The FAA's proposed Advisory Circular 91-85A describes various acceptable means for operators to obtain initial operational authorization or amend an existing operational authorization to conduct flight in airspace or on routes where reduced vertical separation minimums (RVSM) are applied. RVSM airspace includes any airspace or route between FL290 and FL410, inclusive, where aircraft are separated vertically by 1,000 feet.
This proposed circular also provides information on RVSM performance specifications, obtaining and maintaining RVSM airworthiness certification for aircraft, specific elements of an RVSM authorization, policy and procedures for RVSM operations and the methods for an airman to demonstrate his or her qualification as an “RVSM Knowledgeable Pilot.” The FAA said the advisory material contained in this AC has been “substantially modified” since the circular was issued in its original form in 2009 as AC- 91-85. The 71-page document applies to all operational segments seeking RVSM initial and continued approvals for Part 91, 121, 125, 135 and 121 operators. Comments on draft AC 91-85A are due by November 12.