Patent ID: 7561946

Claim:
A method for monitoring and analyzing, in real time, variation with time of an aircraft flight parameter, the method comprising: measuring a value FP(t=t p ) of a selected flight parameter FP for an aircraft, for a time, t=t p that is equal to or adjacent to a present time; providing a sequence {FP(t n ;ref)} n of FP reference values for at least two time values, t=t n (n=n1, n2), and an available recovery time interval length Δt(FP;rec); providing at least one constrained solution u(t;t n ) for the FP on a graph (t, u(t)), with at least one initial constrained solution value u(t=t n ;t n ) that is displaced from the corresponding value FP(t=t n ;ref); for each constrained solution u(t;t n ), providing a reference curve-crossing time value, t=t zc (n), at which u(t;t n ) crosses at least one trace of the reference values FP(t;ref) on the graph; computing a coordinate pair (t,u)=(t zc (n)−Δt(FP;rec),u(t zc (n)−Δt(FP;rec);t n )) on the graph for the at least two time values, t=t n (n=n1, n2), and identifying this coordinate pair with at least one point on a recovery band boundary trace; connecting at least two of the points with the coordinates (t zc (n)−Δt(FP;rec),u(t zc (n)−Δt(FP;rec);t n )) to provide a portion of a recovery band boundary trace; providing at least first and second non-coincident recovery band boundary traces, (t,FP(t;rec; 1 )) and (t;FP(t;rec; 2 )), that are spaced apart from each other for at least one time value t on the graph (t, u(t)); displaying the at least first and second recovery band boundary traces, (t,FP(t;rec; 1 )) and (t;FP(t;rec; 2 )), and the value FP(t=t p ) of the flight parameter at the time t=t p on the graph (t, u(t)); and providing an operator of the aircraft with information which may be used to bring the flight parameter FP within the recovery band defined by the first and second recovery band boundary traces.