Exercise 12 - Stalls

Air Exercise 12 — Stalls
Lesson ID: LS-PT-AE-012-001 Stage: Incubation Phase: Early PTR Prerequisite: Air Exercise 11 — Slow Flight Next Lesson: Air Exercise 13 — Spinning / Spin Awareness

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Objective of Air Exercise 12

A stall is one of the most important conditions a pilot must understand early in flight training.
The purpose of this exercise is not to “make the airplane fall.” The purpose is to help the student recognize the early signs of an approaching stall, prevent the stall when possible, and recover smoothly if the stall occurs.

By the end of this lesson, the student should understand:
● why a wing stalls,
● why stall speed can change,
● how to recognize an approaching stall,
● how to recover from an imminent stall,
● how to recover from a full stall,
● the difference between power-off, power-on, accelerated, turning, and departure stalls,
● why reducing angle of attack is the heart of every stall recovery.

The core idea is simple:
A stall is an angle-of-attack problem, not just an airspeed problem.

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What Is a Stall?

A stall occurs when the wing exceeds its critical angle of attack.
When this happens, airflow can no longer remain smoothly attached over the top of the wing. Lift decreases and drag increases. The aircraft may no longer be able to maintain the desired flight path unless the pilot reduces the angle of attack and recovers correctly.

A stall may happen:
● at high speed or low speed,
● nose-high or nose-low,
● wings level or banked,
● climbing, descending, or turning,
● with power on or power off.

The aircraft does not stall because it is “too slow” in a simple sense. It stalls because the wing has reached too high an angle of attack for the airflow to remain attached.

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Why Does a Wing Stall?

A wing produces lift when air flows smoothly over it.
At moderate angles of attack, the airflow remains mostly smooth, and lift increases as angle of attack increases.
As the angle of attack continues to increase, the airflow over the top of the wing becomes increasingly disturbed. The disturbed airflow begins near the trailing edge and progresses forward.
At the critical angle of attack, the airflow separation becomes serious enough that lift can no longer increase. Drag rises sharply, the pressure difference around the wing is reduced, and the wing stalls.

A useful way to think about it:
● Low angle of attack: airflow is smooth.
● Moderate angle of attack: airflow is still mostly attached; lift increases.
● High angle of attack: airflow becomes turbulent; lift stops increasing efficiently.
● Critical angle of attack exceeded: airflow separates; lift decreases and drag increases.

Most training aerofoils stall at approximately 15° to 17° angle of attack, but the exact value depends on the aircraft and wing design.

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Angle of Attack vs Aircraft Attitude

A common beginner mistake is thinking that the aircraft’s pitch attitude tells the whole stall story.
It does not.

Angle of attack is measured between the wing’s chord line and the relative airflow. Relative airflow is the airflow approaching the wing, opposite the aircraft’s flight path.

This means the aircraft can stall in many attitudes:
● nose-high,
● level-looking,
● nose-low,
● banked,
● climbing,
● descending.

The aircraft’s attitude is what you see relative to the horizon. Angle of attack is what the wing “feels” relative to the airflow.

That is why the student must not rely only on nose attitude or airspeed to understand stall risk.

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Stalling Speeds

An aircraft always stalls when the critical angle of attack is reached, but the indicated airspeed at which that happens can change.

The published stall speed is only valid for a specific configuration and condition. In real flight, stall speed is affected by several factors.

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Weight

An aircraft with more weight in it requires more lift.

To produce that extra lift, the wing must operate at a higher angle of attack for a given speed. Therefore, a heavier loaded aircraft will generally stall at a higher indicated airspeed than a lighter aircraft.

A lightly loaded aircraft normally stalls at a lower speed than the same aircraft at maximum weight.

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Balance / Centre of Gravity

Centre of gravity affects stall speed and stall behaviour.
A forward centre of gravity usually requires more tail-down force. This increases the total lift the wing must produce, which can increase stall speed.

A rearward centre of gravity may reduce the airspeed at which the stall angle is reached, but it can also create undesirable stability and recovery characteristics. Loading beyond the aft centre of gravity limit is especially dangerous.

The simple teaching point:
Aft CG may reduce stall speed, but it can make stall recovery worse. Never treat aft CG as a performance trick.

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Power

Power can affect stalling speed and stall behaviour.

In many propeller aircraft, power-on stalls occur at a lower indicated airspeed than power-off stalls because of propeller slipstream and the upward component of thrust.

However, power-on stalls can also be more difficult to control because the pitch attitude is higher, the stall may develop more abruptly, and yaw tendencies are stronger.

Power helps performance, but it does not cancel the critical angle of attack.

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Flaps

Flaps increase wing camber.
This allows the wing to produce more lift at a lower airspeed. Therefore, extending flaps usually reduces stall speed.
However, flaps also increase drag and change the pitch, control, and recovery characteristics of the aircraft.

Flaps are helpful, but they are not magic. They change the stall behaviour, not eliminate it.

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Pitch Changes

Abrupt pitch changes can temporarily increase load factor and angle of attack.

If the pilot pulls back sharply, the aircraft may stall at a higher airspeed than expected. This is especially important during pull-ups, abrupt recovery attempts, or aggressive manoeuvring.

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Angle of Bank

In a coordinated level turn, the steeper the bank, the greater the load factor.

As load factor increases, the wing must produce more lift. This raises stall speed.

This is why steep turns, climbing turns, descending turns, and low-speed turns require careful coordination and airspeed awareness.

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Aircraft Condition

A clean, well-maintained aircraft may have better stall characteristics than the same type of aircraft in poor condition.

Factors that can affect stall behaviour include:
● damaged wing surfaces,
● bugs or contamination,
● ice or frost,
● poor rigging,
● rough paint or leading-edge condition.

A contaminated wing may stall earlier and more aggressively.

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Retractable Landing Gear

Extending landing gear increases drag.

The exact effect on stall speed varies by aircraft, but configuration changes can affect drag, airflow, and recovery characteristics.

The student should follow the POH / AFM for the specific aircraft.

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Density Altitude

Density altitude does not usually change the indicated airspeed at which the aircraft stalls.

However, at higher density altitude, the true airspeed and groundspeed at the stall are higher.

That means the aircraft may cover more ground and have more kinetic energy even though the indicated stall speed appears the same.

This matters alot during takeoff, landing, and obstacle clearance.

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Symptoms of an Approaching Stall

Many aircraft do not have an angle-of-attack indicator, so the pilot must recognize the symptoms of an approaching stall.

Common symptoms include:
1. Reduced control effectiveness The controls, especially elevator and ailerons, may feel less responsive. Control pressure may feel softer or less precise.
2. Stall warning indication The stall warning horn, light, or other warning device may activate if the aircraft is equipped with one.
3. Buffet or vibration Turbulent airflow over the aircraft may cause buffet, shaking, or vibration. This may feel different from aircraft to aircraft.
4. Loss of altitude despite back pressure The aircraft may begin to sink even though the pilot continues to apply rearward elevator pressure.

The key warning is this:
If the control collumn is pulled back, aircraft is slow, nose-high, buffet is starting, controls feel soft, and altitude is decaying, you are likely close to the stall.

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Imminent Stall

An imminent stall is the condition where the aircraft is approaching the stall but has not fully stalled yet.

This is a critical recognition point.

The pilot should not wait for a full stall if the symptoms are already clear. The correct response is to reduce the angle of attack and restore normal airflow before the stall fully develops.

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Recovery From an Imminent Stall

The basic recovery is:
1. Reduce angle of attack Move the control column forward smoothly enough to reduce the angle of attack.
2. Apply power as needed Use appropriate power to reduce altitude loss and restore performance.
3. Maintain coordinated flight Use rudder and aileron correctly. Prevent yaw and avoid uncoordinated control inputs.
4. Return to stabilized flight Regain normal attitude, airspeed, and flight path.
5. Retrim when stable Once the aircraft is stabilized, trim as required.

The first action is always to reduce the angle of attack. Power helps, but power alone does not fix a stall if the angle of attack remains too high.

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Safety Before Practising Stalls

Intentional stalls must only be practised:
● with an instructor during training,
● over a suitable unpopulated area,
● at a safe altitude,
● after proper lookout,
● in accordance with the aircraft POH / AFM,
● in accordance with current school procedures and Transport Canada guidance.

Before intentional stalls, the student must complete:
1. Cockpit check Secure loose items, verify seatbelts, check carburetor heat if applicable, confirm engine instruments and configuration, and complete the aircraft-specific checklist.
2. Lookout Look carefully in all directions, especially below. Stalls involve altitude loss and changing aircraft attitude, so airspace awareness matters.

The objective is not to stall aggressively. The objective is to recognize onset and recover properly.

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Power-Off Stall Entry and Recovery

Power-off stalls generally simulate conditions that may occur during approach, descent, or landing.
Entry Concept

A typical power-off stall entry begins from straight-and-level flight.

General sequence:
1. Complete cockpit checks.
2. Complete a thorough lookout.
3. Reduce power smoothly.
4. Use rudder to maintain direction as power changes.
5. Maintain altitude with increasing back pressure as the aircraft slows.
6. Allow the airspeed to decrease into the slow-flight range.
7. Recognize decreasing control response and increasing stall symptoms.
8. Continue until the stall or stall warning condition required by the instructor is reached.

As airspeed decreases, the controls become less responsive. The aircraft may require more back pressure to maintain altitude until the stall occurs.

The student may notice:
● lower airspeed,
● softer control response,
● changing sound,
● buffet,
● sink,
● stall warning,
● nose drop.

Do not force the nose excessively high. The goal is to experience a realistic stall onset, not create an exaggerated unusual attitude.

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Power-Off Stall Recovery

A simplified power-off stall recovery is:
1. Reduce the angle of attack immediately. Move the control column forward smoothly enough to unstall the wing.
2. Apply power promptly and smoothly. Use power as required for the aircraft and exercise. In many training aircraft, full power is used for recovery, but the POH / AFM and instructor direction are the authority.
3. Coordinate with rudder and aileron. Keep the aircraft coordinated. Prevent yaw and correct any wing drop properly.
4. Regain the correct attitude. Recover to the appropriate climb or cruise attitude as directed.
5. Avoid excessive altitude loss. Use smooth, positive control inputs. Do not pull back aggressively before the wing is flying again.
6. Clean up and retrim as required. Resume normal power and configuration when safe, according to the aircraft procedure.

The important correction is:
Do not try to recover by pulling harder. Pulling harder increases angle of attack and can deepen the stall.

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Full Stall Recovery

In a full stall, the aircraft may show a more obvious nose drop, sink, buffet, or wing drop.

Recovery still follows the same principle:
1. Reduce angle of attack.
2. Apply power as necessary.
3. Coordinate rudder and aileron.
4. Regain flying speed.
5. Return to the desired attitude.
6. Minimize altitude loss without re-stalling.

If yaw or a wing drop occurs, do not panic. Begin the normal stall recovery. Keep the aircraft coordinated with the rudder and avoid aggressive or uncoordinated control inputs.
The wing must be unstalled before normal control effectiveness is fully restored.

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Wing Drop and Autorotation

If one wing stalls before the other, the aircraft may yaw and roll.

This can occur because one wing has more drag or less lift than the other. If the yaw and roll continue, the aircraft may move toward autorotation, which is associated with spin entry.

The practical lesson:
Stop the stall first. Reduce angle of attack, apply appropriate power, and coordinate the aircraft.

Avoid using aileron aggressively into a stalled wing. Follow the aircraft-specific recovery technique and instructor direction.

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Power-On Stall Entry and Recovery

Power-on stalls simulate conditions that may occur during takeoff, initial climb, overshoot, or departure.

The same basic stall principles apply, but the aircraft behaviour can be different.

Why Power-On Stalls Feel Different?

Power-on stalls can be more dramatic because:
● pitch attitude is usually higher,
● the stall may develop more quickly,
● the aircraft may yaw more strongly,
● torque and slipstream effects are stronger,
● rudder use is more important,
● ailerons may be less effective at low speed,
● the aircraft may be more difficult to keep coordinated.

Because propeller slipstream affects the elevator and rudder, those controls may remain effective longer than the ailerons. This can make the aircraft feel uneven in its control response.

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Power-On Stall Entry

A typical power-on stall entry:
1. Establish the correct setup and complete cockpit and lookout checks.
2. Apply power smoothly as directed.
3. Raise the nose smoothly.
4. Use rudder to maintain direction and prevent yaw.
5. Maintain the nose-up attitude as the aircraft slows.
6. Recognize the stall symptoms.
7. Recover at the stall or onset point specified by the instructor.

The student must be especially alert for yaw.
High power, high angle of attack, and low airspeed are a combination that demands precise rudder control.

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Power-On Stall Recovery

Recovery from a power-on stall follows the same foundation:
1. Reduce angle of attack.
2. Maintain or apply appropriate power as required.
3. Use rudder to prevent yaw.
4. Coordinate the controls.
5. Regain flying speed.
6. Return to the correct climb attitude.
7. Resume normal flight when safe.

In a power-on stall, loss of control can be more abrupt. Full and smooth use of the remaining power may be important, but the aircraft-specific procedure must always come from the POH / AFM and instructor.

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Acceleration Stalls

An acceleration stall occurs when the aircraft stalls at a higher-than-normal airspeed because of increased load factor and angle of attack.
At the same weight, configuration, and power setting, the aircraft will usually stall at the same indicated airspeed only if the load factor remains the same.
If the pilot increases load factor through abrupt control movement, steep bank, pull-up, or turbulence, the stall speed rises.

Acceleration stalls can occur during:
● steep turns,
● abrupt pull-ups,
● sudden manoeuvres,
● recovery attempts that are too aggressive,
● gliding turns,
● climbing turns,
● level turns,
● turbulence or gusts.

A key point:
Any control movement that increases G load can increase stall speed.
This means the aircraft can stall at an airspeed that looks safely above normal stall speed if the load factor is high enough.

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Turbulence and Gusts

Turbulence can create sudden changes in relative airflow.
A gust can abruptly increase angle of attack. This can bring the wing closer to the critical angle, even if the pilot has not intentionally pulled back.
That is why approach speeds are often increased slightly in turbulent conditions, according to aircraft guidance and school procedure.

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Manoeuvring Speed Reminder

An aircraft can be stalled at any airspeed if critical angle of attack is exceeded.
That does not mean it is acceptable to stall the aircraft at high speed.
At higher speeds, load factors and structural stress increase. This is why aircraft have manoeuvring speed limitations. Manoeuvring speed is intended to protect the aircraft from structural overstress during full control deflection, but it must still be respected as part of the aircraft operating limitations.

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Stalls During Turns

Stalls in turns are especially important because the aircraft may roll or yaw as the stall develops.
Level or Descending Turn

In a level or descending turn, the inside wing often stalls first.
This happens because the inside wing travels a shorter path and can be moving more slowly than the outside wing. It may produce less lift, sink, and meet the airflow at a higher angle of attack.
When it stalls, the aircraft tends to roll toward the inside of the turn.

In a descending turn, the geometry of the flight path can increase the risk because the inside wing may meet the relative airflow at a steeper angle of attack.

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Climbing Turn

In a climbing turn, the outside wing may meet the relative airflow at a higher angle of attack.
As a result, the higher wing may stall first and drop abruptly.
This is why low-speed climbing turns require careful coordination, especially during departure or overshoot.

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Departure Stalls

Departure stalls occur during takeoff, initial climb, or overshoot/missed approach.

These are serious because they happen:
● close to the ground,
● at low airspeed,
● with high power,
● with high pitch attitude,
● often with changing flap or trim,
● sometimes while turning,
● during a high-workload phase of flight.

After takeoff, the aircraft accelerates through a low-speed range at low altitude. Any abrupt pitch-up or reduction in power can cause the aircraft to approach a stall.

The correct takeoff attitude is critical.
A climb attitude that is too high may prevent acceleration and may lead toward a stall.

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Departure Stall From Takeoff

A departure stall may happen if the aircraft is rotated too aggressively or held at too high a nose attitude after takeoff or can’t climb out of ground effect.

The aircraft may be unable to accelerate or climb properly. If the stall occurs close to the ground, there may be insufficient altitude to recover.

This is why the student must learn the correct climb attitude and airspeed for the aircraft.

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Departure Stall During Overshoot / Missed Approach

Another common departure-stall scenario is the overshoot or missed approach.

The aircraft may be:
● slow,
● low,
● trimmed nose-up,
● configured with flaps,
● close to the ground,
● under high workload.

When full power is applied, the aircraft may pitch up. Nose-up trim from the approach may also try to force the nose higher.

The student must anticipate this and hold the correct pitch attitude until the aircraft is properly trimmed.

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Departure Stall Prevention

To avoid a departure stall during overshoot or missed approach:
1. Apply full power as required.
2. Anticipate nose-up pitch from power and trim. (Keep in mind how much you trim back the aircraft on your approach)
3. Hold the correct pitch attitude.
4. Prevent yaw with rudder.
5. Allow the aircraft to accelerate.
6. Retract flaps smoothly and in stages as directed by the POH / AFM.
7. Do not raise the nose suddenly to stop a sink.
8. Follow aircraft-specific procedures.

Very few light aircraft can sustain a good climb with full flap extended. However, retracting all flap at once may cause a sudden loss of lift and height.

Flap retraction must be smooth and according to procedure.

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Critical Stall Recovery Principle

Every stall recovery is built around the same principle:
Reduce the angle of attack first.

Power, rudder, aileron, trim, and flap management all matter, but they support the main action.
If the wing remains stalled, the aircraft cannot return to normal controlled flight.

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Common Student Errors

● Thinking stall is caused only by low airspeed.
● Trying to recover by pulling harder.
● Forgetting to reduce angle of attack.
● Waiting too long after recognizing symptoms.
● Adding power without lowering the nose.
● Overusing aileron during a wing drop.
● Ignoring yaw.
● Not using enough rudder in power-on stalls.
● Letting the aircraft enter uncoordinated flight.
● Practising without a proper lookout. (Forgetting the lookout is an automatic fail in a flight test)
● Letting the nose rise too high during power-on entry.
● Allowing excessive altitude loss during recovery.
● Pulling up too aggressively after recovery.
● Forgetting to reconfigure and retrim.
● Misunderstanding the effect of bank angle on stall speed.
● Forgetting how flaps and gear affect stall behaviour.
● Relying only on stall warning devices instead of aircraft feel.

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Common Misconceptions

“A stall means the engine quit.”
No. That is an engine failure. An aerodynamic stall is a loss of lift caused by exceeding the critical angle of attack.

“The aircraft stalls only when it is too slow.”
No. The aircraft stalls when the critical angle of attack is exceeded. Low speed is a common path to the stall, but not the only one.

“If the nose is down, the aircraft cannot stall.”
Wrong. The aircraft can stall at many attitudes depending on relative airflow and angle of attack.

“Power fixes the stall.”
Power helps recovery, but power does not fix a stall unless the angle of attack is reduced.
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“Aileron will pick up the dropped wing.”
Not always, and aggressive aileron use near the stall can make the situation worse. The aileron tries to lift the wing by increasing the angle of attack on a wing that has just surpasses it’s critical angle of attack. Reduce angle of attack and coordinate correctly.

“Stall warning means I still have lots of time.”
No. Stall warning means the aircraft is already close to the stall. Correct promptly.

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Instructor Emphasis

The instructor should strongly emphasize:
● angle of attack, not just airspeed,
● early recognition of symptoms,
● smooth reduction of angle of attack,
● prompt but controlled power use,
● coordinated rudder and aileron,
● avoiding aggressive pull-up after recovery,
● differences between power-off and power-on stalls,
● why turning stalls and departure stalls are more serious,
● why stalls close to the ground are dangerous,
● why students must not practise this without proper instruction and altitude.

The best teaching phrase:
Break the stall before you rebuild the flight path.

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Practical Stall Recovery Memory Aid

Use:
AOA — POWER — COORDINATE — RECOVER

Meaning:
1. AOA: Reduce angle of attack.
2. Power: Apply appropriate power.
3. Coordinate: Stop yaw and keep the aircraft coordinated.
4. Recover: Return to normal attitude, airspeed, and flight path.

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Key Takeaways

● A stall is caused by exceeding the critical angle of attack.
● A stall can occur at any attitude and practically any airspeed.
● Stall speed changes with weight, CG, power, flap, bank, pitch movement, aircraft condition, landing gear, and load factor.
● Indicated stall speed may remain similar with altitude, but true airspeed and groundspeed increase.
● Symptoms include soft controls, stall warning, buffet, and loss of height despite back pressure.
● Imminent stalls should be corrected before a full stall develops.
● The first recovery action is to reduce angle of attack.
● Power supports recovery but does not replace angle-of-attack reduction.
● Power-on stalls usually require strong rudder awareness.
● Accelerated stalls can happen at higher-than-normal airspeeds.
● Turning stalls can produce wing drop and roll toward the stalled wing.
● Departure stalls are especially dangerous because they occur close to the ground.
● Overshoot and missed-approach stalls can result from nose-up trim, full power, flap drag, and poor pitch control.
● Smooth, coordinated recovery matters more than dramatic control movement.

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Exercise Summary

Air Exercise 12 — Stalls teaches the student that a stall is an angle-of-attack problem. The lesson develops recognition of stall symptoms, understanding of factors that affect stall speed, and recovery technique for imminent, power-off, power-on, accelerated, turning, and departure stalls.
The student learns that recovery begins by reducing angle of attack, applying appropriate power, coordinating the aircraft, and returning to stabilized flight with minimum altitude loss.

ALBATROSS KNOWLEDGE GRAPH METADATA
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ALBATROSS KNOWLEDGE GRAPH METADATA
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IDENTITY

Content ID: LS-PT-AE-012-001
Content Type Code: LS
Domain Code: PT
Topic Code: AE-012
Sequence Number: 001
Knowledge Node ID: KG-PT-AE012-STALLS
Knowledge Family: Stalls
Entity Type: Flight Training Lesson / Knowledge Graph Node
Lesson Title / Content Title: Air Exercise 12 — Stalls
Short Title: Stalls
Canonical Topic: Stalls
Alternative Topic Names: Aerodynamic stall, aircraft stall, wing stall, stall recovery, imminent stall, full stall, power-off stall, power-on stall, departure stall, accelerated stall, turning stall, stall recognition, stall symptoms, critical angle of attack, angle-of-attack stall

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CLASSIFICATION

Domain: Pilot Training
Subdomain: Basic Aircraft Handling
Category: Air Exercises
Audience: Student Pilot
Jurisdiction: Canada / Transport Canada
Training System: Transport Canada PPL Flight Training
Certification Context: Private Pilot Licence — Aeroplane
Stage: Incubation
Phase: Early PTR
Training Level: Early Execution / Execution

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CORE KNOWLEDGE

Primary Concept: Recognizing, preventing, and recovering from aerodynamic stalls by understanding critical angle of attack, stall symptoms, changing stall speed factors, and coordinated recovery technique.
Plain-Language Definition: A stall happens when the wing is asked to work at too high an angle of attack. Airflow separates, lift decreases, drag increases, and the aircraft must be recovered by reducing the angle of attack.
Technical Definition: An aerodynamic stall occurs when an aerofoil exceeds its critical angle of attack, causing airflow separation over the wing, a decrease in lift, and an increase in drag. Stall recovery requires reducing the angle of attack, applying appropriate power, coordinating the aircraft, and returning to stabilized flight.
Key Principles:
● A stall is caused by exceeding the critical angle of attack.
● A stall is not caused by engine failure.
● A stall can occur at practically any airspeed and attitude.
● Aircraft attitude and angle of attack are not the same thing.
● Relative airflow determines angle of attack.
● Stall speed changes with aircraft condition, configuration, and load factor.
● A heavier aircraft generally stalls at a higher speed.
● Forward centre of gravity can increase stall speed.
● Rearward centre of gravity can make recovery more difficult.
● Power can change stall speed and stall behaviour.
● Flaps usually reduce stall speed but increase drag and change recovery characteristics.
● Increased bank angle and load factor increase stall speed.
● Abrupt pull-ups can create accelerated stalls.
● Turbulence and gusts can abruptly increase angle of attack.
● Stall symptoms include reduced control effectiveness, stall warning, buffet, vibration, and loss of height despite back pressure.
● Imminent stalls should be corrected before a full stall develops.
● The first stall recovery action is to reduce angle of attack.
● Power supports recovery but does not replace angle-of-attack reduction.
● Rudder coordination is critical, especially during power-on stalls and stalls during turns.
● Departure stalls are especially dangerous because they occur close to the ground.
● Stall practice must be conducted only under proper instruction, at safe altitude, with proper lookout, and in accordance with the POH / AFM and school procedures.
Underlying Theory: Aerodynamics of angle of attack, relative airflow, airflow separation, lift production, drag increase, critical angle of attack, load factor, stall speed variation, centre of gravity, wing contamination, flap effect, propeller slipstream, power-on effects, adverse yaw, autorotation, and spin entry risk.
Why It Matters: Stall recognition and recovery are core safety skills. Poor stall understanding can lead to loss of control during takeoff, climb, approach, overshoot, turning flight, or abrupt manoeuvring. The student must learn to recognize the onset early, reduce angle of attack promptly, and recover without creating a secondary stall or spin entry.
Content Role: Introduces and explains stall theory, recognition, prevention, and recovery as a foundation for safe aircraft handling and spin-awareness training.

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LEARNING FRAMEWORK

Learning Outcome: By the end of this lesson, the learner should be able to explain why a wing stalls, identify factors that affect stall speed, recognize symptoms of an approaching stall, describe recovery from imminent and full stalls, and explain the risks associated with power-off, power-on, accelerated, turning, and departure stalls.
Core Competencies:
● Stall recognition
● Stall prevention
● Angle-of-attack awareness
● Airspeed awareness
● Recovery technique
● Coordinated rudder and aileron use
● Power management
● Pitch control
● Load-factor awareness
● Turning-stall awareness
● Departure-stall prevention
● Overshoot / go-around awareness
● Aircraft configuration management
● Lookout discipline
● Risk recognition
● Loss-of-control prevention
Performance Standard: The student should recognize stall symptoms promptly, reduce angle of attack as the first recovery action, apply appropriate power, maintain coordinated control, recover to stabilized flight, and minimize altitude loss without entering a secondary stall. Exact tolerances, configurations, entry methods, and recovery procedures must follow the current Transport Canada flight test guide, POH / AFM, school SOPs, and instructor direction.
Prerequisites:
● LS-PT-AE-011-001 — Air Exercise 11 — Slow Flight
● LS-PT-AE-010-001 — Air Exercise 10 — Flight for Range and Endurance
● LS-PT-AE-009-001 — Air Exercise 9 — Turns
● LS-PT-AE-008-001 — Air Exercise 8 — Descending
● LS-PT-AE-007-001 — Air Exercise 7 — Climbing
● LS-PT-AE-006-001 — Air Exercise 6 — Straight-and-Level Flight
● LS-PT-AE-005-001 — Air Exercise 5 — Attitudes and Movements
Required Prior Knowledge:
● Slow flight
● Angle of attack
● Relative airflow
● Basic lift and drag
● Pitch and power relationship
● Rudder coordination
● Bank angle and load factor
● Flap effects
● Aircraft configuration awareness
● Airspeed indicator interpretation
● Lookout procedure
● Basic recovery from unusual aircraft attitudes
Common Student Errors:
● Thinking a stall is caused only by low airspeed
● Confusing an aerodynamic stall with engine failure
● Trying to recover by pulling harder
● Adding power without reducing angle of attack
● Waiting too long after recognizing stall symptoms
● Overusing aileron during a wing drop
● Ignoring yaw
● Not using enough rudder during power-on stalls
● Letting the aircraft become uncoordinated
● Allowing excessive altitude loss during recovery
● Pulling up too aggressively after recovery
● Creating a secondary stall
● Practising without proper lookout
● Letting the nose rise excessively during power-on stall entry
● Misunderstanding the effect of bank angle on stall speed
● Forgetting the effect of flaps, gear, weight, and CG
● Relying only on the stall warning instead of aircraft feel
● Forgetting to reconfigure and retrim after recovery
Common Misconceptions:
● “A stall means the engine stopped.”
● “An aircraft stalls only when it is too slow.”
● “If the nose is down, the aircraft cannot stall.”
● “Power fixes the stall by itself.”
● “Aileron should always be used to pick up a dropped wing.”
● “Stall warning means there is still plenty of time.”
● “Stall speed is always one fixed number.”
● “Aft centre of gravity is useful because it lowers stall speed.”
● “Flaps eliminate stall risk.”
● “A stall during a turn is just like a wings-level stall.”
● “Departure stalls only happen to careless pilots.”
● “Manoeuvring speed means the aircraft cannot stall.”
Frequently Asked Questions:
● What is an aerodynamic stall?
● Why does a wing stall?
● What is critical angle of attack?
● Can an aircraft stall at any airspeed?
● Can an aircraft stall nose-down?
● What is the difference between airspeed and angle of attack?
● Why does stall speed increase in a turn?
● How do weight and centre of gravity affect stall speed?
● How do flaps affect stall speed?
● What are the symptoms of an approaching stall?
● What is an imminent stall?
● What is the first action in stall recovery?
● Why do we reduce angle of attack before anything else?
● Why does power-on stall recovery need strong rudder awareness?
● Why are departure stalls dangerous?
● What causes a secondary stall?
● How are stalls related to spins?
Instructor Emphasis: Emphasize that a stall is an angle-of-attack problem, not simply an airspeed problem. Recovery begins by reducing angle of attack. Power, rudder, aileron, trim, and flap management are supporting actions. Students must recognize symptoms early and recover smoothly before the stall becomes more developed.

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OPERATIONAL CONTEXT

Operational Link: Stall knowledge is essential during takeoff, climb, approach, landing, overshoot, missed approach, steep turns, low-speed manoeuvring, turbulence, and emergency recovery. Stall recognition and recovery are central to loss-of-control prevention.
Real-World Applications:
● Takeoff and initial climb safety
● Departure stall prevention
● Approach-to-stall recognition
● Overshoot / go-around safety
● Missed approach handling
● Steep turn awareness
● Low-speed turn coordination
● Turbulence and gust management
● Short-field and soft-field operations
● Slow flight control
● Approach and landing stability
● Stall/spin awareness
● Emergency manoeuvring
● Recovery from improper pitch attitudes
● Avoiding secondary stalls
Related Aircraft Systems:
● Wings / aerofoil
● Ailerons
● Elevator
● Rudder
● Trim system
● Flap system
● Landing gear, if retractable
● Powerplant
● Propeller
● Stall warning system
● Airspeed indicator
● Angle-of-attack indicator, if equipped
● Tachometer / RPM indicator
● Manifold pressure gauge, if equipped
● Engine controls
● Flight control system
Related Human Factors:
● Startle effect
● Fear response
● Delayed correction
● Over-control
● Fixation on airspeed
● Fixation on pitch attitude
● Failure to reduce angle of attack
● Poor rudder discipline
● Low-altitude decision pressure
● Workload saturation
● Confirmation bias
● Loss of situational awareness
● Panic pull-back response
● Overreliance on stall warning devices
● Misinterpretation of aircraft cues
Related Regulations: Stall training must comply with current Transport Canada training requirements, aircraft operating limitations, POH / AFM procedures, flight school SOPs, and safe-altitude / airspace requirements.
Related Flight Test Standards: Supports Transport Canada flight test preparation for stall recognition, stall recovery, slow flight, aircraft control, coordinated use of flight controls, altitude-loss management, and recovery to safe flight. Exact performance standards and tolerances should be verified against the current Transport Canada flight test guide and school procedures.

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KNOWLEDGE RELATIONSHIPS

Previous Lesson: LS-PT-AE-011-001 — Air Exercise 11 — Slow Flight
Current Lesson: LS-PT-AE-012-001 — Air Exercise 12 — Stalls
Next Lesson: LS-PT-AE-013-001 — Air Exercise 13 — Spinning / Spin Awareness
Parent Concepts:
● Aircraft Control
● Low-Speed Flight
● Stall Prevention
● Loss-of-Control Prevention
● Aircraft Performance
● Basic Aerodynamics
● Primary Flight Training
● Energy Management
Child Concepts:
● Critical angle of attack
● Relative airflow
● Airflow separation
● Stall speed
● Stalling speed factors
● Imminent stall
● Full stall
● Power-off stall
● Power-on stall
● Accelerated stall
● Stall during turns
● Departure stall
● Wing drop
● Autorotation
● Secondary stall
● Stall recovery
● Stall warning
● Buffet
● Load factor
● Flap effects
● Centre of gravity effects
● Density altitude effects
● Turbulence and gust effects
● Coordinated recovery
● Rudder control during stall recovery
Sibling Concepts:
● Slow Flight
● Spinning / Spin Awareness
● Turns
● Climbing
● Descending
● Flight for Range and Endurance
● Takeoffs
● Landings
● Overshoots
● Forced Approaches
Supports:
● Air Exercise 13 — Spinning / Spin Awareness
● Takeoff safety
● Landing safety
● Overshoot / go-around technique
● Short-field operations
● Soft-field operations
● Steep turns
● Forced approaches
● Precautionary landings
● Unusual attitude recovery
● Loss-of-control prevention
● Stall/spin accident prevention
● Operational decision-making near the ground
Supported By:
● Air Exercise 5 — Attitudes and Movements
● Air Exercise 6 — Straight-and-Level Flight
● Air Exercise 7 — Climbing
● Air Exercise 8 — Descending
● Air Exercise 9 — Turns
● Air Exercise 10 — Flight for Range and Endurance
● Air Exercise 11 — Slow Flight
● Basic lift and drag theory
● Basic control coordination
● Basic power and attitude relationship
Related Lessons:
● LS-PT-AE-005-001 — Attitudes and Movements
● LS-PT-AE-006-001 — Straight-and-Level Flight
● LS-PT-AE-007-001 — Climbing
● LS-PT-AE-008-001 — Descending
● LS-PT-AE-009-001 — Turns
● LS-PT-AE-010-001 — Flight for Range and Endurance
● LS-PT-AE-011-001 — Slow Flight
● LS-PT-AE-013-001 — Spinning / Spin Awareness
● LS-PT-AE-016-001 — Forced Approaches
● LS-PT-AE-TKOF-001 — Takeoffs, if developed later
● LS-PT-AE-LDG-001 — Landings, if developed later
● LS-PT-AE-OS-001 — Overshoots, if developed later
Related Weather Topics:
● Turbulence
● Gusts
● Wind shear
● Density altitude
● High temperature
● Mountain wave
● Mechanical turbulence
● Low-level wind effects
● Crosswind
● Wind gradient
● Convective turbulence
● Icing / frost contamination
Related Navigation Topics:
● Low-level manoeuvring awareness
● Circuit awareness
● Approach path management
● Overshoot decision-making
● Diversion decision-making
● Terrain clearance
● Obstacle clearance
● Groundspeed awareness during high density altitude
Related Human Factors:
● Startle effect
● Panic pull response
● Fixation
● Delayed recovery
● Over-control
● Inadequate lookout
● Low-altitude pressure
● Task saturation
● Fear of lowering the nose
● Misreading symptoms
● Overconfidence after slow flight
● Poor transfer of control
● Instructor-student communication during demonstrations
Related Emergencies:
● Imminent stall
● Full stall
● Wing drop
● Spin entry
● Departure stall
● Overshoot stall
● Low-speed loss of control
● Engine failure after takeoff, related risk context
● Unstable approach
● Misjudged landing recovery
● Wake turbulence upset, related risk context
● Turbulence-induced stall
● Secondary stall
Related Articles: TBD
Related Diagrams:
● DIA-PT-AE-012-001 — Angles of Attack and Airflow Separation
● DIA-PT-AE-012-002 — Recovery from an Imminent Stall
● DIA-PT-AE-012-003 — Improper Stall Entry from Cruise
● DIA-PT-AE-012-004 — Full Stall Recovery
● DIA-PT-AE-012-005 — Coordinated Rudder and Aileron Control During Stall Recovery
● DIA-PT-AE-012-006 — Departure Stall Sequence
Related Illustrations:
● ILL-PT-AE-012-001 — Wing Airflow Before and During Stall
● ILL-PT-AE-012-002 — Critical Angle of Attack
● ILL-PT-AE-012-003 — Stall Symptoms
● ILL-PT-AE-012-004 — Power-Off Stall Entry
● ILL-PT-AE-012-005 — Power-On Stall Entry
● ILL-PT-AE-012-006 — Turning Stall Risk
● ILL-PT-AE-012-007 — Departure Stall Risk
● ILL-PT-AE-012-008 — Secondary Stall Prevention
Related Infographics:
● INF-PT-AE-012-001 — Air Exercise 12 Hero Image
● INF-PT-AE-012-002 — Stall = Critical Angle of Attack
● INF-PT-AE-012-003 — Stall Symptoms
● INF-PT-AE-012-004 — Factors That Change Stall Speed
● INF-PT-AE-012-005 — Stall Recovery Sequence
● INF-PT-AE-012-006 — Power-Off vs Power-On Stall
● INF-PT-AE-012-007 — Departure Stall Risk
● INF-PT-AE-012-008 — Accelerated Stall and Load Factor
Related Videos:
● VID-PT-AE-012-001 — Stall Theory Explained
● VID-PT-AE-012-002 — Imminent Stall Recognition
● VID-PT-AE-012-003 — Power-Off Stall Recovery
● VID-PT-AE-012-004 — Power-On Stall Recovery
● VID-PT-AE-012-005 — Departure Stall Awareness
● VID-PT-AE-012-006 — Accelerated Stalls and Turning Stalls
Related Animations:
● ANI-PT-AE-012-001 — Airflow Separation Over a Wing
● ANI-PT-AE-012-002 — Angle of Attack vs Aircraft Attitude
● ANI-PT-AE-012-003 — Stall Recovery: Reduce AOA First
● ANI-PT-AE-012-004 — Wing Drop and Autorotation
● ANI-PT-AE-012-005 — Load Factor Increasing Stall Speed
● ANI-PT-AE-012-006 — Departure Stall Sequence
Related Worksheets:
● WS-PT-AE-012-001 — Stall Recognition Worksheet
● WS-PT-AE-012-002 — Stall Speed Factors Worksheet
● WS-PT-AE-012-003 — Stall Recovery Scenario Worksheet
● WS-PT-AE-012-004 — Power-Off vs Power-On Stall Comparison
● WS-PT-AE-012-005 — Turning Stall and Departure Stall Risk Worksheet
Related Checklists:
● CL-PT-AE-012-001 — Stall Practice Safety Setup Checklist
● CL-PT-AE-012-002 — Imminent Stall Recovery Checklist
● CL-PT-AE-012-003 — Full Stall Recovery Checklist
● CL-PT-AE-012-004 — Power-Off Stall Setup Checklist
● CL-PT-AE-012-005 — Power-On Stall Setup Checklist
● CL-PT-AE-012-006 — Departure Stall Prevention Checklist
Related Quizzes:
● QZ-PT-AE-012-001 — Stall Theory Knowledge Check
● QZ-PT-AE-012-002 — Stall Symptoms Quiz
● QZ-PT-AE-012-003 — Stall Speed Factors Quiz
● QZ-PT-AE-012-004 — Stall Recovery Quiz
● QZ-PT-AE-012-005 — Departure and Turning Stall Quiz
Related Downloads:
● DL-PT-AE-012-001 — Stall Student Briefing Card
● DL-PT-AE-012-002 — Stall Recovery Reference Sheet
● DL-PT-AE-012-003 — Factors Affecting Stall Speed Guide
● DL-PT-AE-012-004 — Stall Symptoms Reference Card
● DL-PT-AE-012-005 — Instructor Stall Briefing Sheet
Related Glossary Terms:
● GL-PT-STALL
● GL-PT-AERODYNAMIC-STALL
● GL-PT-CRITICAL-ANGLE-OF-ATTACK
● GL-PT-ANGLE-OF-ATTACK
● GL-PT-RELATIVE-AIRFLOW
● GL-PT-AIRFLOW-SEPARATION
● GL-PT-STALL-SPEED
● GL-PT-IMMINENT-STALL
● GL-PT-FULL-STALL
● GL-PT-POWER-OFF-STALL
● GL-PT-POWER-ON-STALL
● GL-PT-ACCELERATED-STALL
● GL-PT-DEPARTURE-STALL
● GL-PT-TURNING-STALL
● GL-PT-WING-DROP
● GL-PT-AUTOROTATION
● GL-PT-SPIN-ENTRY
● GL-PT-LOAD-FACTOR
● GL-PT-CENTRE-OF-GRAVITY
● GL-PT-STALL-WARNING
● GL-PT-BUFFET
● GL-PT-SECONDARY-STALL
● GL-PT-RUDDER-COORDINATION

⸻

CAUSE & EFFECT

Cause-and-Effect Relationships:
● If angle of attack exceeds the critical angle, the wing stalls.
● If airflow separates from the wing, lift decreases and drag increases.
● If lift decreases below what is required, the aircraft may sink or the nose may drop.
● If the pilot pulls back during a stall, angle of attack may increase further.
● If angle of attack is reduced, airflow can reattach and the wing can fly again.
● If power is applied during recovery, altitude loss may be reduced.
● If power is applied without reducing angle of attack, the stall may continue.
● If yaw is allowed during a stall, one wing may stall more deeply than the other.
● If one wing stalls before the other, wing drop may occur.
● If yaw and wing drop are not corrected, autorotation and spin entry risk increase.
● If aircraft weight increases, stall speed generally increases.
● If centre of gravity moves forward, stall speed may increase and control forces may change.
● If centre of gravity moves too far aft, recovery characteristics may become dangerous.
● If flaps are extended, stall speed usually decreases but drag increases.
● If bank angle increases in a level coordinated turn, load factor increases.
● If load factor increases, stall speed increases.
● If the pilot pulls abruptly, load factor increases and an accelerated stall may occur.
● If turbulence abruptly changes relative airflow, angle of attack may increase suddenly.
● If density altitude is high, indicated stall speed may be similar but true airspeed and groundspeed are higher.
● If the aircraft is rotated too steeply after takeoff, acceleration may stop and departure-stall risk increases.
● If full power is applied during overshoot with nose-up trim, pitch-up tendency may increase.
● If flaps are retracted too quickly during a low-speed overshoot, sudden height loss may occur.
● If the pilot pulls up too aggressively after recovery, a secondary stall may occur.

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DISCOVERY

Discovery Keywords: stalls, aircraft stall, aerodynamic stall, Air Exercise 12, critical angle of attack, angle of attack, relative airflow, stall recovery, imminent stall, full stall, power-off stall, power-on stall, accelerated stall, departure stall, turning stall, stall symptoms, stall speed, stall warning, buffet, wing drop, autorotation, spin entry, reduce angle of attack, stall prevention, Transport Canada stall lesson
Alternative Search Phrases: why does a wing stall, how to recover from a stall, aircraft stall explained, PPL stall training, stall recovery steps, what causes a stall, critical angle of attack explained, can an aircraft stall at any airspeed, power-on stall vs power-off stall, departure stall explained, turning stall explained, accelerated stall explained, stall symptoms student pilot, stall warning horn, wing drop during stall, how bank angle affects stall speed
Abbreviations: PPL, PTR, TC, FTM, FIG, POH, AFM, IAS, CAS, TAS, AoA, CG, RPM, VFR
Common Misspellings: stalll, stals, aircraft stahl, angle of attak, angle of atack, critical angel of attack, relativ airflow, buffet misspelled as buffett, iminent stall, imminent stahl, power off stall, poweron stall, accelerated stahl, departue stall, autorotation misspelled as auto rotation
Not To Be Confused With:
● Engine failure
● Slow flight
● Spin
● Spiral dive
● Best glide
● Minimum controllable airspeed
● Manoeuvring speed
● Overspeed
● High sink rate
● Unusual attitude
● Loss of lift from wind shear alone
● Wake turbulence upset

⸻

AUTHORITY

Primary References:
● Transport Canada Flight Training Manual — Air Exercise 12: Stalls
● Transport Canada Flight Instructor Guide — Air Exercise 12
● Aircraft Flight Manual / Pilot Operating Handbook for aircraft-specific stall speeds, configurations, limitations, and recovery procedures
Supporting References:
● Transport Canada Private Pilot Licence Flight Test Guide
● Transport Canada Pilot Training Record
● Transport Canada Aeronautical Information Manual, as applicable
● Flight school SOPs
● Aircraft checklists
● Instructor briefing notes
● Manufacturer operating guidance
Transport Canada References:
● Flight Training Manual
● Flight Instructor Guide
● Pilot Training Record
● Private Pilot Licence Flight Test Guide
● TC AIM, as applicable
● CARs, as applicable to aircraft operation and flight training
Aircraft References:
● POH / AFM stall speeds
● POH / AFM normal and emergency procedures
● POH / AFM limitations
● Flap operating speeds and limitations
● Stall warning system description
● Weight and balance limitations
● Centre of gravity envelope
● Takeoff and climb procedures
● Overshoot / go-around procedures
● Aircraft checklist
Regulatory References:
● Canadian Aviation Regulations applicable to flight training, aircraft operation, and aircraft limitations
● Approved aircraft operating limitations
● Flight school SOPs and training standards
Industry References:
● Aircraft manufacturer manuals
● Flight school training manuals
● Stall/spin awareness material
● Loss-of-control prevention material
● Human factors guidance on startle effect, low-altitude decision-making, and over-control

⸻

AI CONTEXT

Knowledge Node Summary: This node teaches Air Exercise 12 — Stalls. It explains why a wing stalls, how stall speed changes, how to recognize stall symptoms, and how to recover from imminent, full, power-off, power-on, accelerated, turning, and departure stalls.
Educational Purpose: To prepare early PTR student pilots to understand aerodynamic stalls as angle-of-attack events, recognize stall onset, prevent full stalls when possible, and recover smoothly using correct stall recovery priorities.
Context Window: This lesson follows Slow Flight and comes before Spinning / Spin Awareness. It uses the student’s understanding of low-speed control, drag, power, coordination, load factor, and aircraft configuration to build safe stall recognition and recovery habits.
AI Retrieval Context: Air Exercise 12 — Stalls is a Canadian PPL early PTR flight training lesson in the Pilot Training domain. It teaches student pilots that a stall occurs when the wing exceeds the critical angle of attack, not simply when the aircraft is slow. The lesson covers airflow separation, relative airflow, stall speed factors, weight, centre of gravity, power, flaps, pitch, angle of bank, aircraft condition, landing gear, density altitude, stall symptoms, imminent stall recovery, power-off stall recovery, full stall recovery, power-on stall recovery, accelerated stalls, stalls during turns, departure stalls, overshoot stall risk, wing drop, autorotation, and stall/spin prevention.
Related Knowledge Families:
● Slow Flight
● Spinning / Spin Awareness
● Low-Speed Flight
● Aircraft Control
● Loss-of-Control Prevention
● Energy Management
● Turns
● Takeoffs
● Landings
● Overshoots
● Aircraft Performance
● Human Factors
Retrieval Priority: Core
AI Confidence Notes: Core aerodynamic principles are stable. Aircraft-specific stall speeds, flap settings, configurations, entry methods, and recovery procedures must be verified against the applicable POH / AFM and current flight school procedures. Flight test tolerances and regulatory expectations should be checked against current Transport Canada references before publication or operational use.

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TEACHING FRAMEWORK

Teach As: “A stall is an angle-of-attack problem.”
Mental Model: The learner should think of the wing as reaching a limit. Below the critical angle of attack, airflow can stay attached and the wing can produce lift. Beyond the critical angle, airflow separates, lift decreases, drag increases, and recovery requires reducing angle of attack before rebuilding the flight path.
Decision Rule: If stall symptoms appear: reduce angle of attack first, apply appropriate power, coordinate with rudder and aileron, regain flying speed, and return to stabilized flight.
Memory Aid: AOA — POWER — COORDINATE — RECOVER
Meaning:
● AOA: Reduce angle of attack.
● Power: Apply appropriate power.
● Coordinate: Stop yaw and keep the aircraft coordinated.
● Recover: Return to normal attitude, airspeed, and flight path.
Instructor Notes: Do not let the student memorize stall recovery as “power and pull.” The first priority is reducing angle of attack. Power helps but does not unstall the wing by itself. Emphasize early recognition, smooth control inputs, rudder coordination, and avoiding secondary stalls. Departure stalls and turning stalls deserve special caution because they are linked to low-altitude loss-of-control accidents.

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VERSION CONTROL

Version: 1.0
Author: Normand Bidal / Albatross Pilot Pathway
Technical Reviewer: Pending
Educational Reviewer: Pending
Date Created: 2026-07-07
Last Updated: 2026-07-07
Review Frequency: Annual / when Transport Canada references, POH / AFM data, school SOPs, or course structure change
Next Review Date: 2027-07-07

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