TM 1-1520-238-T-5
7–122
7–41.
TWHL LOCK CIRCUIT BREAKER (CB59) – DOES NOT STAY CLOSED
7–41
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Extractor, Relay
CTJ-RO6
Personnel Required:
68X
Armament/Electrical Systems Repairer
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. Open TWHL LOCK circuit breaker. Check for
short between P1–15 and ground.
Does short exist?
YES
Repair shorted wire between
(A76)P1–15 and CB59.
Go to paragraph 7–21.
NO
Go to step 2.
2. Identify and detach wires from (A402): TB2–9–A,
TB2–9–B, TB2–9–C, and TB2–9–D. Check for
short between (A402):
J1–15 and ground,
J24–A6 and ground,
J27–A6 and ground,
J5–A1 and ground.
Does short exist?
YES
Repair shorted wire between
(A402):
J1–15 and TB2–9–D,
J27–A6 and TB2–9–B,
J5–A1 and TB2–9–C.
Go to paragraph 7–21.
NO
Go to step 3.
3. Check for short between P441–A6 and ground.
Does short exist?
YES
Go to step 4.
NO
Go to step 7.
4. Check for short between P527–A15 and ground.
Does short exist?
YES
Go to step 5.
NO
Go to step 6.
5. Detach P754. Check for short between
P527–A15 and ground.
Does short exist?
YES
Repair shorted wire between
P527–A15 and P754–A.
Go to paragraph 7–21.
NO
Replace tail wheel lock control
valve (TM 1-1520-238-23).
