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distribution system has these systems:
* Supply system
* Scavenge system
* Vent system.
Supply System
Oil comes from the supply system to lubricate and cool internal
components in the engine.
From the oil tank, the oil flows to the lubrication unit through the
anti-leakage valve. In the lubrication unit, the supply pump
pressurizes the oil. The oil goes from the supply pump to the
supply oil filter. The supply oil filter is part of the lubrication unit.
The oil flows out of the lubrication unit in three lines to lubricate
these areas:
* Forward sump and transfer gearbox (TGB)
* Rear sump
* Accessory gearbox (AGB).
Scavenge System
The scavenge system takes the oil that collects at the lowest
point of these three areas:
* Forward sump
* Rear sump
* AGB and TGB.
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From these areas, the oil flows through three lines to three chip
detectors. Three scavenge pumps move the oil in the three
scavenge lines. The oil from each scavenge line 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. In
the exchanger, the oil cools as it heats the fuel. The oil flows
back through the servo fuel heater and then to the oil tank.
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From these areas, the oil flows through three lines to three
debris monitoring system (DMS) detectors. Three scavenge
pumps move the oil in the three scavenge lines. The oil from
each scavenge line 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. In the exchanger, the oil cools
as it heats the fuel. The oil flows back through the servo fuel
heater and then to the oil tank.
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The scavenge system also supplies hot oil to heat the
hydromechanical unit (HMU) servo fuel supply through the
servo fuel heater. See the engine fuel distribution system for
more information on the servo fuel heater. (SECTION 73-11)
Vent System
The vent system connects the oil tank with the forward sump.
There are also internal connections between the engine sumps
and gearboxes. The vent circuit bleeds out of the exhaust plug
at the rear of the engine.
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
79-20-00-010
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Component Locations
These components of the engine oil distribution system are on
the left side, and at the bottom of the fan case:
* Lubrication unit (7:00 position)
* Main oil/fuel heat exchanger (9:00 position)
* Oil scavenge filter assembly (8:00 position)
* Anti-leakage valve (6:00 position).
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The oil supply filter and the three chip detectors are in the
lubrication unit.
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The oil supply filter and the three debris monitoring system
(DMS) detectors are in the lubrication unit.
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You open the left fan cowl to get access to the components of
the engine oil distribution system.
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