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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
3. AIRPLANES WITH SEC. ENG. & HYD. DISPLAY; Trouble Symptoms Listing
________________________ Trouble Symptom_______________ Begin Trouble Shooting
Oil Quantity Display Inoperative Fig. 102 Block 1 Reading Does Not Change Fig. 102 Block 1 Oil Quantity Display Reads Improperly Fig. 102 Block 3 Fluctuates Fig. 102 Block 3 High or Low Fig. 102 Block 3
NOTE: Engine oil level fluctuations of less than +/- 1 quart
____ (1 liter) are in the permitted limits for normal engine operation.
Oil Pressure Display Inoperative Fig. 103 Block 1 Oil Pressure Display Reads Improperly Fig. 103 Block 1 Fluctuates Fig. 103 Block 3 Low or High Fig. 103 Block 1 Oil Temperature Display Inoperative Fig. 104 Block 1 Oil Temperature Display Reads Improperly Fig. 104 Block 3 Fluctuates Fig. 104 Block 3 High or Low Fig. 104 Block 3 Low Oil Pressure Warning Light Problems Fig. 105 Block 1 Illuminated, Oil Pressure Normal Fig. 105 Block 3 Always Illuminated Fig. 105 Block 5 Extinuished After Engine Shutdown Fig. 105 Block 10 Oil Filter Bypass Warning Light Problems Fig. 106 Block 1 Illuminated During Engine Operation Fig. 106 Block 3 Always Illuminated Fig. 106 Block 10
4. Trouble Shooting Tips
_____________________
A. The low oil pressure warning switch and oil filter differential switch are grounded to their respective mounting brackets through the switch case. When replacing the switch make sure contact surfaces between switch and mounting bracket are clean.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE B
SEE C
SEE A
SEE D
ANTI-SIPHON
VENT TUBE TUBE
LUBE
SCAVENGE
TUBE
LUBE
SUPPLY
TUBE
OIL QUANTITY TRANSMITTER
FILLER
CAP
SCUPPER
SIGHT GLASS
OIL TANK
SCUPPER DRAIN TUBE FWD
OIL TANK
A
Oil Indicating System - Component Location Figure 101 (Sheet 1)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ELECTRICAL CONNECTOR
LOW OIL PRESSURE WARNING SWITCH
OIL PRESSURE
TRANSMITTER
PRESSURE OIL SUPPLY ELECTRICAL CONNECTOR VENT PRESSURE FROM TGB
LOW OIL PRESSURE WARNING SWITCH
AND OIL PRESSURE TRANSMITTER
B
Oil Indicating System - Component Location
Figure 101 (Sheet 2)
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C36793
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
OIL OUTLET 1 OIL BULB TEMPERATURE 2
OIL TEMPERATURE BULB
BOWL OIL INLET
FWD C OIL TEMPERATURE BULB
TUBE INLET PRESSURE LUBRICATION UNIT
ELECTRICAL CONNECTOR
1 2 Figure 101 (Sheet 3) Oil Indicating System - Component Location D OIL FILTER DIFFERENTIAL WARNING SWITCH BRACKET TUBE OUTLET PRESSURE PRESSURE SWITCH OIL FILTER DIFFERENTIAL ENGINES WITHOUT CFMI SB 79-063 ENGINES WITH CFMI SB 79-063
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