METHOD AND A DEVICE FOR ISSUING TERRAIN AVOIDANCE WARNINGS FOR A ROTARY WING AIRCRAFT

摘要

A method and a device (50) for issuing a terrain avoidance warning for a rotary wing aircraft (100) during which at least one bundle (N1, N2) of possible avoidance trajectories for said aircraft (100) is prepared in order to avoid a collision between said aircraft (100) and the relief (70) being overflown. A warning is then triggered as soon as said relief (70) being overflown is found to be at a distance from any one of said bundles (N1, N2) of possible avoidance trajectories that is less than a predetermined distance (Mv). Said avoidance trajectories are determined on the basis of a predetermined avoidance maneuver and on the basis of states of said aircraft (100), said predetermined avoidance maneuver being performed at a predetermined maximum power of said aircraft (100).

主权项

1. A method of issuing a terrain avoidance warning by a rotary wing aircraft, the method comprising the following steps performed repetitively:
preparing at least one bundle of possible avoidance trajectories for the aircraft in order to avoid said aircraft colliding with relief being overflown by said aircraft or with an obstacle if any; and triggering a warning if any one of said bundles of possible avoidance trajectories leads to a distance from said relief being overflown or from said obstacle if any that is less than a predetermined distance: wherein said possible avoidance trajectories are determined on the basis of a predetermined avoidance maneuver and on the basis of current states of said aircraft, said avoidance maneuver comprising: a deceleration stage of deceleration down to a predetermined forward speed Vafinal, said deceleration stage being obtained by said aircraft taking up a predetermined nose-up attitude and being performed at a predetermined maximum power of said aircraft; and a final stage of said aircraft climbing, during which the forward speed of said aircraft is kept equal to said predetermined forward speed Vafinal and the power from the engines is kept equal to said maximum predetermined power.