Hoar frost and rime ice is much more of an impediment to lift ( think sandpaper ) and flight than clear ice ( think clear tape ) or snow that is not adhering to the airframe.
Canadian CARS
- 602.11 (1) In this section, critical surfaces means the wings, control surfaces, rotors, propellers, horizontal stabilizers, vertical stabilizers or any other stabilizing surfaces of an aircraft, as well as any other surfaces identified as critical surfaces in the aircraft flight manual.
- (2) No person shall conduct or attempt to conduct a take-off in an aircraft that has frost, ice or snow adhering to any of its critical surfaces.
- (3) Despite subsection (2), a person may conduct a take-off in an aircraft that has frost caused by cold-soaked fuel adhering to the underside or upper side, or both, of its wings if the take-off is conducted in accordance with the aircraft manufacturer’s instructions for take-off under those conditions.
JOKE
MUCH more confusing Bafflegab Follows.
Joke Over