EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 71-00-58
 ALL  ú ú C01 Page 101 ú Nov 15/96 
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL //////////////////////// 
FUEL NOZZLE
FWD 
SEE A  (20 PLACES) 
SEE B FUEL SUPPLY AND MANIFOLD SHROUD DRAIN 
LEFT VSV 
ACTUATOR 
SEAL AND 
SHROUD DRAIN
VBV FUEL GEAR MOTOR SEAL DRAIN 
FWD 
CHECK ENGINE FUEL SYSTEM FOR LEAKS FUEL SUPPLY SHROUD DRAIN MANIFOLD 
FUEL MANIFOLD 
NOTE:  ENGINE BUILDUP EQUIPMENT NOT SHOWN FOR CLARITY. 
A 
HPT CLEARANCE CONTROL VALVE DRAIN AND RIGHT VSV ACTUATOR SEAL AND SHROUD DRAIN 
CIT SENSOR SHROUD DRAIN 
FUEL PUMP PAD DRAIN 
MEC SHAFT DRAIN 
MAIN OIL/FUEL  
MEC CASING  HEAT EXCHANGER  
DRAIN  DRAIN 
Fuel Drain Lines 
B
1.  
OPEN FAN DUCT COWL AND THRUST REVERSER HALVES (78-31-00 MP).
2.  
CHECK FOR EVIDENCE OF FUEL LEAKAGE FROM FUEL MANIFOLD AND FUEL DRAIN MANIFOLD ON ENGINE CORE.
3.  
CHECK FOR EVIDENCE OF INTERNAL FUEL LEAKS, INDICATED AS FUEL DRIPPING FROM FUEL DRAIN LINES (REFER TO 71-71-00 I/C FOR ALLOWABLE LEAKAGE AND CORRECTIVE ACTION).
4.  
CLOSE FAN DUCT COWL AND THRUST REVERSER HALVES (78-31-00 MP).
Engine Fuel System Leak Check 
Figure 101
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 71-00-58
 ALL  ú ú C01 Page 102 ú Feb 25/85 
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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL //////////////////////// 
2 
1 
A 
ENGINE OIL SYSTEM PLUMBING AND LEAK CHECK
SEE A 
3 
SEE B 
SEE C 
4 
1. 
OPEN FAN DUCT COWL AND THRUST REVERSER HALVES (78-31-00 MP).
2. 
EXAMINE THE FOLLOWING FOR DAMAGE AND/OR LEAKS:
A. MAIN OIL/FUEL HEAT EXCHANGER (1) 
B. SERVO FUEL HEATER (2) 
C. "OIL IN" TUBE (3) FROM SCAVENGE OIL FILTER (13) TO SERVO FUEL HEATER (2) 
D. "OIL OUT" TUBE (4) FROM SERVO FUEL HEATER (2) TO OIL TANK (14) 
E. SCAVENGE OIL FILTER (13) 
F. OIL SUPPLY FILTER (9) 
G. MAGNETIC CHIP DETECTORS (8) 
H. LUBRICATION UNIT (7) 
I. FORWARD SUMP OIL SUPPLY TUBE (5) FROM LUBRICATION UNIT (7) TO FORWARD SUMP AND TGB 
J. AFT SUMP OIL SUPPLY TUBE (6) FROM LUBRICATION UNIT (7) TO AFT SUMP VIA 6 O'CLOCK STRUT 
K. AGB OIL SUPPLY TUBE (11) FROM LUBRICATION UNIT (7) TO AGB 
L. SCAVENGE OIL FILTER INLET TUBE (10) FROM LUBRICATION UNIT (7) TO SCAVENGE OIL FILTER (13) 
M. TGB SCAVENGE TUBE (12) FROM TGB TO AGB 
 
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