70-20-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
S 912-006-C00
 CAUTION:_______DO NOT USE THE SAME COTTER PINS AGAIN. USE NEW COTTER PINS FOR EACH ASSEMBLY OPERATION. WHEN YOU TIGHTEN THE FASTENERS, DO NOT USE MORE THAN THE MAXIMUM TORQUE VALUE. DAMAGE TO THE EQUIPMENT CAN OCCUR.
 (1)  After you apply the minimum torque to a castellated nut, do these steps:
 (a)  
Tighten the castellated nut until the one slot on the nut is straight with the hole for the cotter pin.

 (b)  
If you cannot align the nut and the hole, then loosen the nut by one-half turn. 1) Tighten the castellated nut again.

 (c)  
If you cannot correctly align the castellated nut again, then replace the nut.

 S 912-007-C00
 (2)  Install the cotter pin with the head engaged tightly in the slot of the nut.
 (a)  Bend the points of the cotter pin until the head and the top point are tightly engaged against the bolt.
 TASK 70-20-01-912-008-C00
 4.  Install the Tab Washer______________________
 A. Procedure (Fig. 203)
 S 912-009-C00
 CAUTION:_______DO NOT USE THE TAB WASHERS AGAIN. USE NEW TAB WASHERS FOR EACH ASSEMBLY OPERATION. DAMAGE TO THE EQUIPMENT CAN OCCUR.
 (1)  Install the tab washer in the correct position.
 (a)  Install the lock tab so it cannot get loose.
 S 912-010-C00
 (2) Bend the lock tab tightly against the flat side of the nut.
 (a)  Refer to Fig. 203 for the correct procedure to bend the tab.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
TASK 70-20-01-912-011-C00
 5. Install the Lockwire
____________________
 A. Procedure
 S 912-012-C00
 (1)  The lockwire is a safety device to make sure two or more parts stay together.
 (a)  
If the part starts to become loose, then the lockwire would tighten more to oppose the part in the opposite direction.

 (b)  
When you install a lockwire, use the general instructions and the specified procedures that follow.

 S 912-013-C00
 (2)  General Instructions to Lockwire.
 (a)  
Unless specified differently, the lockwire must be a NC15Fe wire with a 0.032 inch (0.81 mm) diameter.

 (b)  
Twist together the two strands with the double-twist procedure to install the lockwire. 1) You get one twist when you turn the wires through an arc of

 180 degrees and is equal to one-half a full turn. 2) You can use the single-strand procedure (see C, Fig. 204) only when it is specified.

LOCK TAB
G-M56-SP-0004(1)-01-C
Tab Washer Installation Figure 203
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
B
C
A
D
H
RIGHT HAND TWIST
LEFT HAND TWIST
PIG TAIL
E
F
G
I
J
K
L M
G-M56-SP-0008(1)-00-B
Lockwire Practices
Figure 204 (Sheet 1)

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 70-20-01
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CFM56 ENGINES
　
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