Accession Number : ADA327125

Title :   Wake Vortex Separation Standards: Analysis Methods.

Descriptive Note : Final rept. Jan-Mar 97,

Corporate Author : JOHN A VOLPE NATIONAL TRANSPORTATION SYSTEMS CENTER CAMBRIDGE MA

Personal Author(s) : Burnham, David ; Hallock, James

PDF Url : ADA327125

Report Date : MAY 1997

Pagination or Media Count : 90

Abstract : Wake vortex separation standards are used to prevent hazardous wake vortex encounters. A 'safe' separation model can be used to assess the safety of proposed changes in the standards. A safe separation model can be derived from an encounter hazard model and a vortex decay model. This report presents subsequent developments and applications of such a model which was first developed in the early 1980s. A static encounter hazard model is coupled with a decay model based on sodar measurements of vortex decay. The separation standards and procedures used from 1976 to 1994 are assumed to be safe based on the absence of IFR accidents. Various versions of the model are used to assess how aircraft should be classified and to evaluate the safety of a possible four-class aircraft separation system. Recommendations are made for ways of improving the safe separation models.

Descriptors :   *VORTICES, AIRCRAFT, MODELS, SAFETY, WAKE, STANDARDS, SEPARATION.

Subject Categories : Terminal Flight Facilities
      Logistics, Military Facilities and Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE