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6 Answers

Multi Engine Inquiry

Asked by: 2650 views Aerodynamics, Aircraft Systems

I thought every propeller driven twin engine airplane has a blue line (Vyse) on the airspeed indicator.  I mention this because I saw a comment on another aviation blog that the Beech 1900 does not have the blue line.  If this is true for the Beech 1900 example, why?



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6 Answers

  1. Mark Kolber on May 11, 2014

    Dan, go to Part 23 and look up which aircraft are required to have a blue line indication.

    To help along, it’s 23.1545.

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  2. Dan Chitty on May 11, 2014


    Thank you. Further to this, why is it 6000 lbs. or less? I know the Beech 1900 is great than 6000 lbs. but how is Vyse determined/calculated for a airplane greater than 6000 lbs.

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  3. Bradley on May 11, 2014

    The requirements for the two catagories are totally different. An aircraft like the B1900 is a transport catagory. The climb in a single engine will be at a speed called V2. This speed will change based on aircraft weight, tempature, and flap setting. It will be calculated then “bugged” on the airpeed dial for refrence.

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  4. Mark Kolber on May 12, 2014


    Since I don’t fly twins, I really should leave this for the mult-folks but I can’t resist a guess. Since, like many other V-speeds, Vyse is weight dependent, my guess is that the FAA determined at some point that the possible weight variation in aircraft over 5,000 lbs made a blue line unhelpful as even a guideline.

    Probably wrong.

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  5. Kris Kortokrax on May 12, 2014

    When I look at the registration info for Beech 1900s on http://www.faa.gov, I see that the 1900C airplanes are certified as Normal category and 1900D airplanes are certified as Commuter category. Neither is a Transport category airplane (which are certified under Part 25).

    V2 is referenced in Part 23. This is available on http://www.faa.gov. Look in Part 23, Subpart B under Performance.

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  6. Dan Chitty on May 16, 2014

    Thank you for the feedback.

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