IFR MINIMUM SAFE ALTITUDES Section 60.107 (d) presently provides tiiat Where the Administrator has not established minimum altitudes for routes or portions of routes over Which an operation Is conducted such operations shall be conducted at not less than 1,000 feet above the highest obstacle within a horizontal radius of 5 miles from the aircraft. The purpose of this amendment Is to modify 1 60.107 (d) by prescribing that such opera tions shall be conducted atnot less than 1,000 feet above the

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... ighest obstacle within a horizontal distance of 5 miles from the center of the course intended to be flown. This amendment also specifies the standards Which the Administrator has been and shall be guided by in determining minimum altitudes for particular routes. • This change in wording clarifies the existing rule and at the same time renders it consistent with the minimum flight altitudes presently contained in the Flight Information Manual. Since this amendment is minor in nature and Imposes no additional burden on any person, notice and public procedure hereon are unnecessary, and the amendment may be made effective without prior notice. In consideration of the foregoing the Civil Aeronautics Board hereby amends Part 60 of Che civil Air Regulations (14 CFR, Part 60, as amended) effective March 28, 1B48: By amending i 60.107 (d) to read as follows; (<M IFR operations. The minimum IFR altitude established by the Administrator for that portion of the route over which the operation Is conducted. Such altitude shall be that Which the safe conduct of flight permits or requires considering the character of the terrain being traversed, the meteorological services and navigational facilities available, and other flight conditions. Where the Administrator has not established such a minimum, operations shall be conducted at not less than 1,000 feet above the highest obstacle within a horizontal distance of 5 miles from the center of the course Intended to be flown. NOTE: when minimum altitudes are established by the Administrator for particular routes, such altitudes will be published In the CAA Flight Information Manual, for sale by the Superintendent of Documents, U.S. Government Printing Office,