System for reducing aircraft noise and hush kit

Details System for reducing aircraft noise and hush kit System for reducing aircraft noise and hush kit

1987-05-29

1989-06-06

Barefoot, Galen

Aeronautics and astronautics

Miscellaneous

181213, 181220, 181222, 181296, B64D 2900, B64D 3304

Patent

active

048364690

ABSTRACT:
A system is provided for existing three-engine jet aircraft to reduce the noise levels at take-off and landing in order to meet governmental noise regulations. The system is particularly suitable for 727-200 aircraft having three JT8D engines. A hush kit is formed of the modified components for installation in existing airplanes.

REFERENCES:
patent: 3002341 (1961-10-01), Muzzy et al.
patent: 3237891 (1966-03-01), Wotton
patent: 4379191 (1983-04-01), Beggs et al.
patent: 4456204 (1984-06-01), Hapke
patent: 4723626 (1988-02-01), Carr et al.
"Silencing an Executive Jet Aircraft", Noise Control Engineering, vol. 5, No. 2, Sep.-Oct. 1975, J. R. Brooks, et al.
"Quieting the JT3D Powered 707", Sound and Vibration, vol 8, No. 2, Feb. 1974, J. Woodall.

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