-Oil temperature.
-Main filter clogging.
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ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
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OIL GENERAL
Oil scavenge circuit.
The oil is drawn from the forward and aft sumps, the AGB and the TGB, by individual scavenge pumps, installed within the lube unit.
The oil passes through scavenge screens and then crosses a Master Chip Detector (MCD). This unit provides the first visual indication of contamination in the oil.
Finally, the oil goes through a scavenge filter to the servo fuel heater and passes into the main oil/fuel heat exchanger, before returning to the oil tank.
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ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
OIL GENERAL
Oil circuit venting.
A venting system links the oil tank, the engine sumps and gearboxes, in order to vent the air from the scavenge pumps and balance pressures between the different areas.
A dedicated pipe connects the forward and aft sumps for oil vapor collection and sumps pressure balancing.
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ENGINE SYSTEMS Jan 03
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OIL TANK
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ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
OIL TANK
The oil tank stores the engine oil and is installed on the fan case, at the 8 o’clock position, on one upper and two lower mounts with shock absorbers.
The tank body is made of light alloy covered with a flame resistant coating to meet fireproof requirements. Five inner bulkheads add strength and reduce oil sloshing.
The cover is a light alloy casting, bolted on the oil tank body.
The tank has an oil inlet tube from the exchanger, an oil outlet to the lubrication unit and a vent tube.
To replenish the oil tank, there are a gravity filling port, a remote filling port and an overflow port.
A scupper drain ducts any oil spillage to the drain mast and a plug is provided for draining purposes.
The tank has a pressure tapping connected to a low oil pressure switch and oil pressure transmitter, that are used in cockpit indicating. Next to this tapping, there is another which is similar and only used for test cells.
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