Systems and methods for performing excessive negative pitch alert and for biasing a sink rate alert

摘要

Systems and methods that alert the pilot of the unusual negative pitch attitude. Additionally, the system can bias a “sink rate” envelope toward a more sensitive direction, such that the pilot can be alerted while (or before) a large sink rate is built up during an unusual negative pitch attitude condition.

主权项

1. A system located on an aircraft, the system comprising:
a processing device configured to:
receive a current pitch angle value, and a current aircraft altitude;set a pitch angle threshold value based on the current aircraft altitude;generate a first alert if the received pitch angle value is more negative than the pitch angle threshold value;adjust a sink rate alert envelope if the received pitch angle value is more negative than the pitch angle threshold value;receive a sink rate value; andgenerate a second alert if sink rate is within the sink rate alert envelope an output device configured to output the generated alerts, wherein the pitch angle threshold value is set to:
a first value when the current altitude is below a first altitude,a second value when the current altitude is above a second altitude, anda value that varies linearly between the first value and the second value when the current altitude is between the first altitude and the second altitude, andwherein the second value is greater in magnitude than the first value, and the second altitude is greater than the first altitude.