scope:

Practice:

The source for selection of acceptable flight quality EEE parts for use on Goddard projects is the GSFC Preferred Parts List (PPL-20) (Reference 2). PPL-20 complements NASA Standard Electrical, Electronic, and Electromechanical (EEE) Parts List (NSPL) (MIL-STD-975) (Reference 1) by listing additional part types and part categories not included in MIL-STD-975. Recognizing that it is neither possible nor desirable to include all parts in the GSFC PPL and in the NSPL, the GSFC parts requirements make provision that limited numbers of parts not included in the PPL or the NSPL may be used if it is demonstrated that the parts are acceptable (Reference 5, section 5). The acceptability of nonstandard parts is enhanced by use of the part procurement specifications provided in Appendix E of PPL-20. The acceptability of these nonstandard parts must be demonstrated prior to commitment to design or use. Requests for approval to use nonstandard parts with supporting documentation are forwarded to the appropriate GSFC Project Office for review and approval. The practice described herein is used for demonstrating and documenting the acceptability of nonstandard parts for space flight use.