Besides using the Skiddometer during rain, slush, and snow conditions (operational use), the Skiddometer is also used for checking the runway surface condition and “rubber build-ups” (Runway Calibration), i.e. measuring wet friction at a water depth of 1 mm. This measurement is based on recommendations of the International Civil Aviation Organization (ICAO), the Federal Aviation Administration (FAA), and ASTM standard E 1960 – 98. Since wet pavement always yields the lowest friction measurements, Skiddometer BV11 should routinely be used on wet pavement which gives the “worst case” condition.
Skiddometer equipped with a self-wetting system simulates rain wet pavement surface conditions and provides the operator with a continuous record of friction values along the length of the runway. The attached water pump and nozzle is designed to provide a uniform water depth of 1 mm (0.04 inches) in front of the friction measuring tire. This wetted surface produces friction values that are most meaningful in determining whether or not corrective action is required.
For Runway Calibration Moventor offers two different types of self-wetting systems: Water On Board and WMS.