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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 Online
    Black SquareB Online
    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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  • K Offline
    K Offline
    KRoy7
    replied to Black Square 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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