TM 1-1520-238-T-4
6–101
6–39.
HIGH RPM ROTOR INDICATOR – LIGHTS
6–39
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68F
Aircraft Electrician
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
L140 access fairing
open
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. Detach P20.
Does pilot HIGH RPM ROTOR indicator
remain lighted?
YES
Refer to TM 1-1520-238-T-6 to
troubleshoot the pilot
caution/warning system.
NO
Go to step 2.
2. Detach P31.
Does CPG HIGH RPM ROTOR indicator
remain lighted?
YES
Refer to TM 1-1520-238-T-6 to
troubleshoot the CPG
caution/warning system.
NO
Go to step 3.
3. Detach P49 and check short between:
P20–Y and ground,
P49–17 and ground.
Does short exist?
YES
Repair shorted wire between:
P20–Y and P482–A2,
P435–A10 and P49–17.
(A326):
J18–A2 and TB1–10–B,
TB1–10–B and J7–A10.
Go to paragraph 6–12.
NO
Go to step 4.
4. Check for short between P31–Y and ground.
Does short exist?
YES
Repair shorted wire between:
P31–Y and P482–A12,
P435–A10 and P49–17.
(A326):
J18–A12 and TB1–10–C,
TB1–10–A and J7–A10.
Go to paragraph 6–12.
NO
Replace engine out warning unit
(TM 1-1520-238-23).
END OF TASK
