Oil Fill Ports, Visual Quantity Indicator and Magnetic Drain Plug Figure 003
R EFF : 001-003, 051-099, 401-499, 49-91-00Page 10 Config-1 Aug 01/05
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G. Oil Filler Ports (Ref. Fig. 003) The APU has a gravity fill port and a pressure fill port installed on the left side of the gearbox. You can put oil into the APU through either of the two fill ports.
H. Oil Sight Glass (Ref. Fig. 003) The oil sight glass is installed on the left side of the gearbox. It includes a glass sheet that is sandwiched and sealed. The plate has a hole to permit vision of the oil through the glass. ADD and FULL marks on the plate show when oil must be added through one of the two fill ports.
6. Operation/Control and Indication
________________________________ (Ref. Fig. 002) When the APU start sequence is initiated (Ref. 49-42-00) the mechanically driven oil pressure pump removes the oil from the oil reservoir by suction. The oil passes to the oil cooler, then to the filter which retains any particles contained in the oil. If the oil sump temperature is below -6.7.C (20.F) the ECB energizes the de-oiling solenoid valve during the start sequence between 0% and 60% APU speed. Thus opens the valve and air enters the oil pressure pump to reduce the load on this pump. The solenoid valve also opens when:
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the APU speed is between 95% and 7% during the APU shutdown sequence,
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the aircraft altitude is more than 30.000 ft.
The oil lubricates and cools the following components:
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the AC APU generator and its splines,
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the cooling fan splines,
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the gearbox gears and bearings,
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the forward bearing and the bearings of the rotation groub. The gravity returns the scavenge oil from the gearbox splines, the gearbox gears and the bearings to the oil reservoir. Two mechanically driven scavenge pumps removes the scavenge oil from the turbine sump and the generator sump and returns 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 the oil cooler is blocked, the oil does not pass as quickly as it should, the pressure relief valve opens and relief the oil back to the suction side of the pressure pump.
STORAGE AND DISTRIBUTION - DESCRIPTION AND OPERATION
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1. General_______ The oil storage and distribution system supplies filtered, temperature and pressure regulated oil to:
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the APU,
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the APU generator.
The system has:
-an integral oil reservoir (gearbox sump) with a magnetic chip detector,
-a lube module,
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two oil filters,
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two differential-pressure switches,
-an oil cooler,
-a de-oil solenoid,
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an oil-sump temperature sensor.
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an oil heater,
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a low oil level switch
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a low oil pressure switch.
The gearbox sump is a wet sump which is also the integral oil reservoir. The
generator and the turbine sumps are scavenged sumps.
2. Component Location__________________ (Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------SWITCH - DIFF. PRESS, GENERATOR 315 315AL/ 49-91-14 SCAVENGE 316AR SWITCH - DIFF. PRESS, OIL PUMP 315 315AL 49-91-15 FILTER - OIL 316 316AR 49-91-41 DRAIN PLUG - MAGNETIC 315 315AL 49-91-42 COOLER - OIL 315 315AL/ 49-91-44 316AR LUBE MODULE 315 315AL 49-91-45 BYPASS VALVE - OIL FILTER 316 316AR 49-91-47 VALVE - SOLENOID, DE-OILING 316 316AR 49-91-49 SENSOR - TEMPERATURE, OIL SUMP 315 315AL 49-91-51
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Oil System - Component Location
Figure 001 (SHEET 1)
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Oil System - Component Location
Figure 001 (SHEET 2)
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3. System Description__________________ (Ref. Fig. 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 or with a pressure fill device. The gravity fill port, the pressure fill port and the pressure fill overflow port are installed on the engine left side. 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 at the FULL mark is 6.26 l (1.6537 USgal). During the gravity fill procedure, the filler is big enough to hold a quart can.
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