TM 1-1520-238-T-5
8–181
8–99.
PILOT VSI EDGE–LIGHTING – DOES NOT LIGHT
8–99
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer (2)
References:
TM 1-1520-238-T-6
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. Close pilot LT PRI circuit breaker.
Check for 5 VDC between (A326):
J16–B13 and J16–B14.
Is voltage present?
YES
Go to step 3.
NO
Go to step 2.
2. Check for 5 VDC at
(A326)TB1–33–E.
Is voltage present?
YES
Repair open wire between
(A326):
J16–B13 and TB1–33–E,
J16–B14 and TB1–34–E.
Go to paragraph 8–91,
or
replace resistor (A326)R24
(TM 1-1520-238-23).
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot pilot edge–lights.
3. Check for 5 VDC between
P120–2 and P120–3.
Is voltage present?
YES
Replace pilot vertical speed
indicator. (TM 1-1520-238-23).
NO
Repair open wire between
(A326):
P480–B14 and P120–3,
P480–B13 and P120–2.
Go to paragraph 8–91.
END OF TASK
