A method for monitoring the health of a plurality of blades, comprising: determining delta times of arrival "TOAs" corresponding to the plurality of blades, each delta TOA being the difference between an actual time of arrival and an expected time of arrival of each of the plurality of blades; characterized by the steps of: determining a standard deviation utilizing the delta TOAs corresponding to the plurality of blades; determining a delta sigma_1, delta sigma_1 being the difference between the current standard deviation and an initial standard deviation; determining a normalized delta TOA corresponding to one or more of the plurality of blades utilizing the delta sigma_1, wherein determining the normalized delta TOA comprises determining the normalized delta TOA utilizing the following equation: Norm _ Δ ⁢ TO A k t = Δ ⁢ TO A k t − K ∗ Δ σ t _ 1 − Mean Δ TO A 1 ⁢ toj t where Norm_ Δ TOA k ( t) is a normalized delta TOA corresponding to a blade k at a t instant of time, Δ TOA k ( t) is a delta TOA corresponding to the blade k at the t instant of time, Δ σ ( t)_1 is a delta sigma_1 at the t instant of time, K is a constant, and Mean (Δ TOA 1 toj ( t) is a mean of the delta TOAs corresponding to the plurality of blades; determining a standard deviation of the normalized delta TOA; determining a delta sigma_2, delta sigma_2 being the difference between the current standard deviation of the normalized delta TOA and a previous standard deviation of normalized delta TOA; and determining a corrected delta TOA corresponding to the one or more of the plurality of blades based upon the delta sigma_2. determining a standard deviation utilizing the delta TOAs corresponding to the plurality of blades; determining a delta sigma_1, delta sigma_1 being the difference between the current standard deviation and an initial standard deviation; determining a normalized delta TOA corresponding to one or more of the plurality of blades utilizing the delta sigma_1, wherein determining the normalized delta TOA comprises determining the normalized delta TOA utilizing the following equation: Norm _ Δ ⁢ TO A k t = Δ ⁢ TO A k t − K ∗ Δ σ t _ 1 − Mean Δ TO A 1 ⁢ toj t where Norm_ Δ TOA k ( t) is a normalized delta TOA corresponding to a blade k at a t instant of time, Δ TOA k ( t) is a delta TOA corresponding to the blade k at the t instant of time, Δ σ ( t)_1 is a delta sigma_1 at the t instant of time, K is a constant, and Mean (Δ TOA 1 toj ( t) is a mean of the delta TOAs corresponding to the plurality of blades; determining a standard deviation of the normalized delta TOA; determining a delta sigma_2, delta sigma_2 being the difference between the current standard deviation of the normalized delta TOA and a previous standard deviation of normalized delta TOA; and determining a corrected delta TOA corresponding to the one or more of the plurality of blades based upon the delta sigma_2. where Norm_ Δ TOA k ( t) is a normalized delta TOA corresponding to a blade k at a t instant of time, Δ TOA k ( t) is a delta TOA corresponding to the blade k at the t instant of time, Δ σ ( t)_1 is a delta sigma_1 at the t instant of time, K is a constant, and Mean (Δ TOA 1 toj ( t) is a mean of the delta TOAs corresponding to the plurality of blades; determining a standard deviation of the normalized delta TOA; determining a delta sigma_2, delta sigma_2 being the difference between the current standard deviation of the normalized delta TOA and a previous standard deviation of normalized delta TOA; and determining a corrected delta TOA corresponding to the one or more of the plurality of blades based upon the delta sigma_2.