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 | 7-127. Securing With Cotter Pins
AC 43.13-1B
7-127. SECURING
PINS.
WITH
COTTER
9/8/98
a. Cotter pins are used to secure such
items as bolts, screws, pins, and shafts. Their
use is favored because they can be removed
and installed quickly. The diameter of the
cotter pins selected for any application should
be the largest size that will fit consistent with
the diameter of the cotter pin hole and/or the
slots in the nut. Cotter pins should not be re-
used on aircraft.
b. To prevent injury during and after pin
installation, the end of the cotter pin can be
rolled and tucked.
FIGURE 7-6. Securing with cotter pins.
NOTE: In using the method of cotter
pin safetying, as shown in figures 7-6
and 7-7, ensure the prong, bent over
the bolt, is seated firmly against the
bolt shank, and does not exceed bolt
diameter. Also, when the prong is
bent over the nut, ensure the bent
prong is down and firmly flat against
the nut and does not contact the sur-
face of the washer.
FIGURE 7-7. Alternate method for securing with cotter
pins.
7-128.7-139. [RESERVED.]
Page 7-26
Par 7-127