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EEC.
The temperature/pressure (T/P) sensor assembly contains the
oil pressure transmitter and the oil temperature sensor.
ENGINE OIL - INDICATING - GENERAL DESCRIPTION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ENGINE OIL - INDICATING - GENERAL DESCRIPTION
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Component Locations
These components of the engine oil indicating system are on
the left side of the fan case:
* Oil pressure transmitter, on the T/P sensor assembly (10:00
position)
* Oil temperature sensor, on the T/P sensor assembly (10:00
position)
* Scavenge oil filter clogging transmitter, on the oil scavenge
filter assembly (8:00 position)
The oil quantity transmitter is on the oil tank (2:00 position), on
the right side of the fan case.
Open the fan cowls to get access to these components.
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General
The oil quantity indicating system shows the engine oil quantity
data on the secondary engine display. The oil quantity
indicating system uses an oil quantity transmitter to measure
the oil quantity in the oil tank. The oil quantity transmitter sends
the oil quantity data directly to the display electronic units
(DEUs).
Physical Description
The oil quantity transmitter is an electrical resistance sensor. It
uses a floating magnet and reed switches to give the oil level
information. The oil quantity transmitter has one connector to
transmit data to the DEUs.
Functional Description
The DEUs supply an excitation signal to the sensing circuit of
the oil quantity transmitter. As the floating magnet moves up or
down with the oil level, the reed switches open or close different
resistor circuits. A sensor output signal in proportion to the oil
level goes to the DEUs. The DEUs show the oil quantity on the
secondary engine display.
Indication
The secondary engine display shows usable oil quantities in
quarts or liters. The display range is 0 to approximately 19
quarts. A quantity more than 19 quarts shows as 19 quarts. The
wing dihedral causes the oil tank for engine 2 to hold more oil
than engine 1.
A LO message shows when the oil quantity is less than 4 quarts
for 35 seconds. The oil quantity shows in reverse video when
the low quantity exceedance is active.
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General
The oil pressure indicating system shows the engine oil
pressure data on a display unit (DU). An oil pressure
transmitter measures the oil pressure at the outlet of the
lubrication unit. The oil pressure transmitter sends the oil
pressure data to the display electronic units (DEUs) through the
　
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