Wind shear on the approach: An investigation on the infuence of a tower measured wind environment on the symmetric motions of a simulated aircraft in an automatic approach

Wind shear on the approach: An investigation on the infuence of a tower measured wind environment on the symmetric motions of a simulated aircraft in an automatic approach

Schuring, J.

National Aerospace Laboratory NLR

1977-09-22

Measured wind profiles from the Royal Netherlands Meteorological Institute 200 m meteorological tower at Cabauw have been used to estimate wind shear effects on the symmetric motions of an approaching aircraft. Wind profiles as well as an automatically approaching DC-9 aircraft have been simulated on an electronic analog computer. The study shows, that requirements for autopilots etc. specifying only mean shear values, like the 8 kn/100 ft concept (FAA), are not adequate. Simulation results and measured wind data from the year 1973 have been combined to obtain statistical information on the change of exceeding a certain deviation from the glide path during an approach. The results indicate that relatively large deviations of the aircraft are related to nightly stable meteorological conditions, with low wind - speeds at 10 m height, in particular from the east or south. The largest deviations produced by the Cabauw wind profiles from 1973 did not exceed the coverage of a normal I.L.S. glide path indicator. Severe storms did not present hazardous situations in terms of vertical wind shear.

wind shear
wind profiles
wind measurement
aircraft landing
approach control
automatic landing control
glide paths
statistical distributions
statistical analysis
histograms
computerized simulation
DC-9 aircraft

http://resolver.tudelft.nl/uuid:d582b156-3b9e-45cd-a677-ef2aaac68c03

Nationaal Lucht- en Ruimtevaartlaboratorium

Campus only

NLR-TR 77078 U

Aerospace Engineering Reports

report

(c) 1977 National Aerospace Laboratory NLR