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Principles of flight
5.4.1.1 Development of a stall
Symptoms that a stall is developing can include:
- The airspeed indicator shows low speed for the given situation
- The stall warning light (if the aircraft is equipped with one) comes on about
5-10 knots before the stall
- A high-pitched warning sound – stall warning (if the aircraft is equipped
with one)
- Wind noise
- Changes in engine sound
- Vibrations or shaking in the control surfaces, etc.
- A feeling that the controls are easier to move (but not in a high-speed stall)
Modern aircraft have such good stall characteristics that the only thing typically
noticed is the aircraft nose dropping, the speed building up, and the aircraft
flying again.
A stall is normally not a dramatic situation as many might believe.
5.4.1.2 Stall speeds
The airspeed indicator shows two stall speeds:
The lowest speed in the white arc (approximately 54 Kt) is the stall speed:
- With full flaps
- At MSL (Mean Sea Level)
- Engine at idle
- On a standard day
The lowest speed in the green arc is the stall speed:
- With flaps up
- Engine at idle
- At maximum takeoff weight (MTOW)
- At MSL
- On a standard day
Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 463
