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3 Answers

Pitot probe

Asked by: 3394 views Aircraft Systems, Airspace

When the aircraft is descending, if pitot probe is blocked and drain is open, the ASI will a. Over read b. Under read c. Not read

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3 Answers



  1. Brian on Nov 14, 2013

    Ask yourself what the pitot tube is giving you for information; ram air, right? Without any ram air what would you expect to have as a reading?

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  2. Wes Beard on Nov 14, 2013

    The airspeed indicator takes the pitot pressure and subtracts the static pressure. The drain hole effectively makes the pitot pressure zero once the pitot is blocked.

    0-{some value} = Zero airspeed reading.

    Give it a try! http://luizmonteiro.com/Learning_Pitot_Sim.aspx

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  3. Kris Kortokrax on Nov 17, 2013

    A good reference for your questions is the Pilot’s Handbook of Aeronautical Knowledge.

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