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. Visually inspect engine start relay panel for oil
contamination of the start relay box.
Is oil present?
YES
Clean engine start relay box
(TM 1-1520-238-23).
NO
Go to step 2.
2. Check for open between:
P46–17 and P46–19,
P46–17 and P46–18.
Does open exist?
YES
Go to step 4.
NO
Go to step 3.
3. With electrical power applied, set and hold CKT
A switch in ENG 2 position on pilot EMERG
PWR CHK OVSP TEST panel. Check for open
between:
P46–17 and P46–19,
P46–17 and P46–18.
Does open exist?
YES
Go to step 6.
NO
Go to step 5.
4. Detach P22. Check for open between:
J22–17 and J22–19,
J22–18 and (A330)XK2–7/8–A2,
(A330)XK2–5/6 SP1 and (A330)XK2–5/6–A3.
Does open exist?
YES
Repair open wire.
Go to paragraph 4–13.
NO
Go to step 8.
5. Remove relay (A330)K2–7/8
(TM 1-1520-238-23). Set and hold CKT A switch
in ENG 2 position. Check for 28 VDC between
(A330):
XK2–7/8–C1 and XK2–7/8–X2.
Is voltage present?
YES
Replace relay (A330)K2–7/8
(TM 1-1520-238-23).
NO
Go to step 7.
6. Release CKT A switch. Wait 5 seconds
minimum, then check for open between:
P46–17 and P46–19,
P46–17 and P46–18.
Does open exist?
YES
Replace relay (A330)K2–7/8
(TM 1-1520-238-23).
NO
Refer to TM 55-2840-248-23 to
troubleshoot engine ignition
system.
