The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 2011
Filed:
Oct. 17, 2008
Alan D. Marx, Shoreline, WA (US);
Gary A. Emch, Arlington, WA (US);
Mark J. Gardner, Snohomish, WA (US);
Richard I. Apfel, Seattle, WA (US);
Michael E. Renzelmann, Woodinville, WA (US);
Christopher D. Feet, Marysville, WA (US);
Michael R. Finn, Kirkland, WA (US);
Mark S. Good, Seattle, WA (US);
Gregory J. Seehusen, Seattle, WA (US);
Alan D. Marx, Shoreline, WA (US);
Gary A. Emch, Arlington, WA (US);
Mark J. Gardner, Snohomish, WA (US);
Richard I. Apfel, Seattle, WA (US);
Michael E. Renzelmann, Woodinville, WA (US);
Christopher D. Feet, Marysville, WA (US);
Michael R. Finn, Kirkland, WA (US);
Mark S. Good, Seattle, WA (US);
Gregory J. Seehusen, Seattle, WA (US);
The Boeing Company, Chicago, IL (US);
Abstract
A method for detecting freewheeling skew failures in the wing flaps of an aircraft includes measuring the outputs of flap skew sensors when the aircraft is in flight (IF) and the flaps are extended to a selected position, and when the aircraft is next on the ground (OG) and the flaps are extended to the selected position. The respective differences between the IF and OG outputs of symmetrical pairs of the flap skew sensors are computed, and then the respective difference between the computed IF output difference and the computed OG output difference of each symmetrical pair of the sensors is computed. The computed IF and OG difference of each symmetrical pair of the sensors is then compared with each of predetermined maximum and minimum threshold value to determine whether a freewheeling skew failure exists in any of the flaps of the aircraft.