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Simulation study to evaluate a constant-groundspeed approach method in moderate and severe wind shearsThe use of a constant-groundspeed procedure for flying final approaches in moderate and severe wind shear environments was investigated. Performance was compared to results of simulated constant-airspeed approaches in identical wind profiles. The simulation model was a medium twin-jet transport equipped with an autothrottle for maintaining constant groundspeed or constant airspeed. For both moderate and severe wind shears, the constant-groundspeed approach method was shown to provide a way to more safely negotiate the shears while also providing predictable and acceptable touchdown performance. Results showed airspeeds on final approach to be considerably higher using the constant-groundspeed method, which supplied the additional stall margin needed when tail-wind shears were encountered. Throttle movements were noticeably reduced in all wind profiles when constant-groundspeed approaches were flown. Touchdown conditions were practically identical for both approach methods in moderate wind shear.
Document ID
19790011918
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Kelley, W. W. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
March 1, 1979
Subject Category
Air Transportation And Safety
Report/Patent Number
NASA-TM-80060
Accession Number
79N20089
Funding Number(s)
PROJECT: RTOP 513-52-13-52
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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