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Old 13th Jan 2018, 14:10   #1 (permalink)
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Engine Clearing Procedures in Toronto

Toronto ATIS often mentions that aircraft requiring an engine clearing procedure before takeoff must advise atc on initial taxi

I tried google, and this site's search function but with little clarification

Is this a procedure to shed ice from fan blades?

Or is this a procedure to help prevent traces of de/anti icing fluid from entering the airconditioning system at a critical time on takeoff?

Thanks in advance for replies
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Old 14th Jan 2018, 02:07   #2 (permalink)
 
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Quote:
Originally Posted by hawk37 View Post
Is this a procedure to shed ice from fan blades?
In general, yes. Some engines require a runup as long as 30 seconds before takeoff when in potential icing conditions and engine anti-ice is in use.
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Old 15th Jan 2018, 20:06   #3 (permalink)
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I thought there may be some replies on the de/anti icing fluid entering the airconditioning system idea. Guess not?

Thanks Intruder
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