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Slow Flight

Asked by: 2617 views Aerodynamics, FAA Regulations, Flight Instructor, General Aviation, Private Pilot

 ACS state to establish and maintain an airspeed 5-10 knots above the 1G stall speed. Can anyone explain me what its trying to say? Is it Vso+5?

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2 Answers

  1. Best Answer


    Mark Kolber on Jul 02, 2016

    If you are asking whether the configuration is clean or dirty, I’d say both or either, just as it has always been. Other than that…

    This is one of those few tasks the ACS changed from the prior PTS task. But you need to read the full description to get the full flavor:

    “Establish and maintain an airspeed, approximately 5-10 knots above the 1G stall speed,
    at which the airplane is capable of maintaining controlled flight without activating a stall
    warning.”

    rather than the PTS’s

    “Establishes and maintains an airspeed at which any further increase in angle of attack, increase in load factor, or reduction in power, would result in an immediate stall.”

    PTS standard was closer to a stall. with the stall warning often blaring throughout the maneuver.

    I don’t know the reason for the change but what I think they are looking for is precise airspeed control, in the case of the new ACS task, slow enough to be near a stall but high enough to avoid hearing the stall warning. I think it’s going to require you to know your airplane – during training to learn when the stall warning goes off and to learn how to maintain a configuration just above that.

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  2. Skyfox on Jul 07, 2016

    Vs (clean or in landing configuration) is based on a load factor of 1, ie. there is no sharp pull-up for a climb (or pull-out from a dive) or any turning that would increase the load factor and result in something greater than 1 G of downward force. So, when they want 5-10 kts above the 1 G stall speed, that means whatever the POH lists as Vs (or Vs0 or Vs1, depending on the configuration), slow flight should be performed at a speed 5 or 10 knots above that speed.

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