71-00-58
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CHECK OIL SYSTEM DRAINS
1.WITH ENGINE SHUT DOWN, CHECK UNDERSIDE OF FAN COWL PANEL FOR EVIDENCE OF OIL LEAKAGE FROM STARTER AIR DISCHARGE DUCT FITTING AND FORWARD DRAIN HOLE.
2. CHECK FOR OIL LEAKING FROM AFT SUMP DRAIN HOLE [(LIMIT IS 60 CC/HR (20 DROPS/MIN)].

Engine Oil System Drain Check
Figure 113 (Sheet 1)

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CHECK OIL SYSTEM DRAINS (CONT)
3.  IF OIL LEAKAGE IS EVIDENT FROM STARTER AIR DISCHARGE DUCT FITTING OR FORWARD DRAIN HOLE, OPEN RIGHT FAN COWL PANEL (71-11-02 MP) AND CHECK FOR OIL DROPLETS FROM DRAIN TUBES.
A.  IF OIL LEAKAGE FROM ACCESSORY PAD DRAINS EXCEEDS LIMITS, PERFORM APPROPRIATE CORRECTIVE ACTION (71-71-00 I/C).
B.  IF OIL IS LEAKING FROM OIL TANK SCUPPER DRAIN, CHECK OIL TANK FILLER CAP FOR PROPER FIT.
C.  IF OIL LEAKAGE FROM FORWARD SUMP DRAIN EXCEEDS LIMITS (71-71-00 I/C), REPLACE ENGINE
(71-00-02).

4.  CLOSE RIGHT FAN COWL PANEL (71-11-02 MP).
SEE  B
SEE  C
FORWARD SUMP DRAIN STARTERGENERATOR FWD
PAD DRAIN FUEL PUMP AFT DRAINS PAD DRAIN
PAD DRAIN
B
HYDRAULIC PUMP PAD DRAIN
CSD
PAD DRAIN

OIL TANK SCUPPER DRAIN
FWD
FORWARD DRAINS
C
Engine Oil System Drain Check
Figure 113 (Sheet 2)

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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
EXAMINE OIL INDICATING SYSTEM PLUMBING
1.  
OPEN LEFT FAN COWL PANEL (71-11-02 MP).

2.  
EXAMINE VENT PRESSURE TUBES AND OIL SUPPLY PRESSURE TUBES TO LOW OIL PRESSURE SWITCH AND OIL
PRESSURE TRANSMITTER FOR LEAKS OR COLLAPSED AREAS.

3.  
EXAMINE INLET AND OUTLET PRESSURE TUBES TO OIL FILTER BYPASS PRESSURE SWITCH FOR LEAKS OR
COLLAPSED AREAS.

4.  
CLOSE LEFT FAN COWL PANEL (71-11-02 MP).

LOW OIL PRESSURE SWITCH
OIL SUPPLY PRESSURE TUBES
SEE  B
SEE  A
OIL PRESSURE TRANSMITTER
BYPASS SWITCH OUTLET PRESSURE VENT
TUBE PRESSURE BYPASS SWITCH TUBES INLET PRESSURE TUBE
BYPASS SWITCH FORWARD SUMP INLET PRESSURE OIL SUPPLY TUBE
TUBE TRANSFER GEARBOX HOUSING
FWD
FWD
OIL PRESSURE INDICATING AND LOW OIL PRESSURE WARNING SYSTEM PLUMBING
BYPASS SWITCH OUTLET PRESSURE
A
TUBE
OIL FILTER BYPASS
PRESSURE SWITCH

OIL FILTER BYPASS WARNING SYSTEM PLUMBING
B
Oil Indicating System Plumbing CheckFigure 114
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////

A

FLAME ARRESTOR CHECK
_______EXHAUST AREA MAY BE EXTREMELY HOT AND MAY CAUSE INJURY TO PERSONNEL IF CONTACTED.

WARNING:
1.
USING FLASHLIGHT, VIEW FLAME ARRESTOR THROUGH OPENING IN END OF TURBINE EXHAUST PLUG AND CHECK SCREEN FOR CLOGGING.

2.
IF SIGNIFICANT CLOGGING IS FOUND, REPLACE FLAME ARRESTOR (72-56-01).

Flame Arrestor Check
Figure 115

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