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Purpose of This Notice. This notice provides revised guidance for Federal Aviation Administration (FAA) certificate-holding district offices (CHDO) and principal operations inspectors (POI) assigned to operators conducting airplane operations under Title 14 of the Code of Federal Regulations (14 CFR) parts 91 subpart K (part 91K), 121, 125 (including the Letter of Deviation Authority (LODA) 125M operators), 129, and 135. This notice amends and clarifies the authorization (C055) for alternate airport instrument flight rules (IFR) weather minimums. This notice amends all C055 templates (i.e., operations specification (OpSpec) C055, management specification (MSpec) C055, and letter of authorization (LOA) C055) for operators conducting airplane operations under parts 91K, 121, 125 (including LODA 125M operators), 129, and 135. This is a mandatory change to C055.