Modified thrust limit schedule for control of thrust asymmetry

Abstract

A flight control and engine control function for a multi-engine aircraft which automatically controls maximum thrust on the operating engine to a value lower than the nominal thrust limit schedule in the event of loss of thrust on another engine. The maximum engine thrust of the operating engine is controlled (limited) such that the resulting thrust asymmetry can be controlled at airspeeds lower than would otherwise be the case. The decrease in engine-out minimum control speed can reduce the limitation on landing speeds that would otherwise be caused by engine-out minimum control speed.

Description

technical field [0001] The present invention generally relates to improving automatic control of multi-engine aircraft experiencing engine thrust asymmetry. Background technique [0002] Large aircraft have a wide range of operating loads. The engine is sized to achieve the desired performance under heavier loads. This allows the aircraft to have much more power at light operating loads than is required to achieve the desired performance at that load. [0003] The landing speed is set to be greater than the wing lift limiting speed or the engine output minimum control speed. The lift limiting speed is required to be at least 23% greater than the stall speed and is therefore a direct function of the aircraft weight. A large aircraft with very little payload and fuel can land at a much lower speed than the same aircraft with a larger payload. The engine output minimum control speed is determined to be the airspeed at which engine failure can be controlled with full thrust ...

AI Technical Summary

Problems solved by technology

[0007] The disadvantage of increasing the vertical tail and rudder is the greater load and drag

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