1. The Why and How of Runway Friction Testing by Delia Harverson Findlay Irvine Ltd. Midlothian, Scotlanddelia@findlayirvine.com and Thomas J. Yager NASA Langley Research Center Hampton, VA, USA Part 3: Different kinds of friction testing

2. What is wrong with the statement: Its raining heavily – this would be a good time to run our CFME … ? Operational testing (testing in natural conditions) is only useful in freezing conditions More than 1mm water at the tyre-surface interface will lead to misleading results

3. Operational friction tests almost always consist of a pair of runs, one on each side of the centreline. Maintenance friction tests may consist of a pair of runs, one on each side of the centreline, or … Maintenance friction tests may consist of a pattern of runs right across the runway