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US 4,908,619 AGranted
Aircraft stall warning system
AssigneeThe Boeing Company
InventorsPaul F. Bala, Edgars A. Kupcis, William B. Fisher
Life of this patent
Estimating the term…
Abstract
A stall warning "stick shaker" reference level signal is produced as a function of both flap position and total aircraft thrust. More specifically, a correction term .DELTA..alpha. is combined with a standard stick shaker reference level signal which is scheduled as a function of aircraft flap position. The .DELTA..alpha. signal is scheduled as a function of the total aircraft gross thrust coefficient. The resultant reference level signal produces advance stall warnings that are essentially invariant with engine power level.
Claims9
Apparatus for producing an aircraft stall warning signal comprising:
- a means for producing a signal a representative of aircraft angle of attack;
- .DELTA..alpha. means for producing a signal .DELTA..alpha. which is predeterminedly related to engine thrust level;
- and
- comparator means for comparing said a and said .DELTA..alpha.signals and producing a stall warning signal in response to a predetermined relationship therebetween.
1 more element
Dependencies are inferred from the claim text.