Aircraft takeoff

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EP1 616 788A3

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(88)Date of publication A3:

EUROPEAN PATENT APPLICATION

(51)Int Cl.:BD45/00(2006.01)F02C9/00(2006.01)BD31/00(2006.01)14.01.2009Bulletin2009/03

(43)Date of publication A2:

18.01.2006Bulletin2006/03

(21)Application number: 052537.1(22)Date of filing: 14.06.2005(84)Designated Contracting States:

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TRDesignated Extension States: AL BA HR LV MK YU

(72)Inventor: Brown, Stephen Geoffrey

Breadsall, Derby DE21 5LF (GB)(74)Representative: Gunn, Michael Alan

Rolls-Royce plc P.O. Box 31

Derby DE24 8BJ (GB)(30)Priority:13.07.2004GB 0415618(71)Applicant: ROLLS-ROYCE PLC

London, SW1E 6AT (GB)()(57)

Aircraft takeoff

is provided. The present method may also be used incooperation with existing takeoff determining systemsutilising engine thrust as the means of determining air-craft capability to takeoff. The authority of the variousaircraft takeoff criteria can be adjusted as required. Fur-thermore, the present aircraft acceleration regime maybe utilised with regard to adjusting existing engine thrustmeans for determining takeoff or cruise capability.

The present invention provides a method of op-erating an aircraft whereby actual acceleration of an air-craft is used as the direct measure of the capability ofthe aircraft to takeoff. Thus, a minimum takeoff acceler-ation is determined for an aircraft and then through ap-propriate sensing means for acceleration, actual accel-eration of the aircraft is determined and compared withthat predetermined minimum takeoff acceleration. If theactual aircraft acceleration exceeds the minimum takeoffacceleration then an indication such as a buzzer or signal

EP1 616 788A3Printed by Jouve, 75001 PARIS (FR)

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