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d. In read back of flight level clearances involving
climb and descent through RVSM airspace
(FL 290 − 410)
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
AIP ENR 1.1−53
United States of America 15 MAR 07
Federal Aviation Administration Nineteenth Edition
38.9Contingency Actions:Weather Encounters
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
MWA induced altitude deviations of
approximately 200 feet or greater, pilot will
contact ATC and state Unable RVSM Due (state
reason)" (e.g., turbulence, mountain wave)
If not issued by the controller, request vector
clear of traffic at adjacent FLs
If desired, request FL change or re−route
Report location and magnitude of turbulence or
MWA to ATC
Vector aircraft to avoid merging target with
traffic at adjacent flight levels, traffic permitting
Advise pilot of conflicting traffic
Issue FL change or re−route, traffic permitting
Issue PIREP to other aircraft
See paragraph 38.6, Guidance on Severe Turbulence
and Mountain Wave Activity (MWA), for detailed
guidance.
Paragraph 38.6 explains traffic permitting."
ENR 1.1−54 AIP
15 MAR 07 United States of America
Nineteenth Edition Federal Aviation Administration
Mountain Wave Activity (MWA) Encounters − General
Pilot actions: Controller 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
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
See paragraph 38.6 for guidance on MWA. Paragraph 38.6 explains traffic permitting."
NOTE−
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.
Wake Turbulence Encounters
Pilot should: Controller should:
Contact ATC and request vector, FL change or,
if capable, a lateral offset
Issue vector, FL change or lateral offset clearance,
traffic permitting
See paragraph 38.7, Guidance on Wake Turbulence. Paragraph 38.6 explains traffic permitting."
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