1. Low Frequency Airplane Noise Measurement
Xiao Di, Claus H. Hetzer, Ronald A. Wagstaff,
and Kenneth E. Gilbert
National Center for Physical Acoustics
University of Mississippi, University, MS 38677
November 3, 2008
Work Supported By The U.S. Army TACOM-ARDEC at Picatinny Arsenal, New Jersey

2. Experiment Site: Memphis Airport
April - July, 2007

3. Fedex Plane Preparing Landing (video)

4. Fedex Plane Landing at 11 Am

5. Fedex Plane Overhead & Landing at 1 PM

11. Summary Airplane landing generated infrasound sound detected
(60 dB-70 dB) at distance of 2 to 3 miles (over 75 occasions)
Mechanism? Wingtip vortices
Reverse Thrust
Flaps and Spoilers
More Experiments Are Planned

12. QUESTIONS ?