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around the digital display are red. This is the out-of-limit range.
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ENGINE OIL - INDICATING - OIL TEMPERATURE INDICATING SYSTEM
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General
The oil filter bypass warning system shows the scavenge oil
filter condition data on a common display system display unit
(DU). The oil filter bypass indicating system uses a scavenge oil
filter clogging transmitter. The scavenge oil filter clogging
transmitter closes before the oil filter bypass valve opens. The
scavenge oil filter clogging transmitter sends the scavenge oil
filter bypass data to the display electronic units (DEUs) through
the EEC.
Physical Description
The scavenge oil filter clogging transmitter connects with the
EEC through a single connector. The scavenge oil filter has the
scavenge oil filter clogging transmitter.
Functional Description
The scavenge oil filter clogging transmitter monitors the oil
pressure difference between the inlet and the outlet of the
scavenge oil filter. When the scavenge oil filter clogging
transmitter closes, it 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 usually shows the oil filter bypass
message on the upper center display unit (DU).
Oil Filter Bypass Message
When the scavenge oil filter clogging transmitter closes, the
EEC sends a signal to the DEUs. The DEUS create a message to
show on the DU. The DUs shows the message OIL FILTER BYP.
The oil filter bypass message flashes for 10 seconds, and then
shows continuously.
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ENGINE OIL - INDICATING - OIL FILTER BYPASS WARNING SYSTEM
ENGINE OIL - INDICATING - OIL FILTER BYPASS WARNING SYSTEM
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