NOTE: Make sure the lockwire does not hit the parts.
____ Refer to the instructions in this procedure (refer to F and G, Fig. 204).
(e) The maximum length of the lockwire between tension points is 6 inches (152 mm), unless specified differently. 1) When 3 or more fasteners make a group to lockwire together,
use the single-strand or the double-twist procedure.
2) A limit in the number of units you can connect with a
24 inch (610 mm) length of wire is the maximum number of
units in a sequence.
3) When you install a lockwire to all units that are far apart and in a group, use the double-twist procedure.
NOTE: Do not install the lockwire to more than three units
____ in a sequence (refer to H and I, Fig. 204).
CAUTION: DO NOT TURN THE LOCKWIRE MORE THAN 15 TIMES FOR EACH INCH
_______
(25.4 MM). IF YOU DO NOT OBEY, DAMAGE TO THE EQUIPMENT CAN OCCUR.
(f) Pull the lockwire tight while you twist it.
1) The lockwire must have a specific number of twists for the diameter of the wire: a) 9 to 12 twists for each inch (25.4 mm) for
0.020 inch (0.51 mm) diameter wire.
b) 7 to 10 twists for each inch (25.4 mm) for
0.032 inch (0.81 mm) diameter wire.
(g)
Lockwire the hose and the electrical coupling nuts the same as the tube coupling nuts (refer to F, G, J, K, L and M, Fig. 204).
(h)
Be careful when you twist the wire. 1) Keep the lockwire tight.
NOTE: Do not overstress the wire or permit it to have
____
nicks, kinks or damage.
(i)
Correct and incorrect procedures for lockwire practices (refer to Fig. 204, sheet 2).
(j)
Use the twist tools, that are recommended and locally available, to lockwire (Fig. 205).
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ALL ú ú C01 Page 206 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
OPEN END OF CLOSED END THE WIRE OF THE WIRE(CORRECT) (CORRECT)
THE LOCKWIRE TANGENTIAL APPROACH LINE
INCORRECT CORRECT
S-M56-MM-0314-(1)-00-B
Lockwire Practices
Figure 204 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 912-014-C00
(3) Procedures to Lockwire (Fig. 206).
CAUTION:_______DO NOT USE THE SAME LOCKWIRE AGAIN. USE A NEW LOCKWIRE FOR EACH ASSEMBLY OPERATION. DAMAGE TO THE EQUIPMENT CAN OCCUR.
(a) Examine the lockwire holes to the parts to make sure the holes are aligned correctly. 1) If a part is tightened to the correct torque value, but is
not correctly aligned, replace it with a different part.
NOTE: Lockwire holes that are correctly aligned with an
____ installed lockwire will not let the part become loose. Do not tighten more than the torque value limits of all the parts to make sure the holes are aligned.
(b) Put the lockwire through the first part, and bend the top end of the wire along the head of the part or around it. 1) If bent around it, the direction and twist of the strands
must come around the part and below the strands that point out of the hole.
G-M56-SP-0007(1)-00-C
Example of Lockwire Twist Tools Figure 205
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