System and method for improved low airspeed warning

摘要

A method and system are provided for generating a low airspeed warning in an aircraft. This method creates a scale factor that is a factor of engine thrust and aircraft altitude. A low airspeed threshold is determined that varies according to the aircraft altitude with respect to a predetermined altitude band and the engine thrust with respect to a predetermined engine thrust band. A low airspeed alert is generated in response to the determination of the low airspeed threshold. This method provides a pilot with earlier knowledge of low airspeed conditions when the aircraft is in a target altitude band, increasing the pilot's response time and thereby enhancing overall aircraft safety.

主权项

1. A method for generating a low airspeed warning in an aircraft, the method comprising:
receiving engine thrust data; receiving aircraft altitude data; determining, in a processor, when the aircraft altitude is within a predetermined altitude band; and, when the aircraft altitude is within the predetermined altitude band, (i) determining, by the processor, a low airspeed threshold that is a function of engine thrust, and (ii) generating a low airspeed alert indicative of the low airspeed threshold, wherein generating a low airspeed alert comprises receiving, in the processor, a stick shaker speed; receiving, in the processor, a minimum operating speed; and determining, by the processor, when engine thrust is below a predetermined minimum thrust; and when engine thrust is below the predetermined minimum thrust, modifying a combination of the minimum operating speed and the stick shaker speed by a first scale factor equal to a first predetermined value.