Measurement of Runway Friction Characteristics on Wet, Icy Or Snow Covered Runways: Progress Report

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Defense Technical Information Center, 1971 - Friction - 26 pages
Three methods of measuring runway friction characteristics are described and possible usage of the data obtained is indicated. The information presented reflects the current state-of-the-art for measurement and classification of the relative slipperiness of runway surfaces. The three methods described include: (1) The diagonal-braked vehicle test method for measuring stopping distances on paved surfaces, (2) the Mu Meter method for evaluating runway surface characteristics, and (3) the James Brake Decelerometer method for determining runway slipperiness in the form of a friction coefficient.
 

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Page 4 - ... precautions shall be taken beyond those imposed by laws and regulations to ensure maximum safety of operating personnel and other traffic. No test shall be made when there is danger that the dispersed water may freeze on the pavement. 6. Calibration 6.1 Speed— Calibrate the test vehicle speed indicator at the test speed by determining the time for traversing at constant speed a reasonably level and straight, accurately measured pavement of a length appropriate for the method of timing. Load...
Page 2 - Annual Book of ASTM Standards. Vol 04.03. ' Annual Book of ASTM Standards, Vol 09.02. plete stop is obtained. The resulting distance required to stop is recorded with the aid of suitable instrumentation, and the velocity at the moment of brake application is noted. The skid resistance of the paved surface is determined from the resulting stopping distance measurement and test speed as stopping distance number, SDN.
Page 4 - ... within 2 mph (3.2 km/h) when calibrated at 40 mph (64 km/h). 6.2 Distance — Calibrate the distance transducer and counter by traversing at the approximate test speed a reasonably level and straight, accurately measured pavement at least 0.5 mile (0.8 km) in length.
Page 4 - ... increment. The accelerometer output in gs should agree with the tangent of the angle within 0.01 g at each increment. 7. Preparation 7.1 Test Vehicle — Install test tires on one front and one rear wheel diagonally. Use similar pair of test tires with same tread type and condition. Condition new tires by running them at their rated inflation pressure on the test vehicle (or a similar vehicle) at a maximum of...

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