TBL ENR 1.1.3
Pilot/Controller Phraseology
Message Phraseology
For a controller to ascertain the RVSM approval status of an aircraft: (call sign) confirm RVSM approved
Pilot indication that flight is RVSM approved Affirm RVSM
Pilot report of lack of RVSM approval (non.RVSM status). Pilot will report non.RVSM status, as follows: a. On the initial call on any frequency in the RVSM airspace and . . . b. In all requests for flight level changes pertaining to flight levels within the RVSM airspace and . . . c. In all read backs to flight level clearances pertaining to flight levels within the RVSM airspace and . . . d. In read back of flight level clearances involving climb and descent through RVSM airspace (FL 290 . 410) Negative RVSM, (supplementary information, e.g., “Certification flight”).
Pilot report of one of the following after entry into RVSM airspace: all primary altimeters, automatic altitude control systems or altitude alerters have failed. (See paragraph 38.9, Contingency Actions: Weather Encounters and Aircraft System Failures). NOTE.
This phrase is to be used to convey both the initial indication of RVSM aircraft system failure and on initial contact on all frequencies in RVSM airspace until the problem ceases to exist or the aircraft has exited RVSM airspace. Unable RVSM Due Equipment
ATC denial of clearance into RVSM airspace Unable issue clearance into RVSM airspace, maintain FL
*Pilot reporting inability to maintain cleared flight level due to weather encounter. (See paragraph 38.9, Contingency Actions: Weather Encounters and Aircraft System Failures). *Unable RVSM due (state reason) (e.g., turbulence, mountain wave)
ATC requesting pilot to confirm that an aircraft has regained RVSM.approved status or a pilot is ready to resume RVSM Confirm able to resume RVSM
Pilot ready to resume RVSM after aircraft system or weather contingency Ready to resume RVSM
Federal Aviation Administration Twentieth Edition
38.9 Contingency Actions: Weather Encoun-ters and Aircraft System Failures
TBL ENR 1.1.4 provides pilot guidance on actions to take under certain conditions of aircraft system failure and weather encounters. It also describes 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.
TBL ENR 1.1.4
Contingency Actions: Weather Encounters and Aircraft System Failures
Initial Pilot Actions in Contingency Situations
Initial pilot actions when unable to maintain flight level (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 feet
Pilot will: Controller will:
When experiencing severe turbulence and/or Vector aircraft to avoid merging target with
MWA induced altitude deviations of traffic at adjacent flight levels, traffic permitting
approximately 200 feet or greater, pilot will
contact ATC and state “Unable RVSM Due (state Advise pilot of conflicting traffic
reason)” (e.g., turbulence, mountain wave) Issue FL change or re.route, traffic permitting
If not issued by the controller, request vector
clear of traffic at adjacent FLs Issue PIREP to other aircraft
If desired, request FL change or re.route
Report location and magnitude of turbulence or
MWA to ATC
See paragraph 38.6, Guidance on Severe Turbulence Paragraph 38.6 explains “traffic permitting.”
and Mountain Wave Activity (MWA), for detailed
guidance.
Mountain Wave Activity (MWA) Encounters . General
Pilot actions:
Contact ATC and report experiencing MWA
If so desired, pilot may request a FL change or re.route
Report location and magnitude of MWA to ATC See paragraph 38.6 for guidance on MWA. Controller actions:
Advise pilot of conflicting traffic at adjacent FL
If pilot requests, vector aircraft to avoid merging target with traffic at adjacent RVSM flight levels, traffic permitting
Issue FL change or re.route, traffic permitting
Issue PIREP to other aircraft Paragraph 38.6 explains “traffic permitting.”
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