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CFMI PROPRIETARY INFORMATION
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79-21-10 Page 11
ENGINE SYSTEMS Jan 03
EFG LUBRICATION UNIT  CFM56-5B  TRAINING MANUAL 
Pump design principle. 
The five pumps are positive displacement pumps, powered by a single shaft. 
Their design consists of two rotor gears rotating in an eccentric ring. 
The outer gear (driven gear) has one tooth more than the inner gear (driver gear). The gears rotate in the same direction, but with different angular speeds. 
The volume corresponding to the missing tooth is, therefore, displaced from the inlet to the outlet. 
Since the two gears rotational axes are offset, the area between two teeth profiles increases up to a maximum volume during half a turn. 
During this first half cycle, the increased volume creates a vacuum and pumps in the oil from the inlet orifice. 
During the second half cycle, the volume decreases between the teeth, causing the oil to be discharged through the outlet port. 
EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321 CFMI PROPRIETARY INFORMATION  79-21-10 ENGINE SYSTEMS  Page 12 Jan 03 

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CTC-201-192-00
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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
LUBRICATION UNIT
Lube unit internal lubrication.
Internally, the lube unit is lubricated with supply pump outlet oil, which flows within the drive shaft of the unit.
The oil flow lubricates the external splines of the shaft aft end, via two calibrated holes, and then circulates towards the AGB.
The AGB mounting pad has no carbon seal.
The lube unit has an O-ring for sealing purposes.

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ALL CFM56-5B ENGINES FOR A319-A320-A321

ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG

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MASTER CHIP DETECTOR

EFFECTIVITY

79-21-50 Page 1
ALL CFM56-5B ENGINES FOR A319-A320-A321

ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
MASTER CHIP DETECTOR
The Master Chip Detector (MCD) collects magnetic particles suspended in the oil that flows from the common outlet of the four scavenge pumps.
It is installed on the lubrication unit and is connected to an oil contamination pop-out indicator, through the DPM wiring harness.
　
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