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Effect of advanced aircraft noise reduction technology on the 1990 projected noise environment around Patrick Henry AirportA study has been conducted of the future noise environment of Patric Henry Airport and its neighboring communities projected for the year 1990. An assessment was made of the impact of advanced noise reduction technologies which are currently being considered. These advanced technologies include a two-segment landing approach procedure and aircraft hardware modifications or retrofits which would add sound absorbent material in the nacelles of the engines or which would replace the present two- and three-stage fans with a single-stage fan of larger diameter. Noise Exposure Forecast (NEF) contours were computed for the baseline (nonretrofitted) aircraft for the projected traffic volume and fleet mix for the year 1990. These NEF contours are presented along with contours for a variety of retrofit options. Comparisons of the baseline with the noise reduction options are given in terms of total land area exposed to 30 and 40 NEF levels. Results are also presented of the effects on noise exposure area of the total number of daily operations.
Document ID
19740012547
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Cawthorn, J. M. (NASA Langley Research Center Hampton, VA, United States)
Brown, C. G. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
February 19, 1974
Subject Category
Aircraft
Report/Patent Number
NASA-TM-X-71953
Accession Number
74N20660
Funding Number(s)
PROJECT: RTOP 501-24-01-06
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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