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N. OIL TANK (14)
O. OIL TANK MAGNETIC DRAIN PLUG (15)
P. AFT SUMP SCAVENGE TUBE (19) FROM AFT SUMP TO LUBRICATION UNIT (7) VIA 6 O'CLOCK STRUT
Q. FORWARD SUMP SCAVENGE TUBE (18) FROM FORWARD SUMP TO LUBRICATION UNIT (7)
R. AGB SCAVENGE TUBE (17) FROM AGB TO LUBRICATION UNIT (7)
S. LUBE SUPPLY TUBE (16) FROM OIL TANK (14) TO LUBRICATION UNIT (7)
3. CLOSE FAN DUCT COWL AND THRUST REVERSER HALVES (78-31-00 MP).
Engine Oil System Plumbing and Leak Check Figure 102 (Sheet 1)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
4 
3 
5 
6 
13 
12 
11 
10 
9 
8 
7 
B 

4
15
19
18
8 17 C
Engine Oil System Plumbing and Leak Check Figure 102 (Sheet 2)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
MEC FUEL CONTROL SEE A BOX
MEC SPECIFIC GRAVITY SETTING CHECK
1.  OPEN THE LEFT FAN COWL PANEL SPECIFIC
(AMM 71-11-02/201).
GRAVITY
2.  LOOK AT THE BOTTOM OF MEC, EXAMINE ADJUSTER
SETTING OF SPECIFIC GRAVITY ADJUSTER,
AND COMPARE TO SPECIFICATION FOR FUEL MAIN ENGINE CONTROL (MEC) - BOTTOM VIEW

TYPE IN TABLE BELOW. IF THE NOMINAL
SPECIFIC GRAVITY OF THE FUEL IS KNOWN  A
TO BE SLIGHTLY DIFFERENT THAN THE STANDARD,
THAT VALUE SHOULD BE USED AS THE NORMAL
VALUE AND THE ENRICHMENT ADJUSTMENT FROM
THAT VALUE MAY BE UP TO 0.04 UNITS.

SPECIFIC GRAVITY SETTINGS
*MAXIMUM ADJUSTMENTFUEL
JET A, JET A1, JP-1, JP-5, JP-8
0.82
0.78
JET B, JP-4

0.77
0.73
*THE FUEL ENRICHMENT IS ONLY ALLOWABLE ON ENGINES THAT
HAVE A 5TH-STAGE START BLEED VALVE (CFMI SB 72-298).

3.  IF IT IS NECESSARY, ADJUST SPECIFIC GRAVITY SETTING AS FOLLOWS:
A.  USE A 5/32-INCH HEXAGONAL WRENCH, TURN SCREW IN CENTER OF SPECIFIC GRAVITY PLATE TO ALIGN SCRIBE MARK ON SCREW WITH APPLICABLE INDEX MARK ON PLATE.
4.  CLOSE THE LEFT FAN COWL PANEL (AMM 71-11-02/201).
MEC Specific Gravity Setting Check Figure 103
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE B
SEE A
CIT SENSOR SHROUD DRAIN
FWD
A
CHECK CIT SENSOR TUBING
1.OPEN LEFT FAN DUCT COWL AND THRUST REVERSER HALF (78-31-00 MP). 2.CHECK CIT SENSOR SHROUD DRAIN TUBE FOR EVIDENCE OF FUEL LEAKAGE. IF FOUND, REPLACE CIT SENSOR (73-21-02). 3.VISUALLY EXAMINE ACCESSIBLE TUBING ON FAN CASE AND ENGINE CORE FOR THE FOLLOWING (SHEET 2):
A. EVIDENCE OF FUEL LEAKS
B. CRACKS
C. DENTS
D. COLLAPSED SECTIONS
E. WEAR THROUGH
F. KINKS
G. LOOSE FITTINGS
4. CLOSE FAN DUCT COWL AND THRUST REVERSER HALF (78-31-00 MP).
CIT Sensor Tubing Check Figure 104 (Sheet 1)
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