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supply line) and the TGB cavity. The oil pressure transmitter
sends an electric signal to the EEC. The EEC changes this
signal into an ARINC 429 signal and sends it to the DEUs. The
DEUs show the oil pressure on the secondary engine display.
Indication
Oil pressure shows on two vertical indicators and two digital
displays. A pointer shows the oil pressure in psi differential
(psid) on each vertical indicator. The indicator has two index
markers. The amber index marker shows the oil pressure
amber limit. The red index marker shows the oil pressure
redline limit. If the oil pressure shows between the amber limit
and the redline limit, the digital display and the box around the
digital display are amber. This is the caution range. If the oil
pressure shows under the redline limit, the digital display and
box around the digital display are red. This is the out-of-limit
range.
The low oil pressure amber limit set pressure increases based
with an increase in engine speed.
Refer to the AMM for more information on the procedure when
the oil pressure is in the caution range or in the out-of-limit
range.
LOW OIL PRESSURE Message
When the oil pressure is less than the red line limit, the EEC
sends a signal to the DEUs. This causes the DU to show the
amber LOW OIL PRESSURE message. There is one LOW OIL
PRESSURE message for each engine. The LOW OIL
PRESSURE message shows on the primary engine display.
ENGINE OIL - INDICATING - OIL PRESSURE INDICATING SYSTEM
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
79-30-00-040
The amber LOW OIL PRESSURE message flashes for 10
seconds then shows continuously when the oil pressure is less
than the red line limit. The DEUs inhibit the flash mode for
takeoff and landings.
During start, the EEC prevents the indicator and pointer from a
change to amber or red.
ENGINE OIL - INDICATING - OIL PRESSURE INDICATING SYSTEM
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
79-30-00-040
ENGINE OIL - INDICATING - OIL PRESSURE INDICATING SYSTEM
ENGINE OIL - INDICATING - OIL PRESSURE INDICATING SYSTEM
EFFECTIVITY
GUN ALL 79-30-00
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
79-30-00-040
General
The oil temperature indicating system shows the engine oil
temperature data on a CDS display unit (DU). The oil
temperature indicating system uses an oil temperature
sensor to measure the oil temperature at the outlet of the
lubrication unit. The oil temperature sensor transmits the oil
temperature data to the display electronic units (DEUs) through
the EEC.
Physical Description
The oil temperature sensor has two sense elements. Each
element connects with one channel of the EEC. There is only
one connector for the two channels. The T/P sensor contains
the oil temperature sensor.
Functional Description
The oil temperature sensor gets the oil temperature data on the
forward sump and TGB oil supply line. The oil temperature
sensor sends an electric signal to the EEC. The EEC changes
this signal to an ARINC 429 signal and sends it to the DEUs. The
DEUs show the oil temperature on the secondary engine
display.
Indication
The oil temperature shows on two vertical indicators and two
digital displays. A pointer shows the oil temperature in degrees
celsius on each indicator. The vertical indicator has two index
markers. The amber index marker shows the oil temperature
amber limit. The red index marker shows the oil temperature
redline limit.
If the oil temperature is between the amber limit and the redline
limit, the digital display and the box around the digital display
are amber. This is the caution range. If the oil temperature is
more than the redline limit, the digital display and the box
around the digital display are red. This is the out-of-limit range.
ENGINE OIL - INDICATING - OIL TEMPERATURE INDICATING SYSTEM
EFFECTIVITY
GUN ALL 79-30-00
Page 12
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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