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Purpose of This Notice. This notice announces a revision to operations specification (OpSpec) and management specification (MSpec) A010, Aviation Weather Information, and provides guidance for Federal Aviation Administration (FAA) certificate-holding district offices (CHDO), including Fight Standards District Offices (FSDO) and certificate management offices (CMO), and principal operations inspectors (POI) assigned to certificate holders conducting airplane operations under Title 14 of the Code of Federal Regulations (14 CFR) parts 91 subpart K (part 91K), 121, 125, and 135. This notice also announces significant changes to guidance contained in FAA Order 8900.1, Flight Standards Information Management System (FSIMS), Volume 3, Chapter 25, Section 1, and Volume 3, Chapter 26, Sections 1 through 4.