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General Description
The APUC receives oil indicating system inputs and supplies this data to the AIMS to show on the MFD.
Oil indicating system data shows on the status display and on the APU maintenance page.
Protective Shutdowns
Low oil pressure, loss of oil pressure input, or high oil temperature will cause the APUC to do a protective shutdown when the APU is in the unattended mode.
Non-Normal Indications
The APU OIL QTY status message shows when the APU oil quantity is 3.8 quarts (3.5 liters) or less. This message also shows for an oil quantity/sump temperature sensor failure.
The APU status message shows for an oil temperature sensor failure.
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777 AIRCRAFT MAINTENANCE MANUAL

APU OIL INDICATING SYSTEM -INTRODUCTION

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APU OIL INDICATING SYSTEM -COMPONENTS

Oil Quantity/Sump Temperature Sensor
The oil quantity/temperature sensor is a capacitance-type sensor and is in the sump of the oil reservoir on the bottom of the APU gearbox. The sensor sends both oil quantity and oil temperature data to the APUC.
Oil Pressure Sensor
The oil pressure sensor sends oil system pressure data to the APUC. This sensor is on the lube cluster.
Low Oil Pressure Switch
The low oil pressure switch sends a low oil pressure signal to the APUC when APU oil pressure is below 30 to 40 psi. This switch is on the lube cluster.
Oil Temperature Sensor
The oil temperature sensor is a resistive type sensor. It sends oil temperature data to the APUC and is on the Lube cluster.
Oil Level Sight Gage
The oil level sight gage is on the right, front of the gearbox. The sight gage is part of the oil fill port.
Training Information Point
All APU oil sensors are LRUs. The sight gage and fill port are a single LRU.
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details. 

 

777 AIRCRAFT MAINTENANCE MANUAL

APU OIL INDICATING SYSTEM -COMPONENTS

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