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* Indicating.
Abbreviations and Acronyms
* AGB - accessory gear box
* AMM - airplane maintenance manual
* CDS/DEU - common display system/ display electronic units
* EEC - electronic engine control
* psid - pound-per-square-inch differential
* TGB - transfer gear box
* T/P sensor - temperature/pressure sensor
ENGINE OIL - INTRODUCTION
EFFECTIVITY
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ENGINE OIL - INTRODUCTION
ENGINE OIL - INTRODUCTION
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General
The engine oil system has these subsystems:
* Storage
* Distribution
* Indicating.
Storage
The oil storage system keeps sufficient oil for a continuous
supply to the oil distribution circuit. The oil storage system lets
you do an oil level check and to fill the oil system.
The oil storage system holds oil in the oil tank.
Distribution
The oil distribution system has these circuits:
* Supply
* Scavenge
* Vent.
The supply circuit sends oil to lubricate the engine bearings and
gears. Oil from the tank goes to the lubrication unit through an
anti-leakage valve. The lubrication unit pressurizes and filters
the oil. The oil then goes to the engine.
The scavenge circuit takes the oil from the engine. Oil first flows
through the lubrication unit. The lubrication unit also scavenges
the oil. The oil goes to the scavenge oil filter and then to the
servo fuel heater. The oil goes from the servo fuel heater to the
main oil/fuel heat exchanger and then back to the servo fuel
heater. Then the oil flows back to the oil tank.
The vent circuit balances the internal air pressures in the oil
system. Externally, a vent line connects the engine to the oil
tank. Unwanted air pressure goes out of the oil tank through the
vent line.
Indication
The oil quantity indicating system sends this data to the display
electronic units (DEUs):
* Scavenge oil filter bypass indication
* Low oil pressure indication
* Oil pressure
* Oil temperature
* Oil quantity.
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EFFECTIVITY
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ENGINE OIL - GENERAL DESCRIPTION
ENGINE OIL - GENERAL DESCRIPTION
EFFECTIVITY
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ENGINE OIL - GENERAL DESCRIPTION
ENGINE OIL - GENERAL DESCRIPTION
EFFECTIVITY
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ENGINE OIL - GENERAL DESCRIPTION
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
These are the functions of the engine oil tank:
* Contains the engine oil
* Removes the air from the scavenge oil
* Lets you do an oil level check and fill the oil system.
Component location
The engine oil tank is on the fan case, at the 3:00 position. You
do the oil level check and you fill the oil tank through the oil tank
access door. The oil tank access door is on the side of the right
fan cowl. You can also open the right fan cowl to get access to
the oil tank.
Physical Description
The oil tank has a oil level sight gage, a gravity fill port, and
pressure servicing fill ports.
You use the oil level sight gage on the oil tank to make a visual
check of the engine oil quantity. The oil level sight gage is on
the front of the oil tank.
You use the oil tank gravity fill port to fill the oil tank. The gravity
fill port is on the right of the oil tank. The oil filler cap has a
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