C-6
IO-240 Series Engine Installation & Operation Manual
31 October 2011
Standard Practices
the loop and the loop is under the protruding strand that will wrap around the
opposing piece of hardware to ensure the loop is held in place on the first device. Pull
the protruding strand of safety wire with pliers until it is taut (but not overstressed).
4. While keeping the protruding strand of safety wire taut, twist the strands (based on
the wire gauge specified below) until the twisted part is just short of a hole in the
next unit. The twisted portion should be within one-eighth (1/8) inch from the hole in
either unit:
a. Twist 0.032” diameter safety wire at a rate of 7 to 10 twists per inch.
b. Twist smaller diameter safety wire at a rate of 9 to 12 twists per inch.
5. Pull the braided safety wire strand with pliers until it is taut (but not overstressed).
6. Insert the uppermost strand through the hole in the second piece of hardware.
7. Bend and wrap the twisted wire braid around the second piece of hardware, pulling
the wire taut as described in the previous steps, which will counter-lock the hardware
joined by the safety wire. Repeat the previous steps for any subsequent hardware to
be safety wired by this strand. Refer to Figure C-2 for various safety wire patterns.
All safety wire must fit snugly.
8. After safety wiring the last piece of hardware, continue twisting the safety wire to
form a pigtail, providing sufficient twists (four minimum) to ensure the pigtail will
not unravel.
CAUTION: Do not allow the safety wire pigtail to extend above the
bolt head.
9. Trim the excess safety wire and bend the pigtail toward the hardware, against the bolt
head flats.
Figure C-2. Safety wire Patterns for Right-Hand Threads
(Reverse the wire orientation for left-hand threads)
Summary of Contents for IO-240-A
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