Positive locking device explained

A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener. This means that the fastener cannot work loose from vibrations. The following is a list of positive locking devices:

• A split beam nut
• A castellated nut and a split pin
• A hex nut or cap screw and a tab washer
• A hex nut or cap screw and a lock plate
• Safety wiring with various types of fasteners

References

• Book: AC 43.13-1B - Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair. 7. Aircraft Hardware, Control Cables, and Turnbuckles. http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/list/AC%2043.13-1B/$FILE/Chapter%2007.pdf. 8 September 1998. 2012-12-11. .