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PFD CAM : Climb Phase

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Uploaded by on Jul 14, 2009

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Uploader Comments (lzd772)

  • Hi Sir. Brilliant video yet again.

    1. Why did you not fly around the bad weather that appeared on the screen.

    2. what determines whether or not you fly through turbulance or go around it.

    Many thanks! Keep the videos coming.

  • 1. Too widespread. Anyway it was a layer of cloud, not a thunderstorm cell.

    2. The severity of the weather returns. The returns were mostly green so it would not be too bad to go through it.

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  • @makirigermany

    Why not? The lower the IAS at the same Climb-Thrust-Setting, the higher the Climbrate can be. With this Climbrate you can reach your Initial Cruise Level very fast and the faster you reach your Cruise Level you will save Fuel burn because the lower Windpressure at high Altitudes.

  • from 17.000 to 35.000 in about 5min...=D... whats up there??

  • hmmm climbed to 35000ft from 17000 in 5 mins?? at around 270 kts????

  • Yes, SPD intervention is used (i.e. opening the speed window by pushing the speed knob) when the speed 'runs away'. When that happens, VNAV SPD is annunciated.

  • Thanks. PSS is pretty off for VNAV descent then...

    I saw on PFD Descent videos that sometimes VNAV PTH changed to VNAV SPD for a short time and then back to PTH. Does that happen if speed needs to be managed?

  • If VNAV PTH is used, you'll see SPD change to IDLE on descent. Once the thrust levers are at idle, it changes to HOLD.

    It'll change to SPD whenever thrust is commanded to maintain the target speed.

    On IDLE and VNAV PTH, speed is not really controlled. Autopilot adjusts the pitch to maintain the desired descent profile and autothrust remains idle. Actual speed can 'run away' from the desired VNAV speed, especially if the aircraft is high on profile.

  • Hi lzd772,

    What is the normal FMA for descent in the T7? Until when does the thrust stay on IDLE (eg. when does it go to SPD)? If it is on IDLE and VNAV PTH, what controls the speed? (PSS doesn't have it right as it always uses SPD mode during descent as slionboy mentioned)

  • Yes, I was talking about the default one. You can delete it.

    Well, then I'm not sure why it behaves like this. Perhaps you can check with the experts like jim or R1door

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