70-20-01
ALL ú ú C01 Page 208 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
G-M56-SP-0006(1)-00-B
Lockwire Procedure Figure 206
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70-20-01
ALL ú ú C01 Page 209 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
2) If you do this, the loop will stay down and will not move up and become a loose loop (refer to A and B, Fig. 206).
(c)
Twist the strands while they are tight until the twisted part is near a hole in the subsequent part. 1) The twisted wire must be in 0.125 inch (3.18 mm) or less of
the hole in the other part (refer to C and D, Fig. 206).
(d)
If you bend the free strand around the head of the second part, put the top strand through the hole in this part. 1) Put the lockwire through the first part, and bend the top
end of the wire along the head of the part or around it.
a) 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.
b) If you do this, the loop will stay down and will not move up and become a loose loop (refer to A and B, Fig. 206).
2) If you bend the free strand on the unit, the direction of the twist is not important. 3) If there are more than two units in the sequence, do these steps again (refer to E and F, Fig. 206).
(e) After you connect the last part, do this: 1) Continue to turn the wires to make a pigtail of 3 to 6
twists and is 0.250-0.50 inch (6.4-12.7 mm) in length. 2) Cut off the unwanted wire. 3) Bend the end of the lockwire into the part to prevent
damage (refer to G and H, Fig. 206).
NOTE: All the lockwires must agree usually with the
____ example, not all possible combinations of lockwire is given (Fig. 204).
(f) If the lockwire is not tight, after you install the lockwire with the instructions given before, do this: 1) Use the procedure that follows to make sure you install the
lockwire correctly.
2) Apply light, finger-pressure to the middle position of the lockwire span. a) Bend the lockwire in the two directions.
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70-20-01
ALL ú ú C01 Page 210 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
3) Measure the maximum flex you see at the midpoint and compare to these limits:
Length of the lockwire______________________ Maximum Flex
Between the Parts_________________ at the Center
0.5
inch (12.7 mm) 0.125 inch (3.2 mm)
1.0
inch (25.4 mm) 0.250 inch (6.4 mm)
2.0
inch (50.8 mm) 0.375 inch (9.5 mm)
3.0
inch (76.2 mm) 0.500 inch (12.7 mm)
4.0
inch (101.6 mm) 0.750 inch (19.1 mm)
5.0
inch (127.0 mm) 0.750 inch (19.1 mm)
6.0
inch (152.4 mm) 0.750 inch (19.1 mm)
4) If the lockwire does not agree with these limits, do these steps: a) Remove the lockwire. b) Install a new lockwire.
(g) Always cut, rather than break, the lockwire so the lockwire holes are not torn or damaged.
TASK 70-20-01-912-016-C00
6. Safety Cable Installation (Fig. 207)_________________________
A. Procedure
S 212-017-C00
CAUTION:_______DO NOT USE THE SAFETY CABLE AGAIN. ALWAYS USE NEW SAFETY CABLE. DAMAGE TO EQUIPMENT CAN OCCUR.
(1) Examine the safety-wire holes of the parts to be safetied for correct alignment.
(a) If the component is tightened to the correct torque and is not correctly aligned, replace the component.
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