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Pilot: "Yankee 123, FL310, unable RVSM due mountain wave".
Controller: "Yankee 123, fly heading 290; traffic twelve o'clock, 10 miles, opposite direction; eastbound MD-80 at FL320"; (or the controller may issue a vector to the MD 80 traffic to avoid Yankee 123)
4 FLIGHT LEVEL CHANGE OR RE-ROUTE - To leave airspace where MWA or severe turbulence is being encountered, the pilot may request a FL change and/or reroute, if necessary.
(3) GUIDANCE ON WAKE TURBULENCE -
(a)
Pilots should be aware of the potential for wake turbulence encounters in DRVSM airspace. Experience has shown that such encounters are generally moderate or less in magnitude.

(b)
Pilots should be alert for wake turbulence when operating:

1 In the vicinity of aircraft climbing or descending through their altitude.
2 Approximately 10-30 NM after passing 1000' below opposite direction traffic.
3 Approximately 10-30 NM behind and 1000' below same-direction traffic.
(c) Pilots 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.
NOTE 2: In domestic US airspace, pilots must request clearance to fly a lateral offset. The Strategic Lateral Offset Program used in oceanic airspace does not apply in domestic US RVSM Airspace.
(AFFSA/AFFSA FIL 05-476)
i. PILOT/CONTROLLER PHRASEOLOGY:
Standard Phraseology for DRVSM Operations
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 will report lack of RVSM approval (non-RVSM status): 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 (FL290-410)  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 j ). (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 . 
　
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