Wind Shear Hazard Definition for a Wide Body Jet.
Abstract
An approach to defining the hazards to a wide body jet caused by low level wind shear is presented. Hazard envelopes are used to define the limitations of aircraft with specific configurations and gross weights, proceeding within aircraft capabilities through wind shear conditions. A computer program is developed to simulate the flight dynamics and automatic flight control system (AFCS) of a three engine jumbo jet following a 3 deg. glideslope during final approach. Wind shear profiles representative of actual encounters are used. The simulation uses both autopilot and autothrottle. Analyses presented herein represent an initial effort to define specific wind shear conditions that pose hazards to aircraft. Parameter values are analyzed for each of four categorized wind shear environments and performance scores achieved on computer simulations are assigned for each of the four wind shear types. The most severe situations that can be accommodated by a jumbo tri-jet with current configuration are described for each of the four wind shear types. Conservative controlability criteria is applied and a hazardous condition is presumed to exist when the control action demanded and provided by the simulator exceeds the control limits of the actual aircraft, or when the airspeed and/or touchdown dispersion exceed limit values. Definition of these criteria provide a basis for the formulation of procedures allowing aircraft to anticipate and avoid hazardous wind shear conditions. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1979
- Accession Number
- ADA079315
Entities
People
- Herbert W. Schlickenmaier
Organizations
- Federal Aviation Administration