Flight Instructors Training Procedures _revised AIC_x

1. AIM
DEFINITION
EXERCISE 10B
STALLING
Stalling is a condition of flight which occurs when the angle between the wing and the relative airflow
exceeds the critical angle of attack, causing the airflow over the surfaces of the wing to break away
resulting in a loss of lift, loss of altitude and a pitching moment. An aircraft could stall at any airspeed,
any attitude, any power setting, any configuration and at any weight or loading.
WHAT THE INSTRUCTOR IS TO TEACH
i. Discuss the principles involved.
ii. The air exercise briefing:
a. Applicable procedures and checklists.
b. Aircraft handling techniques:- Demonstration and Observation.
c. Consideration of airmanship and engine handling.
d. Similarity to previous exercise.
e. De-briefing after flight.
WHY IT IS BEING TAUGHT
To give the student a good understanding and thorough knowledge of the principles required to:
i. Recognise the symptoms of an approaching stall.
ii. The characteristics of the stall.
iii. The recovery procedure, with emphasis on recovering with the minimum loss of altitude.
HOW THE EXERCISE APPLIES TO FLYING
This is an abnormal condition of flight which may occur during flight manoeuvres entailing slow flight,
high angle of attack and high speed/high loadings.
2. PRINCIPLES INVOLVED
1. RECAP ON:
Exercise 4, Para 2.1 (i) and (ii) − Effects of Controls.
2. NEWTON’S LAWS
Inertia.
3. DISCUSS THE FORCES AND COUPLES ON AN AIRCRAFT APPROACHING THE STALL:
LIFT
i. Formula.
ii. Boundary Layer flow – adverse pressure gradient.
iii. Movement of Centre of Pressure (C.P.) with angle of attack.
iv. Airflow at Critical Angle of Attack.
v. Basic stalling speed as per aircraft manual.
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