(b)
Operators/aircraft that file ICAO flight plans that include flight in domestic US RVSM Airspace must file letter "W" in block 10 to indicate RVSM authorization.

(4)
IMPORTANCE OF FLIGHT PLAN EQUIPMENT SUFFIXES - The operator must file the appropriate equipment suffix in the equipment block of the DD Form 175, FAA or ICAO Flight Plan. The equipment suffix informs ATC:

(a)
Whether or not the operator and aircraft are authorized to fly in RVSM Airspace.

(b)
The navigation and/or transponder capability of the aircraft (e.g., Advanced RNAV, Transponder with Mode C).

(5)
SIGNIFICANT ATC USES OF THE FLIGHT PLAN EQUIPMENT SUFFIX INFORMATION ARE -

(a) To issue or deny clearance into RVSM Airspace.

(b)
To apply a 2000' vertical separation minimum in RVSM Airspace to aircraft that are not authorized for RVSM, but are in one of the limited categories that the FAA has agreed to accommodate.

(c)
To determine if the aircraft has "Advanced RNAV" capabilities and can be cleared to fly procedures for which that capability is required.

h.
PILOT RVSM OPERATING PRACTICES AND PROCEDURES -

(1)
RVSM MANDATE - If either the operator or the aircraft or both have not received RVSM authorization (non-RVSM aircraft), the pilot will neither request nor accept a clearance into RVSM Airspace unless:

(a)
The flight is conducted by a non-RVSM DoD, Lifeguard, certification/development or foreign state (government) aircraft in accordance with paragraph k.

(b)
The pilot intends to climb to or descend from FL430 or above in accordance with paragraph l.

(c) An emergency situation exists.

(2)
GUIDANCE ON SEVERE TURBULENCE AND MOUNTAIN WAVE ACTIVITY (MWA)

(a)
The information and practices in this section are provided to emphasize to pilots and controllers the importance of taking appropriate action in RVSM Airspace when aircraft experience severe turbulence and/or MWA that is of sufficient magnitude to significantly affect altitude-keeping.

(b)
SEVERE TURBULENCE - Severe turbulence causes large, abrupt changes in altitude and/or attitude usually accompanied by large variations in indicated airspeed. Aircraft may be momentarily out of control. Encounters with severe turbulence must be remedied immediately in any phase of flight. Severe turbulence may be associated with MWA.

(c)
PRIORITY FOR CONTROLLER APPLICATION OF MERGING TARGET PROCEDURES -

1 EXPLANATION OF MERGING TARGET PROCEDURES - As described below, ATC will use "merging target procedures" to mitigate the effects of both severe turbulence and MWA. These procedures have been adapted from existing procedures published in FAA Order 7110.65, paragraph 5-1-8 (Merging Target Procedures). Paragraph 5-1-8 calls for enroute controllers to advise pilots of potential traffic that they perceive may fly directly above or below his/her aircraft at minimum vertical separation. In response, pilots are given the option of requesting a radar vector to ensure their radar target will not merge or overlap with the traffic's radar target.
　
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