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Thomas J. Yager - Articles and news items

Runway Friction Measurement Status

Issue 1 2009, Past issues  •  7 February 2009  •  Thomas J. Yager, Distinguished Research Associate, NASA Langley Research Center, Hampton, Virginia USA

With today's technology, the measurement of ‘friction' can be readily and accurately determined whether it be in a vehicle engine, wheel bearing, or of more immediate attention, the interface between a moving vehicle tire and the travelled pavement surface. In regards to ground vehicle and aircraft operations, the problem is not one of accuracy but one of timeliness. Mother Nature can change a dry, high friction pavement surface into an icy, low friction surface in a matter of minutes. The ground vehicle runway friction value measured 30 minutes earlier may have no relevancy to current pavement friction conditions. Hence the importance of giving pilots the time of the friction measurement as well as the actual value.

Runway Friction Measurement Activities in the US

Issue 3 2007, Past issues  •  7 June 2007  •  Thomas J Yager, Senoir Research Engineer, NASA

During the past year, several new runway friction measurement activities have been initiated and progress has been made to improve measurement equipment, techniques and recommended procedures. The purpose of this article is to acquaint you, the reader, with recent developments including...


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