Appendix C Noise Levels for Subsonic Transport Category and Turbojet Powered 1 C36.1 Noise measurement and evaluation. 1 C36.3 Noise measuring points. Compliance with the noise level standards of § C36.5 must be shown (a) For takeoff, at a point 3.5 nautical miles from the start of the takeoff roll on the extended centerline of the runway; (b) For approach, at a point 1 nautical mile from the threshold on the extended centerline of the runway; and (c) For the sideline, at the point, on a line parallel to and 0.25 nautical miles from the extended centerline of the runway, where the noise level after liftoff is greatest, except that, for airplanes powered by more than three turbojet engines, this distance must be 0.35 nautical miles. C36.5 Noise levels. (a) General. Except as provided in paragraphs (b) and (c) of this section, it must be shown by flight test that the noise levels of the airplane, at the measuring points described in C36.3, do not exceed the following (with appropriate interpolation between weights); (1) For approach and sideline, 108 EPNdB for maximum weights of 600,000 lbs. or more, less 2 EPNdB per halving of the 600,000 lbs. maximum weight down to 102 EPNdB for maximum weights of 75,000 lbs. and under. (2) For takeoff, 108 EPNdB for maximum weights of 600,000 lbs. or more, less 5 EPNdB per halving of the 600,000 lb. maximum weight down to 93 EPNdB for maximum weights of 75,000 lbs. and under. (b) Tradeoff. The noise levels in paragraph (a) may be exceeded at one or two of the measuring points prescribed in § C36.3, if (1) The sum of the exceedance is not greater than 3 EPNdB; (2) No exceedance is greater than 2 EPNdB; and (3) The exceedances are completely offset by reductions at other required measuring points. (c) Prior applications. For applications made before December 1, 1969, for airplanes powered by more than three turbojet engines with bypass ratios of two or more, the value prescribed in paragraph (b)(1) of this section may not exceed 5 EPNdB and the value prescribed in paragraph (b)(2) of this section may not exceed 3 EPNdB. C36.7 Takeoff test conditions. (a) This section applies to all takeoffs conducted in showing compliance with this Part. (b) Takeoff power or thrust must be used from the start of the takeoff to the point at which an altitude of at least 1,000 feet above the runway is reached, except that, for airplanes powered by more than three turbojet engines, this altitude must not be less than 700 feet. (c) Upon reaching the altitude specified in paragraph (b) of this section, the power or thrust may not be reduced below that power or thrust that will provide level flight with ne engine inoperative, or below that power or thrust that will maintain a climb gradient of at least 4 percent, whichever power or thrust is greater. (d) A speed of at least V2+10 knots must be attained as soon as practicable after liftoff, and must be maintained throughout the takeoff noise test. (e) A constant takeoff configuration, selected by the applicant, must be maintained throughout the takeoff noise test, except that the landing gear may be retracted. 1 C36.9 Approach test conditions. (a) This section applies to all approaches conducted in showing compliance with this Part. (b) The airplane's configuration must be that used in showing compliance with the land ing requirements in the airworthiness regulations constituting the type certification basis of the airplane. If more than one configuration is used in showing compliance with the landing requirements in the airworthiness regulations constituting the type certification basis of the airplane, the configuration that is most critical from a noise standpoint must be used. (c) The approaches must be conducted with a steady glide angle of 3° ±0.5° and must be continued to a normal touchdown with no airframe configuration change. (d) A steady approach speed of not less than 1.30 Vs+10 knots must be established and maintained over the approach measuring point. (e) All engines must be operating at approximately the same power or thrust. (Amdt. 36-1, effective Dec. 1, 1969, published in 34 F.R. 18815, Nov. 25, 1969) PUBLICATIONS IMPLEMENTING ENVIRONMENTAL PROVISIONS EXHIBIT 4 DOT Order 5610.1 Issued on October 7, 1970 Implementation of Section 102(2)(c) of the National This order outlines procedures for the Department of Transportation FAA Order 5050.1 Issued on April 4, 1970 Potential Impact of Section 4(f) of DOT Act This order requires Airports program personnel to consider the potential adverse impact of Federally aided airport development upon the Nation's environment in timely fashion and provides interim guidance for the processing of potential cases of conflict. FAA Order 5050.2 Issued on July 7, 1970 Interim Instructions for Processing Airport This order provides interim guidance for the processing of proposed airport development actions potentially involving Federal financial aid (Airport Development Aid Program) and which have the potential of significantly affecting the quality of the human environment. FAA Order 6900.4 Issued on June 30, 197Q FAA Plans for Meeting Mandate of National Environmental This order outlines basic policy, a plan of action, and establishes responsibility for ensuring that the FAA take all possible measures, with respect to its facilities, plans, programs, policies, and operations, to lead in the nationwide effort to protect and enhance the quality of our environment and natural resources. FAA Order 5900.1 Issued on September 25, 1970 Planning Grant Program (PGP) Handbook This order establishes an interim Planning Grant Program Handbook. The objective of the Program is to promote the effective location and development of airports and the development of a National Airport System Plan. These interim guidelines assist the public and agency personnel in implementing section 13 of the Airport and Airway Development Act of 1970, which authorizes grants of funds to public agencies for airport master planning and to planning agencies for system planning. FAA Order 5100.15 Issued on September 2, 1970 Subject: FAA Participation in Environmental Hearings This order provides policy guidance on participation by Federal Aviation Administration (FAA) personnel in environmental hearings conducted by sponsors pursuant to the Airport and Airway Development Act of 1970, P.L. 91-258. FAA Advisory Circular 150/5100-7 Issued on January 4, 1971 Subject: Requirement for Public Hearings in the Airport Development This advisory circular provides guidance to sponsors of airport development projects under the Airport Development Aid Program (ADAP) on the necessity for and conduct of public hearings. |