Visual - Visual assessment will only give a X macrotexture very crude assessment of the macrotexture. Extensive rubber buil-up can be identified. Visual - Visual assessment will give a very X microtexture crude assessment of the microtexture and to what degree the microtexture has been has been CHARACTERISTICS filled and covered by rubber. Visual runway Visual assessment during a rain X – geometry and subsequent drying process (ponding) of the runway will reveal how the runway drains and if there has been FRICTION any changes to runway geometry causing ponding. Depth of any pond can be measured by a ruler or any other appropriate depth SURFACE measurement method/tool. TO By touch - Assessment touch“ can X „by macrotexture differentiate between degree of loss of texture but not quantifying it. By touch - Assessment touch“ can identify X „by CHANGE microtexture if microtexture has been filled OF in/covered by rubber-build up. Grease smear Measure a volume Mean Texture X – method (MTD) Depth (MTD) primarily by using TREND the grease smear method, is the measurement method used for research purposes related to aeroplane performance. Sand (glass) Measure a volume Mean Texture X – patch method Depth. The sand (glass) patch MONITIORING (MTD) method are not identical to the grease smear method. There is at present no internationally accepted FOR relationship between the two methods. Laser Measure a profile Mean Profile X – – stationary Depth (MPD). There is no METHODS (MPD) established relationship between MTD and MPD. The relationship Laser moving – must be established for the laser (MPD) devices used and the preferred volumetric measurement method ASSESSMENT used.
ASSESSMENT METHODS FOR MONITIORING TREND OF CHANGE TO SURFACE FRICTION CHARACTERISTICS Visual - macrotexture Visual assessment will only give a very crude assessment of the macrotexture. Extensive rubber buil-up can be identified. X Visual - microtexture Visual assessment will give a very crude assessment of the microtexture and to what degree the microtexture has been has been filled and covered by rubber. X Visual – runway geometry (ponding) Visual assessment during a rain and subsequent drying process of the runway will reveal how the runway drains and if there has been any changes to runway geometry causing ponding. Depth of any pond can be measured by a ruler or any other appropriate depth measurement method/tool. X By touch - macrotexture Assessment „by touch“ can differentiate between degree of loss of texture but not quantifying it. X By touch - microtexture Assessment „by touch“ can identify if microtexture has been filled in/covered by rubber-build up. X Grease smear method (MTD) Measure a volume – Mean Texture Depth (MTD) primarily by using the grease smear method, is the measurement method used for research purposes related to aeroplane performance. X Sand (glass) patch method (MTD) Measure a volume – Mean Texture Depth. The sand (glass) patch method are not identical to the grease smear method. There is at present no internationally accepted relationship between the two methods. X Laser – stationary (MPD) Measure a profile – Mean Profile Depth (MPD). There is no established relationship between MTD and MPD. The relationship must be established for the laser devices used and the preferred volumetric measurement method used. X Laser – moving (MPD)
MFL_Information_Paper_(Armann_Norheim_FTF).docx