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ACTION: Northwest Mountain Region Revision to AC 150/5370-10D, Standards for Specifying Construction of Airports, Notice D-1 TO: Airport Sponsors, Consultants, Contractors, Mt. Aeronautics: Please see the attached Northwest Mountain Region Revision to AC 150/5370-10D, Standards for Specifying Construction of Airports, Notice D-1. All previous notices are now canceled. This revision (Notice D-1) shall be incorporated into AC 150/5370-10D, dated September 30, 2008, for all new projects under design in the Northwest Mountain Region. This change will be in effect until the next revision. Notice D-1 can also be found under "Documents" at: http://www.faa.gov/airports/northwest_mountain/engineering/construction_ resources/. Steve L. Engebrecht, P.E. Civil Engineer Helena Airports District Office steve.engebrecht@faa.gov PH (406) 449-5279 FAX (406) 449-5274