(3) When safetying a clevis pin, install the cotter pin with the axis of the eye parallel to the shank of the
clevis pin or rod end. Bend the prongs around the shank of the clevis pin or rod end, as shown in
Corrosion-resistant steel cotter pins shall be used only in areas required to be nonmagnetic, or where heat
resisting qualities are desired, such as forward of firewall.
(4) Install cotter pins in rotating parts such as propellers, rotor heads, and the like, with head in direction of
(5) Install cotter pins In stationary bolts with heads up or facing forward whenever possible. When
installing a cotter pin in a stationary bolt in a moving control such as elevator control push rod end to
elevator, carburetor mixture control rod end to carburetor mixture arm and the like, the head of the
cotter pin should be up or facing forward throughout the range of that control as much as possible.
Lockwire Installation. To prevent loosening during service, attaching parts, such a drilled-head bolts, fillster
head screws, turnbuckles, thumbscrews, plugs, and similar items, are secured by use of lockwire or cotter
pins. The following general rules shall apply to lockwire.
Eye protection is required when cutting lockwire. Injury to personnel may occur.
Figure 2-77. Cotter Pin Installation