TM 1-1520-238-T-5
7–114
7–34.
ROTOR BRAKE – DOES NOT RELEASE
7–34
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 1-1520-238-23
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. With RTR BK switch set to OFF, check RTR
BRK circuit breaker.
Is circuit breaker open?
YES
Go to paragraph 7–33.
NO
Go to step 2.
2. Check for 28 VDC at P238–15.
Is voltage present?
YES
Go to step 5.
NO
Go to step 3.
3. Check for 28 VDC at P173–Z.
Is voltage present?
YES
Go to step 4.
NO
Repair open wire between
P173–Z and (A402)TB2–9–R.
Go to paragraph 7–21.
4. Check for open between P173–a and P238–15.
Does open exist?
YES
Repair open wire.
Go to paragraph 7–21.
NO
Replace pilot power quadrant.
(TM 1-1520-238-23).
5. Check for open between P238–14 and
GS630–B.
Does open exist?
YES
Repair open wire.
Go to paragraph 7–21.
NO
Go to step 6.
6. Remove rotor brake off solenoid
(TM 55–1520–238–23). Check for open between
(HP2):
J1–15 and J5–A,
J1–14 and J5–D.
Does open exist?
YES
Replace utility hydraulic
manifold (TM 1-1520-238-23).
NO
Replace rotor brake off solenoid
(TM 1-1520-238-23).
END OF TASK
