TM 1-1520-238-T-6
9–682
9–354. APU FIRE PULL INDICATOR – DOES NOT LIGHT WITH PRESS TO TEST INDICATOR
9–354
PRESSED
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
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. Check for 28 VDC at P176-V.
Does open exist?
YES
Go to step 3.
NO
Go to step 2.
2. Check for 28 VDC at (A76)J1-E.
Does open exist?
YES
Repair open wire between:
P463-E and P429-A6,
P438-B2 and P176-V,
(A326)J23-A6 and
(A326)TB2-5-G,
(A326)TB2-5-H and
(A326)J15-B2.
Go to paragraph 9–333.
NO
Go to paragraph 9–263 to
troubleshoot dc emergency bus
– pilot station.
3. Press and hold PRESS TO TEST switch, check
for open between P176-U and ground.
Does open exist?
YES
Go to step 4.
NO
Replace APU FIRE PULL
indicator (TM 1-1520-238-23).
4. Check for open wire between P176-U and
P748-x.
Does open exist?
YES
Repair open wire between:
P176-U and P438-B12,
P429-A1 and P748-x.
(A326)J15-B12 and
(A326)TB2-12-B,
(A326)TB2-12-A and
(A326)J23-A1.
Go to paragraph 9–333.
NO
Replace multi-channel dimming
controller (TM 1-1520-238-23).
END OF TASK
