727 NOISE RETROFIT FEASIBILITY. VOLUME III. UPPER GOAL FLIGHT TESTING AND PROGRAM SUMMARY

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)

• Supplemental Notes:
  • See also Volume 2, AD-763 596.
• Corporate Authors:

  Boeing Company

  Commercial Airplane Division, P.O. Box 3707
  Seattle, WA  United States  98124
• Authors:
  • Hiatt, D L
  • McKaig, M B
• Publication Date: 1973-6

Media Info

• Pagination: 227 p.

Subject/Index Terms

• TRT Terms: Acoustic impedance; Acoustic materials; Aircraft noise; Civil aircraft; Costs; Damping (Engineering); Design; Flight tests; Honeycomb structures; Jet engines; Nacelles; Noise control; Nozzles; Sandwich construction; Turbojet engines
• Identifier Terms: Boeing 727 aircraft; U.S. Federal Aviation Administration
• Uncontrolled Terms: Aging aircraft; Noise reduction
• Old TRIS Terms: Acoustic panels; Commercial planes; Faa; Honeycomb cores; Jet engine nacelles; Jet engine noise; Jt-8 engines; Jt-8d engines; Noise suppressors
• Subject Areas: Aviation; Design; Finance; Vehicles and Equipment;

Filing Info

• Accession Number: 00051490
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: D6-60196 Final Rpt
• Contract Numbers: DOT-FA71WA-2637
• Files: NTIS
• Created Date: Feb 28 1974 12:00AM