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Oil from the oil tank flows across the anti-siphon device, through its main orifice.
During engine operation, the downstream oil pressure from the supply pump enters the anti-siphon device, through a restrictor.
During engine shutdown, sump air pressure is able to enter the anti-siphon device and inhibit the oil supply flow.

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CTC-201-188-02
EFFECTIVITY
79-20-00 Page 3
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
THIS PAGE INTENTIONALLY LEFT BLANK

EFG
LUBRICATION UNIT

EFFECTIVITY
79-21-10 Page 1
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
LUBRICATION UNIT
The lubrication unit has two purposes:
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It pressurizes and filters the supply oil for lubrication
of the engine bearings and gears.

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It pumps in scavenge oil to return it to the tank.

It is installed on the left hand side of the AGB front face.
Externally, the lubrication unit has:
-A suction port (from the oil tank).
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 Four scavenge ports (aft & fwd sumps, TGB,  AGB).

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 Four scavenge screen plugs.

-An oil out port (to master chip detector).
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 A main oil supply filter.

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 A back-up filter.

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 Pads for the oil temperature sensor and the oil
differential pressure switch.

 

Internally, it has 5 pumps driven by the AGB, through a single shaft. One pump is dedicated to the supply circuit and four pumps to the scavenge circuits.

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CTC-201-189-01   LUBRICATION UNIT INTERFACE 
EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321 CFMI PROPRIETARY INFORMATION
 79-21-10 ENGINE SYSTEMS  Page 3 Jan 03 

CFM56-5B TRAINING MANUAL
EFG
LUBRICATION UNIT
Supply circuit.
During supply, oil from the oil tank is pressurized through the supply pump and then goes to the main supply filter.
In case of clogging of the main supply filter, a by-pass valve directs the oil flow to a self-cleaning back-up filter, installed in parallel.
Filter clogging indication is provided to the cockpit, through a transmitter.
A pressure relief valve, installed downstream from the supply pump, redirects the oil to the scavenge circuit when oil pressure reaches a maximum limit value.
Downstream from the supply filter, the oil flows through three outlets to the engine sumps.
　
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