How many twists should be left from the last fastener after trimming the lockwire?

When locking fasteners with lockwire, it is essential to leave the correct number of twists after trimming to ensure adequate security and adhere to proper safety standards. Leaving three to five twists provides enough friction and tension to maintain the locking mechanism, preventing the fastener from loosening due to vibration or movement in service. This range strikes a balance between ensuring that the lockwire is secured properly while allowing for some flexibility in its application.

Moreover, having this specific number of twists minimizes the risk of wire fatigue while also ensuring that the wire can effectively resist forces that may act against the fastener. Proper lockwire installation is a critical part of assembly mechanics in aerospace applications, ensuring both safety and reliability in aircraft operations.