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TM 10-3930-659-34
2-22. LOCKWIRE (Cont).
c. Three screws or bolts are the maximum number that may be lockwired in a series when they
are spaced 4-6 in. (10.2-15.2 cm) apart. The maximum number of closely spaced multiple groups of
screws or bolts to be lockwired is limited to the number of units that can be lockwired with a 24 in.
(61 cm) length of wire.
d. Do not secure screws, bolts, or fittings which are spaced more than 6 in. (15.2 cm) apart.
Lockwire these fasteners to tie points 6 in. (15.2 cm) or less away.
e. Lockwire parts so that tension will be on lockwire when parts tend to loosen. Lockwire should
be installed and twisted tight so that loop around head stays down and does not come up over head
of screw or bolt. This does not apply to castellated nuts when slot is close to top of nuts; wire is more
secure when made to pass along the side of stud. Ensure that lockwire is tight but not overstressed.
f. Make pigtail of 4-2 in. (6.4-12.7 mm) at end of lockwire. Bend pigtail down so it will not
become a snag.
g. When lockwiring castellated nuts, tighten castellated nut to low side of torque range, then
continue tightening until slot lines up with hole.
h. In blind, tapped hole application of bolts, castellated nuts, or studs, lockwir e as illustrated.
SMALL SCREWS IN CLOSELY SPACED,
CLOSED GEOMETRICAL PATTERN:
SINGLE
FASTENER
APPLICATION:
EXTERNAL RETAINER RING:
SINGLE WIRE METHOD
DOUBLE TWIST METHOD
SINGLE WIRE METHOD
CASTELLATED NUTS ON UNDRILLED STUDS: MULTIPLE FASTENER APPLICATION:
DOUBLE TWIST METHOD
DOUBLE TWIST METHOD
2-23. FLUID DISPOSAL.
Dispose of contaminated drained fluids in accordance with the Standard Operating Procedures
(SOP) of your unit.
2-13
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