56A Hazard Definition for Wake Turbulence Encounter During Terminal Area Operations

Details

• Creators:
  Harlan, Raymond B. ; Madden, Stephen J.
• Corporate Creators:
  Massachusetts Institute of Technology
• Corporate Contributors:
  Transportation Systems Center
• Subject/TRT Terms:
  • Wakes
  • Turbulence
  • Vortices
  • Hazard evaluation
  • Aircraft
  • Simulation
  • Computer models
  • Definitions
• Publication/ Report Number:
  MIT-MSL-RE-81
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final report
• Corporate Publisher:
  Transportation Systems Center
• NTL Classification:
  NTL-AVIATION-Aviation Safety/Airworthiness
• Abstract:
  A six-degree-of-freedom vortex encounter simulation has been developed for use on a hybrid computer to determine the hazard potential for terminal area operations. Complete trajectory data for landing, horizontal flyby, and climbing flights are presented and conclusions .are drawn from these results. A hazardous condition is defined as having the roll angle exceed ten degrees and/or the flight path angle become steeper than -4 1/2 degrees at any·point along the flight path with the aircraft under autopilot control. For the two trailing aircraft which were simulated (DC-9 Series 10 and KC-135), the minimum safe separation from a single vortex, 100 feet above the ground, ranges from 75 to 130 feet for vortices with a strength of 5000 ft per sec. A simplified sensitivity analysis shows that the controllability of an aircraft is about·twice as sensitive to changes in vortex proximity than to changes in wingspan, but if the near wingtip proximity is chosen to be the independent variable, controllability is nearly independent of aircraft size. These results are substantiated by the computer simulation.
• Format:
  PDF
• Funding:
  DOT-TSC-166
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/37392/dot_37392_DS1.pdf
• File Type:
  [PDF - 9.12 MB]
• Collection(s):
  Volpe Center
• Main Document Checksum:
  urn:sha256:7e925702d1d7428e3559f83c51b8b5ed04f0fcdef8220f6a8e1847e7b2425875