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Redline NG when not expecting it

Scheduled Pinned Locked Moved Piston & Turbine Dukes
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  • K Offline
    K Offline
    KRoy7
    wrote on last edited by
    #1

    I was trying to find the root cause of an alarm in cruise flight (see picture), and had to pull the TQ back below 1000 ft-lb and then the alarm went off. Would appreciate guidance on where my root cause might be, I followed each of the checklists along the way.

    Thanks ...

    NG.png

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    • OrlaamO Offline
      OrlaamO Offline
      Orlaam
      wrote on last edited by
      #2

      Looks like you are overspeeding. Redline is 200 knots.

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      • Black SquareB Offline
        Black SquareB Offline
        Black Square
        Black Square Developer
        wrote on last edited by
        #3

        Exactly 🙂

        I suspect you're not the only one to do this, because I've heard an improbably high number of users complaining about a "CO2 alarm" in cruise in the turbine aircraft within 24 hours of the aircraft releasing.

        K 1 Reply Last reply
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        • Black SquareB Black Square

          Exactly 🙂

          I suspect you're not the only one to do this, because I've heard an improbably high number of users complaining about a "CO2 alarm" in cruise in the turbine aircraft within 24 hours of the aircraft releasing.

          K Offline
          K Offline
          KRoy7
          wrote on last edited by
          #4

          @Black-Square So the turbine Duke's speeds (below) are much higher, I understand they are True Airspeeds, not indicated airspeed. But obviously I did not consider that. Ok, this is great education. The checklist values clearly would be variable as well based on density altitude I suppose.

          Aircraft Performance (Turbine Duke)
          Maximum Cruising Speed 320 ktas
          Normal Cruising Speed 290 ktas
          Economy Cruising Speed 225 ktas

          Appreciate the feedback! Kirk

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