Manicured garden
12th Feb 2016, 19:21
Hello guys!
Just a quick question; what are the differences between Noise Certificates of airplanes? For example; my company has Chapter 4 Noise certificate but how about chapter 2 and/or 3?
Where amy I find the information about these certificate differences?
Skyjob
12th Feb 2016, 20:38
Have a look here (https://easa.europa.eu/document-library/type-certificates?search=&date_filter%5Bvalue%5D%5Byear%5D=&product%5B%5D=10&=Apply) for a listing of certificates if that is what you are looking for.
On the EASA website you can find information here (https://easa.europa.eu/document-library/noise-type-certificates-approved-noise-levels) for noise type certification.
The TCDSN documents an aircraft type's compliance with the applicable requirements for noise certification and records the associated EASA approved noise level(s).
(EU) No. 748/2012 refers to:
21.A.18 Designation of applicable environmental protection requirements and certification specifications
(a) The applicable noise requirements for the issue of a type-certificate for an aircraft are prescribed according to the
provisions of Chapter 1 of Annex 16, Volume I, Part II to the Chicago Convention and:
1. for subsonic jet aeroplanes, in Volume I, Part II, Chapters 2, 3 and 4, as applicable;
2. for propeller-driven aeroplanes, in Volume I, Part II, Chapters 3, 4, 5, 6 and 10, as applicable;
3. for helicopters, in Volume I, Part II, Chapters 8 and 11, as applicable; and
4. for supersonic aeroplanes, in Volume I, Part II, Chapter 12, as applicable.
FAA publishes data here (http://www.faa.gov/documentLibrary/media/Advisory_Circular/AC36-4C.pdf)
Section B36.5 Maximum Noise Levels
Except as provided in section B36.6 of this appendix, maximum noise levels, when determined in accordance with the noise evaluation methods of appendix A of this part, may not exceed the following:
(a) For acoustical changes to Stage 1 airplanes, regardless of the number of engines, the noise levels prescribed under § 36.7(c) of this part.
(b) For any Stage 2 airplane regardless of the number of engines:
(1) Flyover: 108 EPNdB for maximum weight of 600,000 pounds or more; for each halving of maximum weight (from 600,000 pounds), reduce the limit by 5 EPNdB; the limit is 93 EPNdB for a maximum weight of 75,000 pounds or less.
(2) Lateral and approach: 108 EPNdB for maximum weight of 600,000 pounds or more; for each halving of maximum weight (from 600,000 pounds), reduce the limit by 2 EPNdB; the limit is 102 EPNdB for a maximum weight of 75,000 pounds or less.
(c) For any Stage 3 airplane:
(1) Flyover.
(i)For airplanes with more than 3 engines: 106 EPNdB for maximum weight of 850,000 pounds or more; for each halving of maximum weight (from 850,000 pounds), reduce the limit by 4 EPNdB; the limit is 89 EPNdB for a maximum weight of 44,673 pounds or less;
(ii) For airplanes with 3 engines: 104 EPNdB for maximum weight of 850,000 pounds or more;
for each halving of maximum weight (from 850,000 pounds), reduce the limit by 4 EPNdB; the limit is 89 EPNdB for a maximum weight of 63,177 pounds or less; and
(iii) For airplanes with fewer than 3 engines: 101 EPNdB for maximum weight of 850,000 pounds or more; for each halving of maximum weight (from 850,000 pounds), reduce the limit by 4 EPNdB; the limit is 89 EPNdB for a maximum weight of 106,250 pounds or less.
(2) Lateral, regardless of the number of engines: 103 EPNdB for maximum weight of 882,000 pounds or more; for each halving of maximum weight (from 882,000 pounds), reduce the limit by 2.56 EPNdB; the limit is 94 EPNdB for a maximum weight of 77,200 pounds or less.
(3) Approach, regardless of the number of engines: 105 EPNdB for maximum weight of 617,300 pounds or more; for each halving of maximum weight (from 617,300 pounds), reduce the limit by 2.33 EPNdB; the limit is 98 EPNdB for a maximum weight of 77,200 pounds or less
Finally a good presentation here (http://www.icao.int/Meetings/Green/Documents/day%201pdf/session%202/2-Dickson.pdf)