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:
Dec. 17, 1996
Filed:
Apr. 24, 1995
Noel S Paterson, Woodinville, WA (US);
Scott R Gremmert, Duvall, WA (US);
Gary A Ostrom, Bellevue, WA (US);
AlliedSignal, Inc., Morristown, NJ (US);
Abstract
A warning system for aircraft equipped with an autopilot system having a radio altitude hold (R/A HOLD) function and/or a barometric altitude hold (ALTITUDE HOLD) function monitors the R/A HOLD and ALTITUDE HOLD function control switches, as well as the touch-controlled steering (TCS) control to determine when the functions have been engaged. When either of the R/A HOLD or ALTITUDE HOLD function control switches are selected while the autopilot system is engaged, the system samples the radio altitude or barometric altitude at the moment that the R/A HOLD or ALTITUDE HOLD functions are selected and stores the sample as a reference or datum. The system then compares the current radio altitude or barometric altitude with the datum. Should the actual radio altitude or barometric altitude exceed the datum by a predetermined amount, a warning is generated. In order to prevent spurious warnings, the system is disabled when the touch-control steering is active.