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Purpose of this Notice. This notice amends and clarifies guidance for Federal Aviation Administration (FAA) inspectors to authorize and issue operations specification (OpSpec)/management specification (MSpec)/letter of authorization (LOA) B054, Class II Navigation Using Single Long-Range Navigation System (S-LRNS), to operators conducting airplane operations under Title 14 of the Code of Federal Regulations (14 CFR) parts 91, 91 subpart K (part 91K), 121, 121/135, 125 (including the Letter of Deviation Authority (LODA) part 125 subpart M (part 125M) operators), and 135. The sample templates contained in the notice appendices enable airplanes equipped with single long-range navigation systems (S-LRNS) to qualify for Required Navigation Performance 10 (RNP 10) authorization for operation in a limited number of designated areas of operation (e.g., the Gulf of Mexico). This notice amends all B054 templates (i.e., OpSpec/MSpec B054/MB054) and provides a new LOA B054.