777 AIRCRAFT MAINTENANCE MANUAL
APU ENGINE -INTRODUCTION
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APU ENGINE -TRAINING INFORMATION POINTS
Borescope Inspection Ports
Borescope inspection ports and access panels permit inspection of these components:
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Load compressor
*
Engine compressor
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Combustion chamber
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Turbine section.
Engine Manual Rotation
You can turn the APU engine main shaft with a wrench through a drive connection on the electric starter.
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777 AIRCRAFT MAINTENANCE MANUAL
APU ENGINE -TRAINING INFORMATION POINTS
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777 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
APU AND GENERATOR LUBRICATION SYSTEM -INTRODUCTION
Purpose
The APU lubrication system lubricates and cools these components:
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APU generator
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Air turbine starter (ATS)
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APU bearings
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APU gearbox.
Components
Some lubrication system components are on a common cluster on the front of the APU. These lubrication system components are not on the cluster:
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Magnetic chip collectors
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Oil cooler.
An 8.2 quart (7.8 liter) oil tank is inside the load gearbox. A sight gage shows the oil level. An oil fill port is adjacent to the gage.
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APU AND GENERATOR LUBRICATION SYSTEM -INTRODUCTION
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APU AND GENERATOR LUBRICATION SYSTEM -LUBE CLUSTER -INTRODUCTION
General
The lube cluster contains many of the lubrication system components. It is on the gearbox on the front of the APU.
Components
The lube cluster contains lube and scavenge pump elements internally. A shaft from the gearbox turns the pumps. A pressure regulating/relief valve is also internal to the lube cluster.
These components are on the outside of the lube cluster and are LRUs:
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Generator scavenge magnetic chip collector
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Filter bypass valve and indicating switches
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Oil and generator scavenge filters
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Low oil pressure switch
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Oil pressure sensor
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Oil temperature sensor
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Thermostatic bypass valve.
A test port permits you to attach a pressure gage to the lube cluster to do a check of the output pressure.
Training Information Point
The fuel cluster mounts to the lube cluster. To remove the lube cluster, you must first remove the fuel cluster.
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APU AND GENERATOR LUBRICATION SYSTEM -LUBE CLUSTER -INTRODUCTION
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APU AND GENERATOR LUBRICATION SYSTEM -LUBE CLUSTER -FUNCTIONAL DESCRIPTION
Lube and Scavenge Pumps
The lube and scavenge pump elements are on a common shaft driven by the gearbox. Three of the elements are lube pump elements. Three elements are generator scavenge pump elements and two are APU scavenge elements.
Pressure Regulating/Relief Valve
The pressure regulating/relief valve keeps the oil pressure at 65 to 75 psi. If pressure is more than this range, the valve returns the oil to the oil pump inlet.
Thermostatic Bypass Valve
The thermostatic bypass valve controls the oil flow to the oil cooler to control oil temperature and to bypass the oil cooler when the oil is cold.
When the oil temperature is 60C (140F) or less, the valve is fully open and the oil does not go to the oil cooler. When the oil temperature is 77C (170F) or more, the valve is fully closed and the oil goes to the oil cooler. Between 60C (140F) and 77C (170F), the valve will be partially open.
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