TM 1-1520-238-T-5
8–105
8–37.
PILOT ENG–RTR RPM% INDICATOR VERTICAL SCALE INDICATORS – DO NOT
8–37
INDICATE 0%
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
TM 55-2840-248-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
LN1, RN1, 250L,
250R, 290R doors
opened
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 pilot ENG–RTR RPM% indicator vertical
display scales.
Does NP1 indicate 0%?
YES
Go to step 2.
NO
Go to step 3.
2. Check pilot ENG–RTR RPM% indicator vertical
display scales.
Does NP2 indicate 0%?
YES
Replace rotor speed sensor
(TM 1-1520-238-23).
NO
Go to step 3.
3. Detach P41.
Does NP1 indicate 0%?
YES
Refer to TM 55-2840-248-23
troubleshoot engine.
NO
Replace ENG–RTR RPM%
indicator (TM 1-1520-238-23).
4. Detach P42.
Does NP2 indicate 0%?
YES
Refer to TM 55-2840-248-23 to
troubleshoot engine.
NO
Replace ENG–RTR RPM%
indicator (TM 1-1520-238-23).
END OF TASK
