Which figure shown in the illustration, is the nut lock improperly used? Illustration GS-0156
Official USCG Answer & Rule Citation
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.
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