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The oil goes to the supply oil filter. The supply oil filter bypass
valve monitors the pressure difference across the supply oil
filter. If the filter clogs, the valve opens. The pop-out indicator
shows a red button before the supply oil filter bypass valve
opens.
The oil flows through these supply lines:
* Rear sump
* Accessory gearbox (AGB)
* Transfer gearbox (TGB) and forward sump.
An oil pressure line from the rear sump supply line sends
pressurized oil to the anti-leakage valve. That keeps the valve
open.
Scavenge Circuit
GUN 001-099, 101-115
From the engine sumps and gearboxes, the scavenge oil flows
through chip detectors. There is one chip detector for each of
these scavenge lines:
* Rear sump
* AGB and TGB
* Forward sump.
GUN 201-999
From the engine sumps and gearboxes, the scavenge oil flows
through three debris monitoring systems (DMS) detectors.
There is one DMS detector for each of these scavenge lines:
* Rear sump
* AGB and TGB
* Forward sump.
GUN ALL
The check valves prevent leakage when you remove a detector.
GUN 201-999
The DMS detectors send debris data through the DMS box to
the electronic engine control (EEC). The EEC sends this data to
the FMC. The flight management computer (FMC) shows debris
messages in the EEC maintenance pages of the control display
unit (CDU).
GUN ALL
The oil goes to the three scavenge pumps. Each pump moves
the oil in one scavenge line.
ENGINE OIL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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79-20-00-090
The oil from the three scavenge lines goes to the scavenge oil
filter. The scavenge oil filter bypass valve opens if the pressure
difference across the scavenge oil filter is above limits.
The filtered oil flows through the servo fuel heater then through
the main oil/fuel heat exchanger. A bypass valve is in the main
oil/fuel heat exchanger. If the heat exchanger clogs, the bypass
valve opens and the servo fuel heater and the main oil/fuel heat
exchanger are bypassed. The oil goes back to the servo fuel
heater then to the oil tank.
Vent Circuit
A vent line connects the oil tank with the forward sump.
Internally, the AGB and the TGB also connect with the forward
sump. The forward sump and the rear sump vent out through
the turbine exhaust plug at the rear of the engine.
See the turbine exhaust system chapter for more information on
the turbine exhaust plug. (SECTION 78-11)
ENGINE OIL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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79-20-00-090
ENGINE OIL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
ENGINE OIL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-115 79-20-00
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79-20-00-090
ENGINE OIL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
ENGINE OIL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 201-999 79-20-00
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79-20-00-090
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ENGINE OIL - DISTRIBUTION - FUNCTIONAL DESCRIPTION
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The engine oil indicating system supplies oil system data to the
display electronic units (DEUs). The primary and secondary
engine displays on the P2 center instrument panel show this
data:
* Oil quantity
* Oil pressure
* Oil temperature
* Oil scavenge filter condition.
These components monitor the oil system:
* Oil quantity transmitter
* Oil pressure transmitter
* Oil temperature sensor
* Scavenge oil filter clogging transmitter.
The oil quantity transmitter sends the oil quantity data directly to
the CDS/DEUs.
The three other components send data to the DEU through the
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