TM 1-1520-238-T-5
7–142
7–49.
SHAFT DRIVEN COMP INDICATOR – REMAINS LIGHTED AFTER APU START CYCLE
7–49
Tools:
Nomenclature
Part Number
Tool Kit, Aircraft
SC518099CLA01
Mechanic’s
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Thermometer, Digital
MIC-11CF
Degrees Celsius
Extractor, Relay
CTJ-RO6
Personnel Required:
67R
Attack Helicopter Repairer
68X
Armament/Electrical Systems Repairer
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
R200 panel removed
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 for open between (S132):
J1–1 and J1–3.
Does open exist?
YES
Go to step 2.
NO
Go to step 5.
2. Detach P217. Start and operate APU
(TM 1-1520-238-23). After 60 seconds of APU
operation, check for 28 VDC between P217–1
and P217–2.
Is voltage present?
YES
Go to step 3.
NO
Go to step 8.
3. On pilot ELEC PWR panel, set GEN 1 and GEN
2 switches to OFF/RESET. Attach P217. Set
GEN 1 switch to GEN 1 and GEN 2 switch to
GEN 2. On pilot ECS panel, set ENCU switch to
ON. Check for strong, steady air flow from ECS
vents.
Is airflow from ECS vents strong and steady?
YES
Go to step 11.
NO
Go to step 4.
4. Check air particle separator for obstructions.
Is air particle separator obstructed?
YES
Clear obstructions from air
particle separator.
(TM 1-1520-238-23).
Go to paragraph 7–45.
NO
Go to step 6.
5. Remove SDC oil temperature sensor
(TM 1-1520-238-23). Check for SDC oil
temperature above 340 F (171 C).
Is SDC oil temperature above 340 F
(171 C)?
YES
Replace SDC
(TM 1-1520-238-23).
NO
Replace SDC oil temperature
sensor (TM 1-1520-238-23).
6. Check SDC pressure interconnect hose and
surge valve pressure hose for cuts, tears, leaks
or obstructions.
Are hoses cut, torn, leaking or obstructed?
YES
Replace SDC pressure
interconnect hose and/or surge
valve pressure hose
(TM 1-1520-238-23).
NO
Go to step 7.
