Runway Friction Measurement By Thomas J. Yager NASA Langley Research Center Presented at FAA/Aviation Industry Workshop on Runway Condition Determination, Reporting and Report Dissemination FAA Headquarters; Washington DC August 7-8, 2006

Test Aircraft Falcon 20 Dash 8 B727-100 B737-100 B757-100

Ground Test Vehicles Instrumented Tire Test Vehicle Diagonal Braked Vehicle Electronic Recording Decelerometer Vehicle Runway Friction Tester Airport Surface Friction Tester Surface Friction Tester

IMAG Variable/Fixed Slip Runar Variable/Fixed Slip Ground Test Trailers IMAG Variable/Fixed Slip GripTester Fixed Slip Runar Variable/Fixed Slip BV-11 Skiddometer E-274 Skid Trailer

Aircraft vs. IRFI

CRFI Table

IRFI Table

Joint Program Summary In nearly 10 years of the joint program, tests have involved 10 aircraft 49 ground vehicles 10 test sites 450 individuals representing over 65 organizations from 16 different countries have participated The Canadian and the International Runway Friction Indices have been established

Friction Measurement Variables Operator Equipment calibration & maintenance Test procedure Runway conditions Braking methods Compliance to existing standards

Future Activities and Recommendations Prepare and publish Joint Program final report and recommendations Involve other organizations in ongoing research investigations, e.g. collect aircraft/ground vehicle friction data at airport in Traverse City, MI Solicit more government/industry support and funding to maintain availability of NASA B-757 test aircraft Establish calibration centers for friction measuring equipment Encourage ICAO to form a runway friction study group Perform EMAS study at NASA Langley’s ALDF test track Conduct NASA’s 14th annual workshop, May 14-18, 2007

Fourteenth Annual NASA Tire/Runway Friction Workshop WELKOM VELKOMMEN YOKOSO BENVENUTO WILLKOMMEN WELCOME Fourteenth Annual NASA Tire/Runway Friction Workshop May 14-18, 2007 NASA Wallops Flight Facility Website: http://runfric.larc.nasa.gov VELKOMMEN WELKOM WELCOME WILLKOMMEN BENVENUTO

Test Site 2 Taxiway 4/22 “ECHO” R/W 4/22 Not to scale 300’ 222’ 300’ 300’ LS1 Echo 3 M1 10’ R-1 R-2 R-3 300’ 300’ 300’ RS4 Echo 2 EK3 EK4 Echo 1 EK1 EK2 75’ MS/0 10’ Asphalt Surface 10’ 48’ 156’ MS/1 909’ 4’ P-1 P L MS/2 10’ Echo 4 R-5 MS/3 10’ 300’ N159 Ramp N159 Ramp