United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center (2000). Report of the 12A Working Group on Determination of Critical Ice Shapes for the Certification of Aircraft (Report No. DOT/FAA/AR-00/37). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93948
United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. Report of the 12A Working Group on Determination of Critical Ice Shapes for the Certification of Aircraft. Report no. DOT/FAA/AR-00/37. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 2000. https://rosap.ntl.bts.gov/view/dot/93948.
United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center Report of the 12A Working Group on Determination of Critical Ice Shapes for the Certification of Aircraft. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 2000, Report no. DOT/FAA/AR-00/37, ROSA P. https://rosap.ntl.bts.gov/view/dot/93948.
Task 12A of the Federal Aviation Administration (FAA) Aircraft In-Flight Icing Plan states that the "FAA, along with industry and research organizations, shall form a working group to explore categories of ice accretions that represent potential safety problems on aircraft" with the goal of developing guidance material on the determination of critical ice accretion shapes and roughness in aircraft certification. Accordingly, the 12A Working Group, on critical ice shapes used in icing certification, was formed under the joint leadership of the FAA and the National Aeronautics and Space Administration (NASA) in November 1997. This report describes the activities and findings of the 12A Working Group and its recommended actions for progress to meet the goals stated in the FAA Aircraft In-Flight Icing Plan.
United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center (2000). Report of the 12A Working Group on Determination of Critical Ice Shapes for the Certification of Aircraft (Report No. DOT/FAA/AR-00/37). United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. https://rosap.ntl.bts.gov/view/dot/93948
United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center. Report of the 12A Working Group on Determination of Critical Ice Shapes for the Certification of Aircraft. Report no. DOT/FAA/AR-00/37. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 2000. https://rosap.ntl.bts.gov/view/dot/93948.
United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center Report of the 12A Working Group on Determination of Critical Ice Shapes for the Certification of Aircraft. United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center, 2000, Report no. DOT/FAA/AR-00/37, ROSA P. https://rosap.ntl.bts.gov/view/dot/93948.
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