Which figure shown in the illustration, is the nut lock improperly used? Illustration GS-0156

Correct Answer: Option D — "C" and "E"

Figures C and E demonstrate improper installation of nut locks. Proper locking requires the tab or washer to be securely seated against a flat surface to prevent rotation. Improper orientation or failure to engage the locking feature compromises the integrity of the bolted connection under operational vibration.