Figure 25.
APU Terminal 65 and R Test Point.
Many factors contribute to difficulty in starting an engine. In this part
of the subcourse, you will learn the troubleshooting steps to take when an
engine is hard to start under normal conditions and during cold weather
conditions (0 to -65 degrees F).
Again, always place emphasis on whether
sufficient air, fuel, compression/ignition, and in the case of hard
starting, sufficient cranking power must be available.
Without these key
ingredients, difficulty in engine operation will always be present.
The following troubleshooting steps apply when experiencing difficulty in
starting the APU engine under normal conditions:
o
Ensure you use the grade of oil recommended by LO 9-2350-267-12,
for the temperature the equipment is exposed to.
o
Open the two fuel filter drain cocks and set the MASTER and FUEL
SHUT OFF switches to the ON position.
Be sure to place a
suitable container under the filter drain hoses to collect any
water or contaminated fuel that flows from the drain hoses. When
clean fuel begins to flow, turn off the MASTER and FUEL SHUT OFF
switches and close the fuel filter drain cocks.
o
Check for dirty or clogged fuel filters and replace fuel filter
elements if they are dirty.
24
OD1702
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