Bombardier decided after several contaminated wing accidents with the CRJ200 that is was to be required to turn on the wing anti-ice inside of two minutes prior to take-off in order to de-ice the protected portion of the wing leading edge from missed frost and ice, or ice that may have formed while taxing. The wing anti-ice may then be turned off for take-off if not required. This procedure is still required whenever the temperature is 5 deg C or less with or without precipitation falling. They stated they would rather pilots do this for every flight when temps are low vs only deicing whenever contamination is found, (still required) because of the critically important need of maintaining a clean leading edge on a wing that doesn't have leading edge devices, (slats/leading edge flaps).
A cheap and effective mitigation strategy that has worked on the CRJ200 with a similar wing that has hard leading edge.
As a side note the CRJ200 and most other transport jets don't even have tail anti-ice capability. The engineers determined it was not required.
Last edited by cappt; 31st Dec 2019 at 15:04.