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A pressure difference of 60 psi also opens the valve to permit the oil to continue to flow if the oil cooler clogs.
Oil Filter Elements
There are two interchangeable oil filters. The scavenge oil from the APU generator goes through one filter. Pressurized oil goes through the other filter after it goes through the oil cooler.
Filter Bypass Valves and Indicating Switches
Both filters have an indicating switch and a bypass valve to monitor for filter clogs and to allow the oil to flow if there is a clog. When there is a pressure difference of more than 30 to 40 psi across the filter, the switch closes and sends a signal to the APUC. The Filter begins to bypass oil at approximately 50 psid.
Oil Pressure Sensor
The oil pressure sensor sends lube oil pressure data to the APUC.
Oil Temperature Sensor
The oil temperature sensor sends lube oil temperature data to the APUC.
Low Oil Pressure Switch
The low oil pressure switch sends a signal to the APUC when the oil pressure is less than 30-40 psi.
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APU AND GENERATOR LUBRICATION SYSTEM -LUBE CLUSTER -FUNCTIONAL DESCRIPTION
Generator Scavenge Magnetic Chip Collector
This chip collector is in the scavenge oil flow from the APU generator. A screen filters the oil flow after it goes by the magnetic tip.
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APU AND GENERATOR LUBRICATION SYSTEM -LUBE CLUSTER -FUNCTIONAL DESCRIPTION

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APU AND GENERATOR LUBRICATION SYSTEM -MAGNETIC CHIP COLLECTORS

Purpose
Magnetic chip collectors collect metallic particles in the engine oil. This permits you to do an inspection of the APU for damage.
Location
These are the five chip collectors on the APU:
*
ATS chip collector -on the lower side of the air turbine starter

*
Generator scavenge chip collector -on the lube cluster

*
Turbine bearing chip collector -on the left forward side of the load gearbox

*
Mid-bearings chip collector -on the left forward side of the load gearbox inboard of the turbine bearing chip collector

*
Sump drain chip collector -on the forward side of the load gearbox in the center.

Physical Description
The magnetic chip collectors have magnets inside them to collect the metal chips.
All the chip collectors are the same. They are in adapters which are also removal check valves. The check valves close to prevent oil loss when you remove the chip collector.
Some removal check valves are inside screens. The screens stop large metal particle movement through the lubrication system.
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APU AND GENERATOR LUBRICATION SYSTEM -MAGNETIC CHIP COLLECTORS

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APU AND GENERATOR LUBRICATION SYSTEM -OIL COOLER

General
The oil cooler is a stainless steel air/oil heat exchanger. Compartment air cools the pressurized oil after the oil leaves the oil pump.
The oil cooler is on the left side of the APU turbine case. It is part of the exhaust eductor cooling system.
Functional Description
The APU exhaust causes a suction of air. This causes APU compartment air to move through the oil cooler to cool the APU oil. The cooling air then flows overboard through the exhaust duct.
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APU AND GENERATOR LUBRICATION SYSTEM -OIL COOLER

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APU AND GENERATOR LUBRICATION SYSTEM -FUNCTIONAL DESCRIPTION

General
The APU and generator lubrication system supplies pressurized oil to cool and lubricate APU components and the APU generator. A scavenge system returns the oil to the gearbox reservoir.
Supply
Oil pump elements in the lube cluster pump oil from the gearbox reservoir. Pressurized oil from the lube cluster goes to the oil cooler and then returns to the lube cluster.
The lube cluster cleans the oil and regulates the oil pressure. Oil pressure and temperature sensors supply data to the APUC.
The oil then goes to the these components:
*
APU generator

*
Air turbine starter (ATS)

*
Gearbox bearings and jets

*
Load compressor bearings

*
Midframe bearing compartment
　
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