STALL .. STALL .. STALL..

What is a "stall"?

   A stall is simply a loss of "lift" (or lifting force) on the airplane wings that is needed to sustain the airplane in flight, causing the airplane to lose altitude considerably. Theoretically, a stall occurs when the airplane wings are subjected to such a high angle with the direction of airflow striking the lower wing surface (termed "angle of attack"), causing the airflow above the wings to become increasingly turbulent, which in turn would result in a considerable increase in drag to the airplane.

NOTES:
• Stall is definitely dangerous ONLY if it happens while the airplane is flown at relatively low altitudes and there is no room for an immediate recovery action by the pilot! The exception is during landing where the airplane is intentionally stalled at "only several inches" above the ground surface or runway, and is known as the "landing stall" – i.e. a "power-off stall" with landing gear down and full flaps.

• Stall does NOT necessarily happens while flying at slow speeds only, because it could also happen at any speeds, e.g. when abruptly pulling out from a dive as to cause the wings to instantly reach the so-called "critical angle of attack". This type of stall is also known as an "accelerated stall".

• For most general aviation and training airplanes, recovery could normally be done by positively applying forward pressure on the control stick/yoke to reduce the angle of attack from its critical angle, and simultaneously add power to minimize loss of altitude.