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Icing Checklist(Alternate Static Air)

Asked by: 2262 views Aircraft Systems, Commercial Pilot, General Aviation, Instrument Rating

In my Da-40 icing checklist it states to close emergency window in case if pitot heat fails and using Alternate static Air. Why do we have to close the emergency window?

It also states if the Pitot heat is working Emergency Window open as required. So if we are using the Pitot heat when should we open or when should we keep the emergency window close?

I fly in Arizona never seen icing plz help!

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1 Answers



  1. Mark Kolber on Nov 27, 2017

    Window closed when alternate static is being used is most likely due to concerns over airflow from the window affecting the read of static air.

    More of a guess on the window open as required in icing. The checklist calls for full cabin heat and high blower fan. The open window is a counterbalance so you (pilot, passengers) don’t get too warm.

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