ACS AI.X.C

Purpose of and procedures for power-off stalls.

Aerodynamics associated with stalls in various airplane configurations, including the relationship between angle of attack, airspeed, load factor, power setting, airplane weight and center of gravity, airplane attitude, and yaw effects.

Stall characteristics as they relate to airplane design, and recognition impending stall and full stall indications using sight, sound, or feel.

Factors and situations that can lead to a power-off stall and actions that can be taken to prevent it.

Fundamentals of stall recovery.

Common errors related to this Task.

Factors and situations that could lead to an inadvertent power-off stall, spin, and loss of control.

Range and limitations of stall warning indicators (e.g., aircraft buffet, stall horn, etc.).

Stall warning(s) during normal operations.

Stall recovery procedure.

Secondary stalls, accelerated stalls, and cross-control stalls.

Effect of environmental elements on airplane performance related to power-off stalls (e.g., turbulence, microbursts, and high-density altitude).

Collision hazards.

Distractions, task prioritization, loss of situational awareness, or disorientation.

Clear the area.

Select an entry altitude that allows the Task to be completed no lower than 1,500 feet above ground level (AGL) (ASEL, ASES) or 3,000 feet AGL (AMEL, AMES).

Configure the airplane in the approach or landing configuration, as specified by the evaluator, and maintain coordinated flight throughout the maneuver.

Establish a stabilized descent. 68

Transition smoothly from the approach or landing attitude to a pitch attitude that induces a stall.

Maintain a specified heading, ±10° if in straight flight; maintain a specified angle of bank not to exceed 20°, ±5° if in turning flight, until an impending or full stall occurs, as specified by the evaluator.

Acknowledge the cues at the first indication of a stall (e.g., aircraft buffet, stall horn, etc.).

Recover at the first indication of a stall or after a full stall has occurred, as specified by the evaluator.

Configure the airplane as recommended by the manufacturer, and accelerate to best angle of climb speed (VX) or best rate of climb speed (VY).

Return to the altitude, heading, and airspeed specified by the evaluator.

Analyze and correct common errors related to this Task.