This paper presents the results of a large empirical trial of the likely costs and benefits of different large aircraft departure procedures, under normal operational conditions, at London Heathrow Airport. The current B747 departures procedure (designated C in these trials), adopted by British Airways at Heathrow, has been adapted from the ICAO B procedure to maximise aerodynamic efficiency independent of noise considerations. After consultation with the Boeing Airplane Company, British Airways selected two alternative departure procedures (designated A and B) to compare with procedure C. It aimed to investigate the potential for reducing noise levels at increasing distances from the start of roll position on the ground. Noise monitors were placed at distances of about 4.6, 6.7, 10,5, and 12.3km from the airport, and noise measurements were taken for a sample of 478 aircraft departures, for aircraft of types 747-100, 747-200, and 747-400. For each procedure and aircraft type, the paper tabulates the mean Lamax noise levels at the monitors. The standard deviations varied from about 1 to 2dB for the B747-400 and about 1 to 3dB for the other aircraft. Procedure A (early engine cutback) was found statistically significantly better, at the 6.7km position only. For the covering abstract, see IRRD E100715.


  • English

Media Info

  • Pagination: p. 127-34

Subject/Index Terms

Filing Info

  • Accession Number: 00764412
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 1-901656-09-8
  • Files: ITRD
  • Created Date: May 28 1999 12:00AM