This standard covers those devices whose primary function is locking@ and excludes those devices which have integral locking features incorporated into the item being locked. The practices cover the types of locking devices described in the following sections: Section I Lock Wire (Safety wire used for locking purposes) Section II Key Washers Section III Cotter Pins Special applications involving conditions not covered by the basic principles described herein shall be shown on the drawing@ and where contradiction occurs between a drawing and this instruction@ the drawing shall prevail. PURPOSE: To establish the requirements of good practices for locking various fasteners and other parts which may require locking in critical applications such as aerospace propulsion systems.