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FL320" (or the controller may issue a vector to the
MD−80 traffic to avoid Yankee 123).
AIP ENR 1.1−51
United States of America 15 MAR 07
Federal Aviation Administration Nineteenth Edition
38.6.3.3MWA.When pilots encounter MWA, they
should contact ATC and report the magnitude and
location of the wave activity. When a controller
makes a merging targets traffic call, the pilot may
request a vector to avoid flying directly over or under
the traffic. In situations where the pilot is
experiencing altitude deviations of 200 feet or
greater, the pilot will request a vector to avoid traffic.
Until the pilot reports clear of MWA, the controller
will apply merging target vectors to one or both
passing aircraft to prevent their targets from merging:
EXAMPLE−
Yankee 123, FL 310, unable RVSM due mountain wave."
Yankee 123, fly heading 290; traffic twelve o’clock,
10miles, opposite direction; eastbound MD−80 at
FL320" (or the controller may issue a vector to the
MD−80 traffic to avoid Yankee 123).
38.6.3.4FL Change or Re−route.To leave airspace
where MWA or severe turbulence is being
encountered, the pilot may request a FL change
and/or re−route, if necessary.
38.7Guidance on Wake Turbulence
38.7.1Pilots should be aware of the potential for
wake turbulence encounters in RVSM airspace.
Experience gained since 1997 has shown that such
encounters in RVSM airspace are generally moderate
or less in magnitude.
38.7.2Prior to DRVSM implementation, the FAA
established provisions for pilots to report wake
turbulence events in RVSM airspace using the NASA
Aviation Safety Reporting System (ASRS). A
Safety Reporting" section established on the FAA
RVSM Documentation webpage provides contacts,
forms, and reporting procedures.
38.7.3To date, wake turbulence has not been
reported as a significant factor in DRVSM
operations.European authorities also found that
reports of wake turbulence encounters did not
increase significantly after RVSM implementation
(eight versus seven reports in a ten−month period). In
addition, they found that reported wake turbulence
was generally similar to moderate clear air
turbulence.
38.7.4Pilot Action to Mitigate Wake Turbulence
Encounters
38.7.4.1Pilots should be alert for wake turbulence
when operating:
a)In the vicinity of aircraft climbing or
descending through their altitude.
b)Approximately 10−30 miles after passing
1,000feet below opposite−direction traffic.
c)Approximately 10−30 miles behind and
1,000feet below same−direction traffic.
38.7.4.2Pilots encountering or anticipating wake
turbulence in DRVSM airspace have the option of
requesting a vector, FL change, or if capable, a lateral
offset.
NOTE−
1.Offsets of approximately a wing span upwind generally
can move the aircraft out of the immediate vicinity of
another aircraft’s wake vortex.
2.In domestic U.S. airspace, pilots must request clearance
to fly a lateral offset. Strategic lateral offsets flown in
oceanic airspace do not apply.
38.7.5The FAA will track wake turbulence events as
an element of its post implementation program. The
FAA will advertise wake turbulence reporting
procedures to the operator community and publish
reporting procedures on the RVSM Documentation
Webpage (See address in paragraph38.3, Aircraft
and Operator Approval Policy/Procedures, RVSM
Monitoring and Databases for Aircraft and Operator
Approval.
38.8Pilot/Controller Phraseology
TBL ENR 1.1−3 shows standard phraseology that
pilots and controllers will use to communicate in
DRVSM operations.
ENR 1.1−52 AIP
15 MAR 07 United States of America
Nineteenth Edition Federal Aviation Administration
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:
Negative RVSM, (supplementary information,
e.g.,Certification flight").
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 . . .
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