TM 1-1520-238-T-4
6–104
Change 5
6–42.
OIL PSI ACC PUMP INDICATOR – LIGHTS
6–42
Tools:
Nomenclature
Part Number
Tool Kit, Aircraft
SC518099CLA01
Mechanic’s
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Tool Kit, Powertrain
SC518099CLA013
Repairer’s
Gage Pressure, Dial
GGG76
Indicating
(0-200 PSI)
Multimeter, Digital
AN/PSM-45
Personnel Required:
67R
Attack Helicopter Repairer
68D
Aircraft Powertrain Repairer/NDI
68X
Armament/Electrical Systems Repairer
References:
TM 1-1520-238-T-6
TM 1-1520-238-T-8
TM 1-1520-238-23
TM 1-1520-238-CL
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
L200 panel removed,
T250L, T250R,
T290R, and L325
access doors open
TM 1-1520-238-CL
APU operating
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 accessory drive lube pump oil bypass
screen for contamination.
Is contamination present?
YES
Clean accessory drive lube
pump oil bypass screen and
replace main transmission
accessory pump pressure
switch (TM 1-1520-238-23).
NO
Go to step 2.
2. Check pilot caution/warning panel.
Is GEN 2 indicator also lighted?
YES
Go to step 4.
NO
Go to step 3.
3. Shut down APU (TM 1-1520-238-23) and
(TM 1-1520-238-CL). Detach P755.
Does OIL PSI ACC PUMP indicator remain
lighted?
YES
Go to step 6.
NO
Go to step 5.
4. Check APU drive shaft (7).
Is shaft turning?
YES
Replace transmission
(TM 1-1520-238-23).
NO
Refer to TM 1-1520-238-T-8 to
troubleshoot APU.
5. Detach S20 SP1. Check for short between
J755–20 and ground.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 6–12.
NO
Go to step 7.
