Abstract: Methods and apparatus for detecting surface deformation of aircraft surfaces are disclosed. An example apparatus includes a sensor system to monitor an aircraft surface, the sensor system including a first sensor and a second sensor. A surface monitoring system receives signals from the first sensor and the second sensor and based on the signals received, the surface monitoring system is to: detect a surface deformation on the aircraft surface; analyze one or more environmental conditions or aircraft parameters; and classify a severity of a detected surface deformation based on the one or more environmental conditions or aircraft parameters to determine if the detected surface deformation impacts aircraft performance or safety.