TM 9-2350-287-10ItemNo.202122Table 2-1. Preventive Maintenance Checks and Services for Model M992A1IntervalDuringDuringDuringLocationItem toCheck/ServicePower-packAuxiliaryPower UnitAPU)HydraulicGages/LinesCrewmemberNot Fully MissionProcedureCapable If:DRIVERCheck for unusual noises orvibrations.CREWMEMBERPerformance orfunction inade-quate; unusualnoises or vibrationsinoperative.Open APU front door and checkAPU engine oil level. Add oil tobring level up to full (F) mark on dipstick. Add or drain as needed. StallAPU (p. 2-118). Check for operationof unit.CREWMEMBERa. Apply system pressure by activa-ting APU unit.b. Check gages for normal indica-tions when operating hydraulicsystem:Change 12-43
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