Patent ID: 9441655
Filing Date: 2016-09-13
CPC Classification: B21J,B64C,F16B,Y10T

Claim Text:
1. An alarm method for avoiding inappropriate actuation a rudder bar of an aircraft by a pilot, said rudder bar configured to be moved in two opposite directions by the pilot to control a rudder, said rudder being able to turn in two directions of rotation up to a maximum rotation position in each of the two directions of rotation, one of the two opposite directions of the rudder bar being associated with one of the directions of rotation of the rudder and the other direction of the rudder bar being associated with the other direction of rotation of the rudder, comprising the steps: monitoring a current rudder bar position value of the rudder bar to detect when the rudder bar reaches an extreme position, that is, when the rudder reaches one of its maximum rotation positions; detecting that the rudder bar reaches the extreme position; determining whether, within a predetermined time period after the detection of reaching the extreme position, the following alarm activation conditions are met: verifying the current position of the rudder in relation to the neutral position; setting a predetermined limit on a neutral position value for detection of the neutral position; comparing the current rudder bar position value of the rudder bar to the neutral position value which corresponds to a fraction of a position value representative of the maximum rotation position of the rudder; and triggering an alarm when said alarm activation conditions are met during said predetermined time period based on the comparison of the current rudder bar position value and the neutral position value.