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A
737-300/400/500MAINTENANCE MANUAL
 LOCKWIRE - REMOVAL/INSTALLATION
_______________________________
 1.  General_______
 A.  This procedure contains one task. The task is the replacement of lockwires.
 B.  If this procedure does not agree with specified maintenance procedures, use the specified maintenance procedure.
 C.  Do not use the lockwire more than once.
 D.  Install the lockwire to put it in tension when the parts become loose.
 E.  Make three to six twists at the end of the wire. Bend the twists back or under the wire, or things can get caught on the end.
 F.  Use the double-twist procedure for all lockwire unless a single wire procedure is specified.
 G.  Install and twist the safety wire so the loop around the head stays down. (If the loop tended to come up over the bolt head there would be a slack loop.)
 H.  For multiple fasteners spaced less than four inches apart, the maximum number which can be safety wired together shall be the number than can be wired with a 24-inch length of wire.
 I.  For fasteners four to six inches apart, wire together in series no more than three fasteners.
 J.  Where fasteners are more than six inches apart, do not tie them in series unless tie points are provided on adjacent parts to shorten the wire span to less than six inches.
 K.  Use a right-handed twist for all double twist installations.
 L.  Safety-wire diameter shall be between 1/3 and 3/4 of the hole diameter, 0.032-inch diameter minimum.
 M.  Safety-wire 0.020 inch in diameter may be used if:
 (1)
The safety-wire hole is 0.045 inch diameter or smaller, or

 (2)
The spacing between parts is less than two inches and the safety

 wire hole diameter is between 0.045 and 0.062 inch diameter. ~.............................................................................. | TWIST PER INCH | ................................................................................ | | | 0.019 | 0.023 | 0.043 | | |Safety Wire| Less Than | to | to | to | More Than | | Dia. Inch | 0.019 | 0.026 | 0.042 | 0.065 | 0.065 | ................................................................................ |Twists/Inch| 11 to 14 | 9 to 12 | 7 to 10 | 5 to 8 | 4 to 7 | 2...........…...........…............….............….............….............1
 TASK 20-10-44-964-009
 2.  Lockwire - Replacement (Fig. 401)
______________________
 A.  Procedure - Remove the Lockwire
 S 024-002
 (1) Cut and remove the lockwire or remove the pin.
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 20-10-44
 ALL  ú ú 02 Page 401 ú Nov 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

DOUBLE TWIST PROCEDURE

DOUBLE TWIST PROCEDURE

SINGLE-WIRE PROCEDURE (CLOSELY SPACED)
Bacic Lockwire Procedure Figure 401
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 20-10-44
 ALL  ú ú 01 Page 402 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B. Procedure - Install the Lockwire
 S 804-007
 (1)  Use these types of wires for lockwire:
 (a)  
Use monel, inconel, or corrosion-resistant lockwire in high temperature areas.

 (b)  
Use copper wire, 0.020-inch diameter, on emergency equipment only. Use it where a seal is necessary on emergency equipment to show no person has used the equipment. Emergency equipment includes portable fire extinguishers, first aid kits, emergency valve, and oxygen regulators.

 (c)  
Use Clad 5056 aluminum alloy wire for lockwire that touches magnesium to prevent galvanic corrosion.

 (d) This table shows BAC standard wire sizes. ~............................................................................. | MATERIAL | SIZE (INCH) | ...............................................................................
 | Monel or Inconel  |  .020  .032  .040  .051  .091  |
　
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