An apparatus comprising: a sensor system to monitor an aircraft surface, the sensor system including a first sensor and a second sensor; a surface monitoring system comprising: - a first sensor data evaluator configured to compare a first reference model of the aircraft surface to a first current model of the aircraft surface provided by the first sensor to detect a surface deformation on the aircraft surface; - a second sensor data evaluator configured to compare a second reference model of the aircraft surface to a second current model of the aircraft surface provided by the second sensor to detect the surface deformation on the aircraft surface; - an obscurant determiner, configured to detect obscurant conditions surrounding the aircraft and affecting accuracy of the first sensor and/or the second sensor; - an alert detector, configured to receive signals from the first sensor data evaluator, the second sensor data evaluator and the obscurant determiner, wherein the alert detector is configured to generate a scaled value based on the detected surface deformation and one or more environmental conditions or aircraft parameters to classify the severity of the detected surface deformation to determine if the detected surface deformation impacts aircraft performance or safety, wherein the alert detector is further configured to ignore signals from the second sensor data evaluator when the obscurant conditions are greater than a threshold value, and the alert detector is configured to receive signals from the first sensor data evaluator and the second sensor data evaluator when the obscurant conditions are less than the threshold value. a sensor system to monitor an aircraft surface, the sensor system including a first sensor and a second sensor; a surface monitoring system comprising: - a first sensor data evaluator configured to compare a first reference model of the aircraft surface to a first current model of the aircraft surface provided by the first sensor to detect a surface deformation on the aircraft surface; - a second sensor data evaluator configured to compare a second reference model of the aircraft surface to a second current model of the aircraft surface provided by the second sensor to detect the surface deformation on the aircraft surface; - an obscurant determiner, configured to detect obscurant conditions surrounding the aircraft and affecting accuracy of the first sensor and/or the second sensor; - an alert detector, configured to receive signals from the first sensor data evaluator, the second sensor data evaluator and the obscurant determiner, wherein the alert detector is configured to generate a scaled value based on the detected surface deformation and one or more environmental conditions or aircraft parameters to classify the severity of the detected surface deformation to determine if the detected surface deformation impacts aircraft performance or safety, wherein the alert detector is further configured to ignore signals from the second sensor data evaluator when the obscurant conditions are greater than a threshold value, and the alert detector is configured to receive signals from the first sensor data evaluator and the second sensor data evaluator when the obscurant conditions are less than the threshold value. - a first sensor data evaluator configured to compare a first reference model of the aircraft surface to a first current model of the aircraft surface provided by the first sensor to detect a surface deformation on the aircraft surface; - a second sensor data evaluator configured to compare a second reference model of the aircraft surface to a second current model of the aircraft surface provided by the second sensor to detect the surface deformation on the aircraft surface; - an obscurant determiner, configured to detect obscurant conditions surrounding the aircraft and affecting accuracy of the first sensor and/or the second sensor; - an alert detector, configured to receive signals from the first sensor data evaluator, the second sensor data evaluator and the obscurant determiner, wherein the alert detector is configured to generate a scaled value based on the detected surface deformation and one or more environmental conditions or aircraft parameters to classify the severity of the detected surface deformation to determine if the detected surface deformation impacts aircraft performance or safety, wherein the alert detector is further configured to ignore signals from the second sensor data evaluator when the obscurant conditions are greater than a threshold value, and the alert detector is configured to receive signals from the first sensor data evaluator and the second sensor data evaluator when the obscurant conditions are less than the threshold value.