ATC requesting pilot to
Confirm able to resume RVSM confirm that an aircraft has regained RVSM-approved status or a pilot is ready to resume RVSM
Pilot ready to resume RVSM
Ready to resume RVSM after aircraft system or weather contingency
j. CONTINGENCY ACTIONS: WEATHER ENCOUNTERS AND AIRCRAFT SYSTEM FAILURES - The following figures provide pilot guidance on actions to take under certain conditions of aircraft system failure and weather encounters. They also describe the expected ATC controller actions in these situations. It is recognized that the pilot and controller will use judgment to determine the action most appropriate to any given situation.
Contingency Actions: Weather Encounters and
Aircraft System Failures
Initial Pilot Actions in Contingency Situations
Initial Pilot Actions when unable to maintain FL or unsure of
aircraft altitude-keeping capability:
-
Notify ATC and request assistance as detailed below.
-
Maintain cleared flight level, to the extent possible, while evaluating the situation
-
Watch for conflicting traffic both visually and by reference to TCAS, if equipped
-
Alert nearby aircraft by illuminating exterior lights (commensurate with aircraft limitations)
Severe Turbulence and/or Mountain
Wave Activity (MWA) Induced
Altitude Deviations of Approximately 200’
Pilot will: Controller will:
-When experiencing severe -Vector aircraft to avoid turbulence and/or MWA
merging target with traffic at induced altitude deviations
adjacent FL, traffic
of approximately 200’ or
permitting
greater, pilot will contact ATC
-Advise pilot of conflicting and state "Unable RVSM Due
traffic
(state reason)" (e.g.,
-Issue FL change or
turbulence, mountain wave)
re-route, traffic permitting -If not issued by the
-Issue PIREP to other aircraft controller, request vector clear of traffic at adjacent FL
-If desired, request FL change or reroute
-Report location and magnitude of turbulence or MWA to ATC
Mountain Wave Activity (MWA) Encounters - General
NOTE: MWA encounters do not necessarily result in altitude deviations on the order of 200’. The guidance below is intended to address less significant MWA encounters.
Pilot actions: Controller actions:
-Contact ATC and report -Advise pilot of conflicting experiencing MWA
traffic at adjacent FL -If so desired, pilot may
-If pilot requests, vector
request a FL change or re-
aircraft to avoid merging
route
target with traffic at adjacent -Report location and
RVSM FL, traffic permitting magnitude of MWA to ATC
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