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02-40
SAFETYING – MAINTENANCE PRACTICES
20-40 SAFETYING – MAINTENANCE PRACTICES
General
Safety locking allows for securing by various means any nut, bolt, turnbuckle etc. on the
aircraft so that vibration will not cause it to loosen during operation.
When applied, it prevents the disengagement of screws, nuts, bolts, snap rings, oil caps, drain
cocks, valves, and parts.
Specific data for other types of safety locking are described in the individual maintenance
practices.
Three basic methods are used in safetying; safety-wire, cotter pins, and self-locking nuts.
Wire, either soft brass or steel is often used on control cable turnbuckles and engine
accessory attaching bolts.
Cotter pins are used on any point where a turning or actuating movement takes place.
Self-locking nuts are used in applications where they will not be removed often. Repeated
removal and installation will cause the self-locking nut to lose its locking feature.
They should be replaced when removed.
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