Lockwire

a. LOCKWIRE TECHNIQUE.

(1) Lockwire must be tight after installation to prevent failure due to rubbing or vibration.

SAFETY WIRING ACROSS THE HEAD

SAFETY WIRING ANGULAR DRILLED BOLT HEAD

COUNTERCLOCKWISE,

CLOCKWISE /COUNTERCLOCKWISE

CLOCKWISE-—__ >

L __-CLOCKWISE

MULTIPLE DOUBLE TWIST METHOD

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(2) Lockwire must always be installed so that it tends to tighten the part, thereby counteracting the natural tendency of the part to loosen. Determine whether the part tightens when turned to the right or to the left, as this governs the direction in which the lockwire is to be threaded through the safety hole. The illustrations above show typical methods for lockwiring right-hand threaded parts.

(3) Lockwire must never be overstressed. When tightening the lockwire, twist it enough to ensure the securing of the part, but not so much that the wire becomes stressed to the point where it will break under a slight load.

(4) Handle lockwire during installation so that the strands do not become kinked, nicked, or flattened. Avoid pulling the wire around square corners or gripping it too tightly with tools.

(5) Make certain safety holes are exposed as much as possible and that parts are properly tightened before installing lockwire. However, parts should not be loosened or torqued beyond the specified values in order to improve the location of the safety holes. Do not drill or use unspecified safety holes.

(6) Never twist off the wire ends with pliers. Cut the ends square to eliminate sharp points, leaving from three to six turns after the loop. Do not allow cut ends to fall into the parts being lockwired.

(7) Lockwire ends must be bent in toward the item being lockwired to prevent possible injury to the operator's hands.

(8) Lockwire must never be reused.

(9) Use double lockwire in all cases.

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