CREW CONTROLS AND INDICATORS (Auxiliary Power Unit [APU] Control Box)
ENGINE OIL PRESSURE Gage
Monitors APU engine oil pressure in pounds per square inch (psi). The gage is graduated in 10-
psi increments from 0 to 60 psi. Normal operating pressure ranges from 25 to 35 psi.
LOW OIL PRESS Lamp
This red lamp lights when a low oil pressure
condition exists in the APU lubricating system.
HIGH AIR TEMP Lamp
This red lamp lights when the APU overheats.
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