Chapter 1 - Air Law, The Clean Aircraft Concept

Summary - Chapter 1

  • History has shown that numerous aircraft accidents have occurred due to contaminated critical surfaces from frost, ice or snow.
  • Aircraft performance degradation is wide-ranging and unpredictable.
  • Frozen contamination has two affects on aircraft by increasing the all-up-weight and reducing aircraft performance.
  • The significance of these conditions led to the "Clean Aircraft Concept."
  • The Clean Aircraft Concept is essential to the maintenance of flight safety and the PIC has the ultimate responsibility to determine if the aircraft is in a condition for safe flight.
  • Canadian and Foreign Operators in Canada may take-off with hoar frost on the fuselage if the following conditions are met:
    1. Hoar-frost shall be the only acceptable contaminant on the fuselage only, of aircraft with engines mounted on the rear fuselage.
    2. Prior to conducting a takeoff, the operator shall ensure that the hoar-frost is not mixed with other contaminants such as ice or snow. If any other contaminant or contaminants are on the fuselage, the operator shall deice the entire fuselage.
    3. A copy of this exemption shall be attached to the Aircraft Deicing/Anti-icing Procedures in the Operator's Manual.
  • Aircraft may be permitted to take-off with hoar frost on the fuselage of rear mounted engines or when cold soaked ice exists on the underside of the wing, if approved in the aircraft manufacturers instructions.
  • It is everyone's responsibility to report contamination issues to the PIC immediately.
  • The removal of the contaminants prior to flight operations is accomplished through the application of a heated deicing fluid that melts the ice and removes it from the aircraft. In addition, an ice-preventive agent (anti-icing fluid) may be applied to critical surfaces prior to take-off, to prevent the accumulation of ice on critical surfaces.

When in Doubt... Ask, Investigate, Check!