NAC-Dynamic Friction Decelerometer (NAC-DFD®) is an electronic friction testing device for airport runways. This 3-axis mobile Android™ application can be used to “spot-check” a contaminated surface during winter runway operations. The application records vehicle braking values by measuring the “g” force, or lock-wheel braking action, when the vehicle operator completes a qualified test. This easy-to-use solution, when used with a vehicle mounting device, automatically creates the final repor