MWA encounters do not necessarily result in altitude deviations on the order of 200 feet. The guidance below is intended to address less significant MWA encounters. Mountain Wave Activity (MWA) Encounters  −  General Pilot actions: Controller actions: GLYPH<C0083> Contact ATC and report experiencing MWA GLYPH<C0083> If so desired, pilot may request a FL change or re − route  GLYPH<C0083> Report location and magnitude of MWA to ATC GLYPH<C0083> Advise pilot of conflicting traffic at adjacent FL GLYPH<C0083> If pilot requests, vector aircraft to avoid merging target with traffic at adjacent RVSM flight levels, traffic permitting GLYPH<C0083> Issue FL change or re − route, traffic permitting GLYPH<C0083> Issue PIREP to other aircraft See paragraph 4 − 6 − 6 for guidance on MWA. Paragraph 4 − 6 − 6 explains “traffic permitting.” NOTE − Wake Turbulence Encounters “Unable RVSM Due Equipment” Failure of Automatic Altitude Control System, Altitude Alerter or All Primary Altimeters One Primary Altimeter Remains Operational Pilot will: Controller will: GLYPH<C0083> Cross check stand − by altimeter GLYPH<C0083> Notify ATC of operation with single primary altimeter GLYPH<C0083> If unable to confirm primary altimeter accuracy, follow actions for failure of all primary altimeters GLYPH<C0083> Acknowledge operation with single primary altimeter Pilot will: Controller will: GLYPH<C0083> Contact ATC and state “Unable RVSM Due Equipment” GLYPH<C0083> Request clearance out of RVSM airspace unless operational situation dictates otherwise GLYPH<C0083> Provide 2,000 feet vertical separation or appropriate horizontal separation GLYPH<C0083> Clear aircraft out of RVSM airspace unless operational situation dictates otherwise Pilot should: Controller should: GLYPH<C0083> Contact ATC and request vector, FL change or, if capable, a lateral offset GLYPH<C0083> Issue vector, FL change or lateral offset clearance, traffic permitting See Paragraph 4 − 6 − 7, Guidance on Wake Turbulence. Paragraph 4 − 6 − 6 explains “traffic permitting.” 8/15/19 AIM  Operational Policy/Procedures for Reduced Vertical Separation Minimum (RVSM) in the Domestic U.S., Alaska, Offshore Airspace and the San Juan FIR 4 − 6 − 8