Joint investigations have been carried out regarding the following problems: The atmospheric icing environment for modern transport aircraft; ice shapes and sizes on models in an icing wind tunnel; methods for making molds of ice; the effects of ice and hoar frost imitators on aerodynamic characteristics for a number of wing section and ice shapes, including advanced high lift devices; and flight tests for the determination of the effect of ice on flying characteristics. Icing effect prediction is discussed. Conclusions are presented which were reached from recent tests in a wind tunnel on a clean NACA 65A215 airfoil section as well as in a number of high-lift configurations with limited hoar frost and ice, and from flight tests. The findings indicate that: one must never ignore even slight icing; indications of the start of flow separation from the wind due to icing may be light buffeting of the aircraft, reduction of aileron control forces and roll disturbances; the development of flow separation from the wing due to icing is accelerated by a low landing approach speed and rough application of load factor larger than unity; the need for a timely activation of the anti-icing system.

  • Corporate Authors:

    International Civil Aviation Organization

    Attn: Document Sales Unit, 999 University Street
    Montreal, PQ  Canada  H3C 5H7
  • Authors:
    • Ingleman-Sundberg, M
    • Turnov, O K
  • Publication Date: 1977-10

Media Info

  • Pagination: p. 11-13
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00173845
  • Record Type: Publication
  • Source Agency: ICAO Bulletin, Public Information Office
  • Files: TRIS
  • Created Date: Jun 28 1978 12:00AM