TM 9--2350--292--20--10187 00--1450187 00PREVENTIVE MAINTENANCE CHECKS AND SERVICES INCLUDINGLUBRICATION INSTRUCTIONS -- CONTINUEDTABLE 3 PREVENTIVE MAINTENANCE CHECKS AND SERVICESINCLUDING LUBRICATION INSTRUCTIONS, SEMIANNUALLY -- CONTINUEDITEMNO.NOT FULLYMISSIONCAPABLEIF:PROCEDURELOCATIONITEM TOCHECK/SERVICEINTERVALSEMIANNUALLYEXTERIOR55Auxiliary PowerUnit (ONAN) --Continuedc. Replace primary fuel filter (4)(WP 0609 00).d. Replace secondary fuel filter (5)(WP 0609 00).e. Tighten fuel and oil connections thatleak.f. Inspect air system components;replace if damaged or deteriorated.g. Service air cleaner. Check forcleanliness and obstructions. Replace filterif damaged (WP 0608 00). Clean if dirty(TM 9--2350--292--10).h. Start APU engine(TM 9--2350--292--10). Listen for unusualnoises in engine and generator whichmight indicate improper operation.i. Observe warning lights and oil pressuregauge to see if unit is functioning properly(TM 9--2350--292--10). Oil pressure gaugeshould indicate approximately 30 to 45 psi(207 to 310 kPa).j. Shut off APU engine(TM 9--2350--292--10).Any fuelleaks.Dirty orobstructed aircleaner.Any unusualnoises.Malfunctioninglights or lowpressure.EMERGENCY FUELSHUT--OFFPRIMARY SECONDARYFUEL FILTERSAUX. POWER UNIT54
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