TM 1-1520-238-T-5
7–147/(7–148 blank)
7–53.
BOTH ENGINES – WILL NOT MOTOR TO 22% NG
7–53
Tools:
Nomenclature
Part Number
Tool Kit, Aircraft
SC518099CLA01
Mechanic’s
Gage Pressure, Dial
GGG76
Indicating
(0-200 PSI)
Coupling Half
AN-6027
Personnel Required:
67R
Attack Helicopter Repairer
References:
TM 1-1520-238-T-4
TM 1-1520-238-T-8
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
PAS inspection –
completed
Access provisions –
L325 door 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.
NOTE
Pressure reading on gage may fluctuate
slightly. Use average reading.
1. Check air particle separator for obstructions.
Is air particle separator obstructed?
YES
Clear obstructions from air
particle separator
(TM 1-1520-238-23).
NO
Go to paragraph 7–45.
2. Install dial pressure gage in utility air receptacle
(TM 1-1520-238-23). On ECS panel, set ECS
switch to ON and TEMP switch to COLD. On
pilot ANTI ICE panel, set DEFOG switch to OFF.
Start and operate APU (TM 1-1520-238-23).
Check for 25 psi or greater on dial pressure
gage.
Is pressure 25 psi or greater?
YES
Refer to TM 1-1520-238-T-4 to
troubleshoot power plants.
NO
Go to step 3.
3. Check dial pressure gage for pressure greater
than 0 psi.
Is pressure greater than 0 psi?
YES
Go to step 4.
NO
Replace SDC
(TM 1-1520-238-23).
4. Check cockpit defog air mixers for airflow.
Is airflow present at cockpit air mixers?
YES
Refer to TM 1-1520-238-T-8 to
troubleshoot Pitot anti–ice
system.
NO
Go to paragraph 7–49.
END OF TASK
