RVSM Operations have changed with the advent of ADS-B per Part 91 Appendix G as detailed in FAA guidance AC 91-85B. For domestic operations there is no need for issuance of a LOA or OpSpecs, however for operators application for authorization of RVSM is still required when:
a) The aircraft is operated in RVSM airspace where the FAA can not successfully monitor the aircraft’s height-keeping performance; or
b) The operator intends to conduct RVSM operations in foreign airspace where the State authority requires a specific RVSM operational authorization.
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Note: Reference AC 91-85B. RVSM approval B046 is still required for international operations.