FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 7. Aircraft Hardware, Control Cables, and Turnbuckles | 7. Safetying | 7-126. Securing Oil Caps, Drain Cocks, and Valves
9/8/98
AC 43.13-1B
Examples 1, 2, 3, and 4 apply to all types of bolts, fillister-head screws, square-head plugs, and other
similar parts which are wired so that the loosening tendency of either part is counteracted by tightening
of the other part. The direction of twist from the second to the third unit is counterclockwise in exam-
ples 1, 3, and 4 to keep the loop in position against the head of the bolt. The direction of twist from the
second to the third unit in example 2 is clockwise to keep the wire in position around the second unit.
The wire entering the hole in the third unit will be the lower wire, except example 2, and by making a
counterclockwise twist after it leaves the hole, the loop will be secured in place around the head of that
bolt.
Examples 5, 6, 7, & 8 show methods for wiring various standard items, NOTE: Wire may be wrapped
over the unit rather than around it when wiring castellated nuts or on other items when there is a clear-
ance problem.
Example 9 shows the
method for wiring bolts in
different planes. Note that
wire should always be ap-
plied so that tension is in
the tightening direction.
FIGURE 7-5. Safety-wiring procedures.
Hollow-head plugs shall
be wired as shown with
the tab bent inside the
hole to avoid snags and
possible injury to person-
nel working on the engine.
Correct application of single
wire to closely spaced multi-
ple group.
Par 7-126
Page 7-23