TM 1-1520-238-T-4
Change 5
6–157
6–78.
TEMP INT INDICATOR – LIGHTS
6–78
Tools:
Nomenclature
Part Number
Tool Kit, Aircraft
SC518099CLA01
Mechanic’s
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Tester, Pyrometer and
TH–299
Thermocouple
Personnel Required:
67R
Attack Helicopter Repairer
68X
Armament/Electrical Systems Repairer
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
TM 1-1520-238-CL
Equipment Conditions:
Ref
Condition
TM 1-1520-238-CL
Engine 1 operating
TM 1-1520-238-23
Access provisions –
L510, R510
fairings removed
After engine
shutdown, L545,
R545 covers and
L200, R295 access
doors 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. Place PWR lever to FLY. Operate until TEMP
INT indicator lights. Shut down engine
(TM 1-1520-238-CL). Immediately hold tester
wand against each of four IGB thermistor bosses
in turn and record temperature readings.
Is any reading above 140 C?
YES
Replace IGB
(TM 1-1520-238-23)
NO
Go to step 2.
2. Check intermediate gearbox grease level
(TM 1-1520-238-23).
Is grease level within limits?
YES
Go to step 3.
NO
Service gearbox
(TM 1-1520-238-23).
3. Detach P200.
Does TEMP INT indicator remain lighted?
YES
Go to step 5.
NO
Go to step 4.
4. Check resistance between P200–S and
P200–C.
Is resistance greater than 1 megohm?
YES
Go to step 7.
NO
Go to step 6.
5. Check for short between P200–S and P18–26.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 6–13.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot the pilot
caution/warning system.
