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The bypass valve is in the lubrication unit housing. The pop-out
indicator comes out before the bypass valve opens. You see a
red button in the sight glass dome when the pop-out indicator
comes out. This tells you there is a clogged condition and to
change the filter. This can prevent contamination of the
downstream oil circuit.
Training Information Point
Remove the drain plug, and drain the oil filter housing before
you remove the cover to remove the filter. Use the correct
container to hold the oil you drain from the housing.
ENGINE OIL - DISTRIBUTION - OIL SUPPLY FILTER
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The chip detectors collect and keep the unwanted materials
from the scavenge oil. This tells if there is mechanical failure of
an engine bearing or gear. The chip detectors keep all the
ferrous material or non-ferrous material pieces larger than 800
microns.
There are three chip detectors, one for each of these three
scavenge circuits:
* Forward sump
* Rear sump
* AGB and TGB.
Refer to the AMM for more information on the procedure if you
find material in a chip detector.
Location
The lubrication unit housing holds the chip detectors. They are
at the inlet of the scavenge pumps. The lubrication unit is on the
rear of the accessory gearbox at the 6:00 position. You open the
chip detectors/pressure relief door to get access to the chip
detectors.
See the engine cowling section for more information on the chip
detectors/pressure relief door. (SECTION 71-11)
Physical Description
A chip detector has a magnet and a metallic-mesh screen. Each
chip detector attaches to the lubrication unit housing through a
bayonet lock. A check-valve in the lubrication unit housing
prevents an oil leakage when you remove a chip detector.
Training Information Point
Read the name of the scavenge line on the lubrication unit body,
near each chip detector. This lets you find the area of the failure.
But you must inspect the chip detectors one at a time. The three
chip detectors are interchangeable. There is no mark to identify
a chip detector.
ENGINE OIL - DISTRIBUTION - CHIP DETECTOR
EFFECTIVITY
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79-20-00-050
Purpose
The debris monitoring system (DMS) detectors collect
unwanted materials from the scavenge oil. This tells if there
is a mechanical failure of an engine bearing or gear. The DMS
detector magnets collect ferrous material. When there is
sufficient ferrous material between the detector magnets, a
message will show on the control display units (CDUs). A
screen on each detector collects non-ferrous material larger
than 800 microns.
There are three DMS detectors, one for each of these scavenge
circuits:
* Forward sump
* Rear sump
* Accessory gearbox (AGB) and transfer gearbox (TGB).
　
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