A method comprising: receiving sensor data indicative of a current loading condition of a blade (20, 23, 26) of a rotating wind turbine rotor, wherein the blade is coupled to a hub of the wind turbine rotor by a conventional pitch actuator and includes a plurality of air deflector units (31, 34, 37), each of the air deflector units includes a deflector element extendable into and retractable from air flow over the blade, and the plurality of air deflector units has a current deployment configuration, and the blade includes a sensor array and the sensor data comprises sensor data values (S4 - S4(j)) received from the sensor array; obtaining an array of error values (E41 - E41(j)) by subtracting an array of threshold scalars (μ4 - μ4(j)) from a corresponding set of location adjusted sensor data values (S4 L - S4 L (j)), each of the set of location adjusted sensor data values comprising a value based at least in part on a different one of the sensor data values (S4 - S4(j)); characterized by summing density-adjusted error values (E41 D - E41 D (j)) based at least in part on the array of error values to obtain a summed error value (E41s); summing a set of density-adjusted sensor values (S4 D - S4 D (j)) based at least in part on the sensor data values (S4 - S4(j)) to obtain a summed error signal value (S4s); receiving a value (β4) for the current pitch of the blade; determining whether the summed error signal value (S4s) is further processed, utilizing a filtered β4 value (β4 F) based at least in part on the value (β4) for the current pitch of the blade; subtracting a threshold scalar from a filtered signal value (S4 F) based at least in part on the summed error signal value (S4s), and obtaining an error value; determining a first deployment configuration (Δh A - Δh A (k)) for the air deflector units based at least in part on the summed error value (E41s), determining a second deployment configuration (Δh B - Δh B (k)) for the air deflector units based at least in part on the summed error signal value (S4s), and determining a combined deployment configuration (Δh COMB - Δh COMB (k)) for the air deflector units based on the first deployment configuration and the second deployment configuration; generating actuator command signals to at least one of the air deflector units to implement the combined deployment configuration; and transmitting the actuator command signals. receiving sensor data indicative of a current loading condition of a blade (20, 23, 26) of a rotating wind turbine rotor, wherein the blade is coupled to a hub of the wind turbine rotor by a conventional pitch actuator and includes a plurality of air deflector units (31, 34, 37), each of the air deflector units includes a deflector element extendable into and retractable from air flow over the blade, and the plurality of air deflector units has a current deployment configuration, and the blade includes a sensor array and the sensor data comprises sensor data values (S4 - S4(j)) received from the sensor array; the blade is coupled to a hub of the wind turbine rotor by a conventional pitch actuator and includes a plurality of air deflector units (31, 34, 37), each of the air deflector units includes a deflector element extendable into and retractable from air flow over the blade, and the plurality of air deflector units has a current deployment configuration, and the blade includes a sensor array and the sensor data comprises sensor data values (S4 - S4(j)) received from the sensor array; obtaining an array of error values (E41 - E41(j)) by subtracting an array of threshold scalars (μ4 - μ4(j)) from a corresponding set of location adjusted sensor data values (S4 L - S4 L (j)), each of the set of location adjusted sensor data values comprising a value based at least in part on a different one of the sensor data values (S4 - S4(j)); characterized by summing density-adjusted error values (E41 D - E41 D (j)) based at least in part on the array of error values to obtain a summed error value (E41s); summing a set of density-adjusted sensor values (S4 D - S4 D (j)) based at least in part on the sensor data values (S4 - S4(j)) to obtain a summed error signal value (S4s); receiving a value (β4) for the current pitch of the blade; determining whether the summed error signal value (S4s) is further processed, utilizing a filtered β4 value (β4 F) based at least in part on the value (β4) for the current pitch of the blade; subtracting a threshold scalar from a filtered signal value (S4 F) based at least in part on the summed error signal value (S4s), and obtaining an error value; determining a first deployment configuration (Δh A - Δh A (k)) for the air deflector units based at least in part on the summed error value (E41s), determining a second deployment configuration (Δh B - Δh B (k)) for the air deflector units based at least in part on the summed error signal value (S4s), and determining a combined deployment configuration (Δh COMB - Δh COMB (k)) for the air deflector units based on the first deployment configuration and the second deployment configuration; generating actuator command signals to at least one of the air deflector units to implement the combined deployment configuration; and transmitting the actuator command signals.