Accession Number:

AD0768850

Title:

727 Noise Retrofit Feasibility. Volume III. Upper Goal Flight Testing and Program Summary.

Descriptive Note:

Final rept. Jul 71-Dec 72,

Corporate Author:

BOEING COMMERCIAL AIRPLANE CO SEATTLE WASH

Personal Author(s):

Report Date:

1973-06-01

Pagination or Media Count:

227.0

Abstract:

The work consisted of flight testing of the quiet-nacelle configuration developed in phase 2 in fulfillment of the FAA upper noise reduction goals for the 727 airplane, along with parallel flight testing of the 727 production nacelle as a baseline. All testing was performed on a model 727-100 airplane, with results extrapolated to the long-body 200 model. The phase 2 nacelles consist of peripheral acoustic lining in all inlets plus double-ring acoustic treatment in the side-engine inlets acoustically treated engine fan ducts and multilobe variable-geometry jet noise suppressors discharging through fixed, acoustically lined ejectors, with provision for automatic closure of the ejector inlets for cruise operation. Acoustic propulsion, and aerodynamic performance analyses were made, along with a study of the physical effects of integrating the phase 2 nacelle on both model 727s. A direct-operating-cost DOC analysis was prepared based on realistic retrofit installation cost estimates and airplane performance analyses. In addition, a study was made of engine and airframe options available for recovery of performance penalties incurred by installation of phase 2 nacelles. Author

Subject Categories:

  • Civilian Aircraft
  • Acoustics
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE