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A, B, C aircraft type classification

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  • A, B, C aircraft type classification

    Hi,

    I'm having the hardest time understanding the AC perfs classes.

    Please have a look at that list :


    Turbojets
    Jets
    Turbine
    Turboprops
    Turboshaft
    Turbofan
    Propellors
    Small reciprocating engines
    Large reciprocating engines
    Piston

    What would you put into wich class of aircraft ?

    Regards,
    Mathieu

  • #2
    Hi there - if you have the Bristol notes, in Chapter 1 (or Lesson 1), you have a list of definitions that you will find useful as you go through the course. These definitions are copied from Regulation (EU) 965/2012 Annex 1 Definitions. You can also find this information through the EASA Documentation web site (Google EASA Document library - search for Easy Access Rules for Air Operations (Regulation (EU) No 965/2012)

    The numbers in the lists (EASA v BGS notes) do not agree because the list in regulations has been updated - but you will find:

    (93) performance class A aeroplanes means multi-engined aeroplanes powered by turbo-propeller engines with an MOPSC of more than nine or a maximum take-off mass exceeding 5 700 kg, and all multi-engined turbo-jet powered aeroplanes;

    (94) performance class B aeroplanes means aeroplanes powered by propeller engines with an MOPSC of nine or less and a maximum take-off mass of 5 700 kg or less;

    (95) performance class C aeroplanes means aeroplanes powered by reciprocating engines with an MOPSC of more than nine or a maximum take-off mass exceeding 5 700 kg;


    Hope that helps - do not forget the list - it will be useful!

    Tom

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    • #3
      Thx, for your answer,

      Regards,

      Mathieu

      Comment


      • #4
        Tom , I have another concern.
        In wich class do you put :
        Turboprop ME with MOPSC < 9
        Prop with MOPSC > 9
        Reciprocating with MOPSC < 9

        Thank you for your help,
        regards,
        Mathieu

        Comment


        • #5
          Mathieu - we need to consider maximum take-off mass as well

          (93) performance class A aeroplanes means multi-engined aeroplanes powered by turbo-propeller engines with an MOPSC of more than nine OR a maximum take-off mass exceeding 5 700 kg, and all multi-engined turbo-jet powered aeroplanes;

          (94) performance class B aeroplanes means aeroplanes powered by propeller engines with an MOPSC of nine or less AND a maximum take-off mass of 5 700 kg or less;

          (95) performance class C aeroplanes means aeroplanes powered by reciprocating engines with an MOPSC of more than nine OR a maximum take-off mass exceeding 5 700 kg;

          So, considering each of these

          Turboprop ME with MOPSC < 9 CLASS A if MTOM > 5700 kg, otherwise CLASS B
          Prop with MOPSC > 9 CLASS C
          Reciprocating with MOPSC < 9 CLASS C if MTOM > 5700 kg

          I hope that makes sense - I'm beginning to doubt myself now!

          Tom

          Comment


          • #6
            I see, so it is assuming that a plane that doesnt meet the "performances requirements linked with MTOM/MOPSC limitations" of its class automatically falls back to the class below.

            So far I considered engine type being a requirement too. I mean on the EASA report, they say "Perfs class C are reciprocating engines meeting certain weight and capacity conditions"... a Propeller engine airplane doesn't become a reciprocating engine airplane just because it has more than 9 seats...
            But in the end its just about performances. Lighter planes have better performances, propeller engine gives better performances, and both factors are used to calculate performances.
            So I guess I got it.
            Thanks a lot, best regards,

            Mathieu

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