Contaminated Aircraft
- A visual and tactile (touch) check of the wing leading edge and wing upper surface must be performed to ensure the wing is free from contamination (frost, ice, snow or slush), if the temperature is less than
+10 Celcius. - Remember...you may not know the temperature of the fuel in the wings. If the wing fuel is +0 degrees or less, any existing moisture (in the atmosphere or on the critical aircraft surfaces) to freeze onto the wing and control surfaces.
- Takeoff is prohibited with contamination adhering to critical areas and surfaces. The Clean Aircraft concept applies during all weather conditions.
Operations in Severe Icing Conditions
- Severe icing can result from environmental conditions outside of those for which the airplane is certified. Flight in freezing rain, freezing drizzle, or mixed icing conditions (supercooled liquid water and ice crystals) can result in ice build-up on protected surfaces exceeding the capability of the ice protection system, or can result in ice forming aft of the protected surfaces. This ice may not shed when the ice protection systems are used, and may seriously degrade the performance and controllability of the airplane.
- All wing icing inspection lights must be operative prior to flight into known or forecast icing conditions at night.
- When severe icing is occuring, use of the autopilot is prohibited! Note: The autopilot may mask tactile clues that indicate adverse changes in handling characteristics.
- When severe icing is occuring, leave flaps in their current positon...DO NOT extend or retract!
- If unusual or uncommanded roll control movement is observed, reduce angle of attack.
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