Measured Noise Reductions Resulting from Modified Approach Procedures for Business Jet Aircraft
Burcham Jr., Frank W. and Putnam, Terrill W. and Lasagna, Paul L. and Parish, O. Owen (1975) Measured Noise Reductions Resulting from Modified Approach Procedures for Business Jet Aircraft. Technical Report NASA TM X-56037, Research Engineering, NASA Dryden Flight Research Center.
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Abstract
Five business jet airplanes were flown to determine the noise reductions that result from the use of modified approach procedures. The airplanes tested were a Gulfstream II, JetStar, Hawker Siddeley 125-400, Sabreliner-60 and LearJet-24. Noise measurements were made 3,5, and 7 nautical miles from the touchdown point. In addition to a standard 3 degree glide slope approach, a 4 degree glide slope approach, a 3 degree glide slope approach in a low-drag configuration, and a two-segment approach were flown. It was found that the 4 degree approach was about 4 EPNdB quieter than the standard 3 degree approach. Noise reductions for the low-drag 3 degree approach varied widely among the airplanes tested, with an average of 8.5 EPNdB on a fleet-weighted basis. The two-segment approach resulted in noise reductions of 7 to 8 EPNdB at 3 and 5 nautical miles from touchdown, but only 3 EPNdB at 7 nautical miles from touchdown when the airplanes were still in level flight prior to glide slope intercept. Pilot ratings showed progressively increasing workload for the 4 degree, low-drag 3 degree, and two-segment approaches.
| EPrint Type: | NASA Technical Memorandum |
|---|---|
| Keywords: | Approach noise, Business jets, Gulfstream II airplane, Hawker Siddeley 125-400 airplane, Sabreliner-60 airplane, LearJet-24 airplane |
| Subjects: | Not Categorized Aircraft/Project: C-140 JetStar |
| ID Code: | 735 |
| Deposited On: | 15 Febuary 2006 |
| Additional Information: | 31 pages. |
