3.6.2.1 d) 14 CFR Part 36 specifies the day speeds and the acoustic reference speed to be the minimum approved value of V2 +10 kt, or the all.engines operating speed at 35 feet (for turbine.engine powered airplanes) or 50 feet (for reciprocating.engine powered airplanes), whichever speed is greater as determined under the regulations constituting the type certification basis of the airplane. The test must be conducted at the test day speeds ±3 kt.
3.7.4 If a take.off test series is conducted at weights other than the maximum take.off weight for which noise certification is requested: a) at least one take.off test must be at or above that maximum weight; b) each take.off test weight must be within +5 or .10 percent of the maximum weight. If an approach test series is conducted at weights other than the maximum landing weight for which certification is requested: a) at least one approach test must be conducted at or above that maximum weight; b) each test weight must exceed 90 percent of the maximum landing weight. Total EPNL adjustment for variations in approach flight path from the reference flight path and for any difference between test engine thrust or power and reference engine thrust or power must not exceed 2 EPNdB.
Chapter 5
5.1.1 Applies to all large transport category aircraft (as they do to all subsonic turbo.jet aircraft regardless of category). Commuter category aircraft, propeller.driven airplanes below 8,640 kg (19,000 lb) are subject to 14 CFR Part 36, Appendix F or to Appendix G, depending upon the date of completion of the noise certification tests.
Chapter 6
6.1.1 Applies to new, all propeller.driven airplane types below 19,000 lb (8,640 kg.) in the normal, commuter, utility, acrobatic, transport, or restricted categories for which the noise certification tests are completed before 22 December 1988.
Chapter 8
General 14 CFR Part 36 (Section 36.1 (h)) defines Stage 1 and Stage 2 noise levels and Stage 1 and Stage 2 helicopters. These definitions parallel those used in 14 CFR Part 36 for turbo.jets and are used primarily to simplify the acoustical change provisions in Section 36.11. 14 CFR Part 36 (Section 36.805(c)) provides for certain derived versions of helicopters for which there are no civil prototypes to be certificated above the noise level limits.
8.1.1 a) Applicable to new helicopter types for which application for an original type certificate was made on or after 6 March 1988.
8.1.1 b) Applicable only to “acoustical changes’’ for which application for an amended or supplemental type certificate was made on or after 6 March 1988.
8.4 14 CFR Part 36 Appendix H specifies a slightly different rate of allowable maximum noise levels as a function of helicopter mass. The difference can lead to a difference in the calculated maximum noise limits of 0.1 EPNdB under certain roundoff condition.
8.6.3.1 b) Does not include the VNE speeds.
8.7 14 CFR Part 36 Appendix H does not permit certain negative corrections. Annex 16 has no equivalent provision.
8.7.4 EPNL correction must be less than 2.0 EPNdB for any combination of lateral deviation, height, approach angle and, in the case of flyover, thrust or power. Corrections to the measured data are required if the tests were conducted below the reference weight. Corrections to the measured data are required if the tests were conducted at other than reference engine power.
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