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Guidance concerning Air Navigation in and above the NAT MNPSA


300m (1 000ft) Vertical Separation Minimum between FL290 and FL410 inclusive.) and detailed in designated FAA document, AC91-85, and in JAA document, TGL6, Revision 1 (i.e. Temporary Guidance Leaflet No. 6) (these documents can be accessed via:

http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/enroute/rvsm/ and http://www.ecacnav.com/rvsm/library.htm respectively).

      • 9.1.6

        The Minimum Equipment List (MEL) for RVSM operations must be strictly observed

      • 9.1.7

        A ‘W’ must be entered into Item 10 of the ICAO flight plan to indicate that the aircraft is

approved for flight at RVSM levels; the letter ‘X’ must still be included to show that the aircraft satisfies MNPS lateral navigation performance requirements.

Note: With effect from 5 June 2008 the previous West Atlantic Route System (WATRS) together with the Atlantic portion of Miami Oceanic Airspace and the San Juan FIR has been designated "WATRS Plus Airspace”. RNP-10 or RNP-4 Approval is required in order to bene it from the 50 NM minimum lateral separation employed here. Any MNPSA Aircra t intending to also ly in this WATRS Plus airspace should ensure that its RNP Approval status is included in the Flight Plan. Speci ically such operators should:

  • i)

    annotate ICAO Flight Plan Item 10 (Equipment) with the letters “R” and “Z”, and

  • ii)

    annotate Item 18 (Other Information) with, as appropriate, “NAV/RNP10” or “NAV/RNP4”

(no spaces).

Full details can be found at h t t p : / / w w w . f a a . g o v / a b o u t / o f f i c e _ o r g / h e a d q u a r t e r s _ o f f i c e s / a t o / s e r v i c e _ u n i t s / e n r o u t e / o c e a n i c / .


Most flights through the NAT MNPSA enter via European and/or North American RVSM

airspace. These flights will have been required to perform standard pre-flight checks of altimeters for their initial operations in those continental RVSM areas. Other flights departing directly into the NAT Region

should ensure that such checks are made.


Special arrangements exist for non-RVSM approved aircraft/operators to climb or descend

through NAT RVSM airspace; and in very specific circumstances arrangements may be made for non- approved aircraft to fly at RVSM levels in the NAT Region. Both such arrangements are explained above in

Chapter 1 (See Special Arrangements for Non-RVSM Approved Aircraft – paragraph 1.6).

In-Flight - Before Operating in MNPS Airspace


Most flights will approach the MNPSA through European or North American RVSM

airspaces. It is therefore expected that continuous monitoring of the serviceability of the aircraft’s height keeping systems will have been undertaken. Nevertheless, in view of the significant change of operating environment (i.e. to indirect surveillance and communications) it is recommended that a final confirmation of the aircraft systems serviceability is performed immediately prior to entering the NAT MNPSA. An altimeter cross check should be carried out; at least two primary altimeters must agree within plus or minus 200 ft. The readings of the primary and standby altimeters should be recorded to be available for use

in any possible subsequent contingency situations.

NAT Doc 007


Edition 2010

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