Approach-to-Stall vs. Full Stall: Updated Recovery Standards for ATP

One of the most significant shifts in airline training doctrine over the past decade concerns how pilots are taught to recognize and recover from stalls. Advisory Circular 120-109A, Stall Prevention and Recovery Training, replaced earlier guidance and fundamentally redefined what constitutes an acceptable stall recovery in transport-category aircraft. For ATP candidates, understanding the distinction between an approach-to-stall and a full stall — and applying the correct recovery technique for each — is not merely a written-test requirement. It is a core airmanship competency that examiners will evaluate in the simulator and during oral questioning.

The revised standards emerged largely in response to accident investigations, most notably events where crews applied outdated back-pressure techniques or failed to reduce angle of attack (AOA) aggressively enough, resulting in departures from controlled flight. AC 120-109A anchors the training philosophy in aerodynamic first principles rather than procedure-following, requiring pilots to internalize why the recovery actions work, not just what they are.

Defining the Two Regimes

The FAA draws a clear line between two distinct stall-related events, and the definitions matter because the recovery cues — and the acceptable responses — differ between them.

An approach to stall (also called an impending stall) is a condition in which the aircraft is approaching the critical angle of attack but has not yet reached it. The crew receives stall warning — typically from the stick shaker or an aural/tactile cue — but the wing is still generating lift in a controllable regime. The aircraft has not yet experienced the abrupt lift breakdown that defines a full aerodynamic stall. This is where the vast majority of real-world transport events occur and where the greatest training emphasis is placed.

A full stall occurs when the wing exceeds the critical angle of attack and lift collapses. In many swept-wing transport aircraft, this is accompanied by a stick pusher activation (where installed), buffet beyond the warning threshold, and potentially the onset of roll-off or pitch departure. Recovery from a full stall involves the same fundamental actions as an approach-to-stall recovery but may require more aggressive nose-lowering inputs to break the stall, and the sequencing of those inputs becomes even more critical.

The Recovery Technique: AC 120-109A Standards

The core recovery procedure endorsed by AC 120-109A is built around a single aerodynamic imperative: reduce angle of attack first. Every other action is subordinate to this step. The guidance describes the recovery in the following sequence:

1. Disconnect autopilot and autothrottle — Automated systems may be commanding or masking the condition. Manual control is required to execute a proper recovery and to feel the aircraft's actual state.
2. Apply nose-down pitch control — The pilot must positively reduce angle of attack by moving the control column or sidestick forward. This is the non-negotiable first aerodynamic action. The magnitude of input depends on proximity to the critical AOA; in a full stall, the input may need to be aggressive.
3. Apply appropriate thrust — Thrust is advanced as needed, but AC 120-109A explicitly cautions that thrust alone does not recover from a stall. Thrust reduces the rate of descent and improves energy, but it does not reduce angle of attack. On some aircraft, high thrust at high AOA can introduce significant pitch-up moment (especially with engines mounted below the wing's center of lift), which can worsen the condition if back-pressure is simultaneously held.
4. Level the wings — Once AOA is reduced below the critical threshold, the pilot should roll wings level using coordinated aileron and rudder. Attempting to roll while the wing is stalled risks aggravating the departure or inducing a spin entry in some configurations.
5. Return to the desired flight path — The final step is recovering altitude and returning to the cleared or desired flight path, using a smooth pull-up that does not re-approach the critical AOA.

The Altitude-Loss Prohibition

Perhaps the single most important doctrinal change in AC 120-109A is the explicit elimination of minimum altitude loss as a training standard or performance criterion. Under older guidance, instructors sometimes graded recoveries based on how little altitude the aircraft lost. This created a perverse training incentive: pilots learned to arrest the nose-down recovery pitch quickly and pull back aggressively to minimize altitude loss, which could re-stall the aircraft or prevent the AOA from being fully reduced.

AC 120-109A states clearly that the goal of stall recovery training is to instill proper technique, and that altitude loss during the recovery is an expected and acceptable consequence of correctly reducing angle of attack. Examiners and instructors are directed not to penalize pilots for altitude loss that results from a correct recovery. Conversely, a recovery that looks altitude-efficient but used back-pressure to limit pitch-down may be an unsafe technique even if it appears visually clean.

Stick Pusher Considerations

Transport-category aircraft certified under certain regulations may be equipped with a stick pusher — an automatic system that applies a nose-down force when the aircraft approaches the critical AOA. AC 120-109A addresses stick pusher training directly. Pilots must be trained to recognize the stick pusher activation, understand that it is designed to assist AOA reduction (not replace it), and know how to respond if the pusher fires inadvertently. Importantly, overriding or defeating a stick pusher activation during an actual stall approach is considered a serious error, as it removes the primary protection against full stall departure.

Why It Matters: Operational and Safety Relevance

Stall-related loss of control inflight (LOC-I) is consistently cited among the leading causes of fatal airline accidents worldwide. The Airline Safety and Federal Aviation Administration Extension Act of 2010 led to FAA rulemaking primarily under 14 CFR Part 121 Subparts N and O (and related Advanced Qualification Program provisions in Part 121 Appendix F and 14 CFR 121.409), culminating in the 2013 final rule on stall and upset recovery training (Airplane Flight Crewmember Training, Testing, and Checking Requirements). AC 120-109A provides the operational interpretation of what those recovery events must look like in training devices and line-oriented scenarios.

For the ATP candidate, this means that simulator evaluations explicitly test the ability to disconnect automation, push forward on the controls despite strong psychological resistance (the instinct to pull when the aircraft is descending is powerful), and tolerate altitude loss as the price of a correct recovery. Failure to reduce AOA promptly — regardless of how smoothly the aircraft returns to level flight — is a failing technique under current standards.

Key Numbers and Rules

• Critical AOA — The angle at which the wing stalls; numerically aircraft-specific but aerodynamically universal. Recovery requires getting below this angle regardless of airspeed, configuration, or altitude.
• Stick shaker activation — Set to trigger at a margin above the critical AOA that is aircraft-specific; FAA guidance does not codify a universal numeric percentage. It provides a warning margin before the actual stall and is the approach-to-stall cue.
• Stick pusher activation — Occurs at or near the critical AOA, functioning as a last-resort automatic protection to prevent the wing from exceeding it; the precise relationship to stick shaker activation is aircraft-specific rather than a fixed universal margin.
• No minimum altitude loss criterion — AC 120-109A eliminates altitude-loss grading. Recovery correctness is judged on technique, not altitude saved.
• Autopilot disconnect — Required as the first procedural step; automation must not be allowed to fight the recovery inputs.
• Thrust alone is insufficient — Advancing thrust without reducing AOA does not recover from a stall and may worsen pitch-up tendency on under-wing-mounted engine aircraft.

Common Test Traps

• Confusing the order of recovery steps. Some candidates memorize thrust as the first action. AC 120-109A is unambiguous: AOA reduction via nose-down pitch input comes first aerodynamically; autopilot disconnect comes first procedurally. Thrust is a concurrent or subsequent action.
• Stating that altitude loss must be minimized. This is the hallmark of pre-AC 120-109A training philosophy. On any written or oral examination, answer that altitude loss is acceptable and expected in a correct recovery.
• Failing to distinguish approach-to-stall from full stall. The recovery technique is the same in principle, but a full stall may require more aggressive nose-down input and may involve stick pusher activation. Know both definitions and be able to state the difference.
• Assuming a stick pusher should be overridden. A common trap question asks what to do when the stick pusher fires. The correct answer is to allow it and support the nose-down input, not to override it (except in specific abnormal pusher malfunction checklists).
• Neglecting to level the wings before the pull-up. Rolling while in a stalled or near-stalled condition risks aggravating the departure. Wings-level must precede the recovery pull-up to safe flight path.