-
the aircraft altitude is more than 20,000 ft
 or

 -
the fuel temperature is below -12.2 deg.C (+10.04 deg.F).

 The oil lubricates and cools the following components:

 -
the APU generator,

 -
the cooling fan,

 -
the gearbox gears and bearings,

 -
the forward bearing and the turbine bearing. Gravity returns the scavenge oil from the gearbox gears and the bearings to the oil reservoir. Two scavenge pumps scavenge oil from the turbine sump and the generator sump and return it to the oil reservoir. The scavenge oil from the generator sump is filtered before it enters the reservoir.

 If the pump pressure exceeds a given value, the pressure regulating valve opens and returns the excess oil into the oil reservoir.
 If the oil cooler is blocked, or the oil does not pass through as it should, the pressure relief valve opens and relief the oil back to the suction side of the pressure pump.

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-91-00Page 9 201-210, Config-2 Aug 01/05
 CES  STORAGE AND DISTRIBUTION - DESCRIPTION AND OPERATION

____________________________________________________
 1. General
_______ The oil storage and distribution system supplies filtered, temperature and pressure regulated oil to:
 -
the engine,

 -
the APU generator.
 The system has:

 -
an integral oil reservoir with a magnetic chip detector, an oil level sensor and an oil level sight glass,

 -
an oil pressure pump,

 -
two oil scavenge pumps,

 -
two oil filters,

 -an oil cooler,
 -a de-oiling valve.
 The APU has an integral lubrication system that lubricates and cools:

 -
the power section,

 -
the load compressor,

 -
the accessory gearbox,

 -
the generator.

 2. Component Location
__________________
 (Ref. Fig. 001)

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------
SWITCH and INDICATOR - DIFF.PRESS/ GENERATOR SCAVANGE  315 316  315AL 316AR 49-91-21
 SWITCH and INDICATOR - DIFF.PRESS/ OIL PUMP  315 316  315AL 316AR 49-91-23
 FILTER - OIL, PRESSURE  315 316  315AL 316AR 49-91-41
 FILTER - OIL, GENERATOR SCAVANGE  315 316  315AL 316AR 49-91-41
 DRAIN PLUG - MAGNETIC  315  315AL  49-91-42
 316  316AR
 VALVE - PRESSURE RELIEF  315  315AL  49-91-43
 316  316AR
 OIL COOLER  315  315AL  49-91-44
 316  316AR
 VALVE - SOLENOID, DE-OILING  315 316  315AL 316AR 49-91-49
 SENSOR - TEMPERATURE, HIGH OIL  315 316  315AL 316AR  49-91-51

 Oil System - Component Location
 Figure 001 (SHEET 1)

 CES

 Oil System - Component Location
 Figure 001 (SHEET 2)

 CES

 3. System Description__________________ (Ref. Fig. 001, 002)
 A. Storage
 (1)
 The lower part of the accessory drive gearbox (Ref. 49-26-00) is the integral oil reservoir of the APU. You can fill the oil reservoir by gravity fill. The gravity fill port is installed on the left side of the gearbox. The scupper prevents that oil flows on to the APU and into the APU compartment during the gravity oil fill. You can read the oil level on the oil sight glass. It must be between the FULL and the ADD mark. The oil quantity of the gearbox sump at:

 -
the FULL mark is 5.43 l (1.4344 USgal),

 -
the ADD mark is 3.95 l (1.0434 USgal).
 The difference between the two marks is 1.48 l (0.3909 USgal).

 (2)
 When the oil level is too low, the low oil level sensor transmits a signal to the ECB 59KD (Ref. 49-93-00). With the APU not started and the aircraft on the ground the APU system page of the Electronic Instrument System (EIS) shows the LOW OIL LEVEL advisory message. Nothing is shown if the oil quantity is more than the set minimum.

 (3)
 The oil reservoir has a connection to the ambient air through an air/oil separator. The air/oil separator is connected through a gearbox vent line to the APU exhaust cone.

 (4)
 The oil drain plug is installed at the lowest point of the integral oil reservoir. The electrical chip detector is installed in the drain plug. You can remove the drain plug with the chip detector installed. You can also remove the chip detector without the drain plug. The drain plug has a check valve which closes when you remove the chip detector. Thus it is not necessary to drain the oil reservoir for a visual check of the chip detector.
　
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