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The sumps are sealed with labyrinth type oil seals, which must be pressurized in order to ensure that the oil is retained within the oil circuit and, therefore, minimize oil consumption.
Pressurization air is extracted from the primary airflow (booster discharge) and injected between the two labyrinth seals. The air, looking for the path with the least resistance, flows across the oil seal, thus preventing oil from escaping.
Any oil that might cross the oil seal is collected in a cavity between the two seals and routed to drain pipes.
Once inside the oil sump cavity, the pressurization air becomes vent air and is directed to an air/oil rotating separator and then, out of the engine through the center vent tube, the rear extension duct and the flame arrestor.

EFG

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CTC-201-274-00
EFFECTIVITY
79-00-00 Page 3
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
OIL GENERAL
The purpose of the oil system is to provide lubrication and cooling for gears and bearings located in the engine sumps and gearboxes.
It includes the following major components:
-An oil tank, located on the left handside of the fan
case.

-
 An antisiphon device, close to the oil tank cover, on
the left hand side of the tank.

-
 A lubrication unit assembly, installed on the
accessory gearbox.

-
 A master chip detector, installed on the lubrication
unit.

-
 A main oil/fuel heat exchanger, secured on the
engine fuel pump.

 

EFG
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CTC-201-178-01
EFFECTIVITY
79-00-00 Page 5
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
OIL GENERAL
The oil system is self contained and may be split into the different circuits listed below:
-
Oil supply circuit.

-
Oil scavenge circuit.

-
Oil circuit venting.

 

EFG

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CTC-201-180-02
EFFECTIVITY
79-00-00 Page 7
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
OIL GENERAL
Oil supply circuit.
The oil is pumped from the oil tank, through an antisiphon device, by a pressure pump within the lube unit.
The oil then passes through the main filter to be distributed to the engine sumps and gearboxes.
There is a back-up filter, in case of main filter clogging.
The following parameters are used for aircraft indicating purposes:
　
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