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cooler and then returns to the lube module.
The lube module cleans the oil and controls the oil pressure.
These components supply data to the ECU:
* Oil pressure switch
* Oil level sensor
* Oil temperature sensor
* Generator filter pressure switch.
The oil goes to these areas:
* APU starter-generator
* Gearbox bearings and gears
* Turbine bearing compartment.
Scavenge
Scavenge pumps in the lube module send the oil from the
turbine bearing compartment back to the gear box reservoir.
Other scavenge pump elements send the scavenge oil from the
APU starter-generator through the scavenge filter and back to
the gearbox reservoir.
Vent
An air-oil separator separates the air that mixes with the oil in
the scavenge system. The air-oil separator is on the right side
of the lube module on the gearbox.
Air that goes by the bearing cavities and mixes with the
scavenge oil goes through the air-oil separator. Through
centrifugal action, the air-oil separator returns the oil to the
sump in the gearbox and the air vents overboard. The air vents
overboard through the APU exhaust duct.
Training Information Point
The air-oil separator is not a line replaceable component.
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Purpose
The APU oil indicating system supplies this data for the flight
compartment:
* Oil temperature (P5 panel amber FAULT light only)
* Oil pressure (P5 panel amber LOW OIL PRESSURE light
only)
* Oil level (P5 panel blue MAINT light and CDU display)
* Starter-generator scavenge filter clogged (P5 panel amber
APU FAULT light only).
General Description
The ECU receives APU oil indicating system inputs and
supplies this data to the airplane flight compartment.
The oil level indication only shows on the control display unit
(CDU). The blue MAINT light comes on at a specified oil
quantity.
Components
These are the APU oil indicating system components:
* Low oil pressure switch
* Oil temperature sensor
* Oil level sensor
* Filter pressure switch.
Low Oil Pressure Switch
The low oil pressure switch sends a signal to the ECU when the
oil pressure is less than 30-40 psi. If the APU speed is more than
95 percent, the ECU shuts down the APU after 20 seconds.
These amber lights come on for a low oil pressure indication:
* LOW OIL PRESSURE (P5)
* MASTER CAUTION (P7)
* APU annunciator (P7).
Oil Temperature Sensor
The oil temperature sensor sends lube oil temperature data to
the ECU. The ECU shuts down the APU if the APU speed is more
than 95 percent and oil temperature is 290F/143C or more. The
CDU shows the oil temperature.
These amber lights come on for a high oil temperature
indication:
* FAULT (P5)
* MASTER CAUTION (P7)
* APU annunciator (P7).
Oil Level Sensor
The oil level sensor sends the oil level data in the gearbox
sump to the ECU. The ECU sends this data to the CDU for
display.
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The ADD message shows on the APU oil quantity page of the
CDU when approximately 4.3 quarts (4.1 liters) of oil remains in
the APU sump.
The blue MAINT light on the P5 panel comes on and the LOW
message shows on the APU oil quantity page of the CDU when
approximately 3.8 quarts (3.6 liters) of oil remains in the APU
sump.
The APU sump holds 5.7 quarts (5.4 liters) of oil when full.
Filter Pressure Switch
The filter pressure switch monitors the differential pressure
between the inlet and outlet of the starter-generator scavenge
　
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