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OCR for page 91
Appendix A Win~l-Shear PlREPs The following is an excerpt from the FAA's Airman's Information Manual, Chapter 6, Section 1, METEOROLOGY, Paragraph 523, Wind-Shear PIREPS. b. EXAMPLE: Because unexpected changes in wind speed and direction can be hazardous to aircraft operations at low altitudes on approach to and departing from airports, pilots are urged to volunteer reports to controllers of wind shear conditions they encounter. An advance warning of this information will assist other pilots in avoiding or coping with a wind shear on approach or departure. When describing conditions, use of the terms "negative" or "positive" wind shear should be avoided. PIREPS of "negative wind shear on final," intended to describe loss of airspeed and lift, have been interpreted to mean that no wind shear was encountered. The recommended method for wind shear reporting is to state the loss or gain of airspeed and the altitudes at which it was encountered. DENVER TOWER, CESSNA 1234 ENCOUNTERED WIND SHEAR, LOSS of 20 KNOTS AT 400 FEET. EXAMPLE: TULSA TOWER, AMERICAN 721 ENCOUNTERED WIND SHEAR ON FINAL, GAINED 25 KNOTS BETWEEN 600 AND 400 FEET FOLLOWED BY LOSS OF 40 KNOTS BETWEEN 400 FEET AND SURFACE. (1) Pilots who are not able to report wind shear in these specific terms are encouraged to make report in tens of the effect upon their aircraft. EXAMPLE: MIAMI TOWER, GULFSTREAM 403 CHARLIE ENCOUNTERED AN ABRUPT WIND SHEAR AT 800 FEET ON FINAL, MAX THRUST REQUIRED. (2) Pilots using Inertial Navigation Systems should report the wind and altitude both above and below the shear level. 91
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