scope:

when an immediate need for a part has been shown and insufficient time exists for preparation of a complete specification, a "skeleton" document in the form of a DESC drawing is prepared. DESC drawing requirements may be developed during Parts Control Board (PCB) meetings with input form each of the members requiring the drawing for purchase of parts. Drawings may also be generated when multiple application of the part is observed and no other action is planned in the near future. Drawings covering the parts in question are then prepared by DESC and presented to the PCB for review and approval. Once approved, the DESC prepared drawings are to be used by the contractor to procure parts, in lieu of each contractor preparing his own.

DDL-103 provides a tabulation and cross reference of DESC drawings and vendor similar part numbers, and provides guidelines and procedures for the initiation and preparation of such drawings.