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Gyro Suction High

Scheduled Pinned Locked Moved TBM 850
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  • peterhemmP Offline
    peterhemmP Offline
    peterhemm
    wrote on last edited by
    #1

    Noticed the gyro suction showing high, something I've not seen before. Any reason for this? BTW, no active failures atm.

    TBM850 Suction High.jpg

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    • S Offline
      S Offline
      schultenh
      wrote on last edited by
      #2

      It actually shows low. It looks like you are still on the ground. When the engine is at a low power setting, the bleed air from the engine is not enough for the ejector to produce a sufficient vacuum. Once you advance the throttle it should rise.

      peterhemmP 1 Reply Last reply
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      • Black SquareB Offline
        Black SquareB Offline
        Black Square
        Black Square Developer
        wrote on last edited by
        #3

        It can also read lower in the green band when operating at the service ceiling of the aircraft. My TBM and Dukes also have a "Partial Vacuum" failure, which reduces the vacuum suction or instrument air pressure to around half of whatever it would normally be, as if the pump's impellers have lost several vanes. This goes hand-in-hand with my new gyroscope physics simulation, as the result will be a sluggish gyro, which could become violently unstable if too much torque is applied by the motion of the aircraft.

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        • S schultenh

          It actually shows low. It looks like you are still on the ground. When the engine is at a low power setting, the bleed air from the engine is not enough for the ejector to produce a sufficient vacuum. Once you advance the throttle it should rise.

          peterhemmP Offline
          peterhemmP Offline
          peterhemm
          wrote on last edited by
          #4

          @schultenh oops, didn't realize the gauge markings went high to low.

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