PURPOSE. This NPG provides internal guidance in the following areas for Agencywide roles in procuring spare parts:

a. Program

b. Procurement

c. Logistics

d. Engineering

APPLICABILITY. This NPG is applicable to NASA Headquarters and Centers, including Component Facilities, the Jet Propulsion Laboratory, and contractors to the extent specified in their contract(s). The concept and policies contained herein shall be applied to nonexpendable major systems as defined in Office of Management and Budget Circular A-109, and may be used in other systems at the discretion of the program/project manager. OMB Circular A-109 defines a major system as that combination of elements that will function to produce the capabilities required to fulfill a mission need. The elements may include, for example, hardware, equipment, software, construction, or other improvements or real property. Major systems acquisition programs are those programs that (1) are directed at and are critical to fulfilling an Agency mission, (2) entail the allocation of relatively large resources, and (3) warrant special management attention. While a number of NASA major systems have passed significant program milestones, these guidelines shall be applied to all programs.