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Purpose of This Notice. This notice advises Flight Standards Service (AFS) personnel of a change to guidance contained in Federal Aviation Administration (FAA) Order 8900.1, Flight Standards Information Management System (FSIMS), Volume 4, Chapter 4, Section 1, Minimum Equipment Lists and Configuration Deviation Lists for Part 91K Program Managers, and Part 121, 129, and 135 Certificate Holders. The purpose of the change is to correct guidance that conflicts with the intent of Title 14 of the Code of Federal Regulations (14 CFR) part 121, § 121.628. The intent of this regulation is made clear in a legal interpretation, which the Assistant Chief Counsel of the Regulations Division issued in 1997 (see Appendix B, Letter of Interpretation). This notice further advises principal operations inspectors (POI) to review a certificate holder's current minimum equipment list (MEL) processes and procedures to determine compliance with the new guidance and the CFRs.