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Reduction of JT8D Powered Aircraft Noise By Engine Refanning
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Abstract
The purpose of the Refan Program is to establish the technical feasibility of substantially reducing the noise levels of existing JT8D powered aircraft. This would be accomplished by retrofitting the existing fleet with quieter refan engines and new acoustically treated nacelles. No major technical problems exist that preclude the development and installation of refanned engines on aircraft currently powered by the JT8D engine. The refan concept is technically feasible and provides calculated noise reductions of from 7 to 8 EPNdB for the B727-200 aircraft and from 10 to 12 EPNdB for the DC-9-32 aircraft at the FAR Part 36 measuring stations. These noise levels are lower than both the FAR Part 36 noise standards and the noise levels of the wide-body DC-10-10. Corresponding reductions in the 90 EPNdB footprint area are estimated to vary from about 70% for the DC-9 to about 80% for the B727. The refanned aircraft should perform typical range/payload missions with a negligible effect on block fuel. Production retrofit kits could be available in 1976 for the DC-9 at a unit cost of about $1.0 million and in 1977 for the B727 at a unit cost of $1.7 million.
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Citation
Stitt, L. and Medeiros, A., "Reduction of JT8D Powered Aircraft Noise By Engine Refanning," SAE Technical Paper 740490, 1974, https://doi.org/10.4271/740490.Also In
References
- Callaghan, J. T. Donelson, J. E. Morelli, J. P. The Effects on Cruise Drag of Installing Long-Duct Refan-Engine Nacelles on the McDonnell Douglas DC-8-50 and -61 NASA CR-121218 May 1973
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- Chrisenberry, H. E. Doss, P. G. Kressly, A. E. Prichard, R. D. Thorndike, C. S. The Results of a Low-Speed Wind Tunnel Test to Investigate the Effects of Installing Refan JT8D Engines on the McDonnell Douglas DC-9-30 NASA CR-121220 June 1973
- Douglas Aircraft Company DC-9/JT8D Refan Phase I, Final Report. NASA CR-121252 November 1973
- Shirkey, M. D. The Results of Low-Speed Wind Tunnel Tests to Investigate the Effects of the NASA Refan JT8D Engine Nacelles on the Stability and Control Characteristics of the Boeing 727-200 NASA CR-134503 October 1973
- Kaldschmidt, G. Syltebo, B. E. Ting, C. T. 727 Airplane Center Duct Inlet Low-Speed Performance Confirmation Model Test for Refanned JT8D Engines. Phase II NASA CR-134534 November 1973
- Kupcis, E. A. The Results of a High-Speed Wind Tunnel Test to Investigate the Effects of the NASA Refan JT8D Engine Nacelles on the Stability and Control Characteristics of the Boeing 727 Airplane NASA CR-134545 December 1973
- Easterbrook, W. G. Carlson, R. B. Cruise Drag Results From High Speed Wind Tunnel Tests of NASA Refan JT8D Engine Nacelles on the Boeing 727-200 NASA CR-134546 December 1973