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September 18, 2021

Benyamin Amiri

By: Benyamin Amiri

Stall

Reading time: 9 min

    Content List

In this lesson, we will examine what is stall, the stall definition, the recognition of the stall, and how to recover an airplane from a stall condition.

Stall Definition

A sudden decrease in lift production when the wing exceeded the critical angle of attack is called a stall.

Increasing the angle of attack beyond the CLmax disrupts the progressive airflow from the upper wing surface. At first, the airflow starts to separate from the trailing edge. As the angle of attack increases further, the airflow separation proceeds forward until the wing stalls completely.

When the stall occurs, the airflow on top of the wings breaks away, darg increases and the lift force significantly reduces, and it causes no longers to be able to support the weight of the airplane which results in loss of altitude.

A stall always occurs at the same angle for a given airplane, regardless of the airplane’s airspeed, flight attitude, or weight. Thus, an airplane can be stalled at any airspeed and in any flight attitude.

Another important thing you should know is a stall does not mean that the airplane’s engine(s) have stopped working or that the airplane is not moving.

Stall Recognition

A first the pilot must identify the flight conditions that caused the stall to occur and know how to take the necessary corrective action for stall recovery. This level of skill requires sufficient learning and experience that the pilot understands through sight, sound, and feeling during the flight.

1- Stall warning horn that can be easily heard in the cockpit if the airplane is equipped with this system

2- airplane buffeting

3- Noise reduction

Reducing of airflow’s sound when passing over the wings

4- High angle of attack (AOA) + Low airspeed

5- Mushy feeling in the flight controls (less effective controls)

Stall Recovery

1- pitch down the airplane’s nose to reduce the angle of attack.

2- If the airplane is in the bank, first level the airplane and then start to recovery.

3- add engine power as needed.

4- Return to the safe altitude and desire flight path.

During pilot training, pilot students practice two types of stall recovery to be prepared for stall recovery when dealing with a real stall.

  • Power-off stall: This type of exercise helps us to easily recover the airplane from the stall during an approach to the landing.
  • Power-on stall: also known as departure stalls, this type of exercise helps us to easily recover the airplane immediately after taking off.

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