Accession Number : ADA116495

Title :   Evaluation of Noise Control Technology and Alternative Noise Certification Procedures for Propeller-Driven Small Airplanes.

Descriptive Note : Final rept.,

Corporate Author : WYLE LABS EL SEGUNDO CA

Personal Author(s) : Brown,David ; Sutherland,Louis C

PDF Url : ADA116495

Report Date : May 1982

Pagination or Media Count : 224

Abstract : This report considers the effectiveness of current noise regulations in Appendix F of FAR Part 36, examines the potential effectiveness of future technology to achieve further noise reduction, and evaluates a number of new concepts for noise certification procedures for propeller-driven small aircraft. The latter were based, in part, on results of a flight test program carried out with Cessna Aircraft Company, to evaluate the utility of takeoff noise tests and the possible use of sound exposure level as a suitable metric for noise certification of the subject aircraft. The study indicates that existing regulations have been effective in stimulating development of quieter propellers for the existing fleet of propeller-driven small aircraft. However, it does not appear economically feasible to achieve more noise reduction in most of this fleet using existing technology with the possible exceptions of some of the two-engine aircraft. However, application of future noise reduction technology, primarily for quieter propellers, should allow a reduction in current noise limits by about 6 dB and should reduce levels of the noisiest aircraft in the current fleet by as much as 10 dB. A takeoff test is appropriate for all propeller aircraft except those equipped with cruise-optimized fixed-pitch propellers. For this test, the current level flyover test appears to represent the noisiest operating condition.

Descriptors :   *Aircraft engine noise, *Propeller noise, *Aerial propellers, *Commercial aircraft, Federal law, Regulations, Operational effectiveness, Aircraft industry, Noise reduction, Takeoff, Standards, Measurement, Noise pollution, Feasibility studies, Data management, Tables(Data), Test methods, Methodology, Commercial aviation

Subject Categories : Civilian Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE