# IL.XII.B — Power-Off Stalls — Flight Instructor Powered Lift ACS

> IL.XII.B from FAA-S-ACS-27, including the official objective, references, notes, and 26 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/powered-lift/flight-instructor/il-xii-b](https://www.check-ride.ai/acs/powered-lift/flight-instructor/il-xii-b)

Site reference: [https://www.check-ride.ai/llms.txt](https://www.check-ride.ai/llms.txt)

## Official Task context

- FAA document: Flight Instructor for Powered-Lift Category Airman Certification Standards
- Identifier: FAA-S-ACS-27
- Published source date: November 2023
- Aircraft category: Powered Lift
- Certificate or rating: Flight Instructor
- Area of Operation: Area of Operation XII. Slow Flight and Stalls
- Task: Task B. Power-Off Stalls
- Task code prefix: IL.XII.B
- Official references: AC 61-67; FAA-H-8083-2, FAA-H-8083-9, FAA-H-8083-25; Flight Manual
- FAA source library: https://www.faa.gov/training_testing/testing/acs

## Official Task objective

To determine the applicant understands power-off stalls, can apply that knowledge, manage associated risks, demonstrate appropriate skills, and provide effective instruction.

## Knowledge elements

- **IL.XII.B.K1** — Purpose of and procedures for power-off stalls.
- **IL.XII.B.K2** — Aerodynamics associated with stalls in various aircraft configurations, including the relationship between angle of attack, airspeed, load factor, power setting, aircraft weight and center of gravity, aircraft attitude, and yaw effects.
- **IL.XII.B.K3** — Stall characteristics as they relate to aircraft design, and recognition impending stall and full stall indications using sight, sound, or feel.
- **IL.XII.B.K4** — Factors and situations that can lead to a power-off stall and actions that can be taken to prevent it.
- **IL.XII.B.K5** — Fundamentals of stall recovery.
- **IL.XII.B.K6** — Common errors related to this Task.

## Risk management elements

- **IL.XII.B.R1** — Factors and situations that could lead to an inadvertent power-off stall, spin, and loss of control.
- **IL.XII.B.R2** — Range and limitations of stall warning indicators (e.g., aircraft buffet, stall horn, etc.).
- **IL.XII.B.R3** — Stall warning(s) during normal operations.
- **IL.XII.B.R4** — Stall recovery procedure.
- **IL.XII.B.R5** — Secondary and accelerated stalls.
- **IL.XII.B.R6** — Effect of environmental elements on aircraft performance related to power-off stalls (e.g., turbulence, microbursts, and high-density altitude).
- **IL.XII.B.R7** — Collision hazards.
- **IL.XII.B.R8** — Distractions, task prioritization, loss of situational awareness, or disorientation.

## Skills elements

- **IL.XII.B.S1** — Clear the area.
- **IL.XII.B.S2** — Select an entry altitude that allows the Task to be completed no lower than 3,000 feet AGL or as recommended by the manufacturer, whichever is higher.
- **IL.XII.B.S3** — Configure the aircraft in the approach or landing configuration, as specified by the evaluator, and maintain coordinated flight throughout the maneuver.
- **IL.XII.B.S4** — Establish a stabilized descent.
- **IL.XII.B.S5** — Transition smoothly from the approach or landing attitude to a pitch attitude that induces a stall.
- **IL.XII.B.S6** — Maintain a specified heading, ±10° if in straight flight; maintain a specified angle of bank not to exceed 20°, ±5°, if in turning flight, until an impending or full stall occurs, as specified by the evaluator.
- **IL.XII.B.S7** — Acknowledge the cues at the first indication of a stall (e.g., aircraft buffet, stall horn, etc.).
- **IL.XII.B.S8** — Recover at the first indication of a stall or after a full stall has occurred, as specified by the evaluator.
- **IL.XII.B.S9** — Configure the aircraft as recommended by the manufacturer and accelerate to VX or VY.
- **IL.XII.B.S10** — Return to the altitude, heading, and airspeed specified by the evaluator.
- **IL.XII.B.S11** — Use single-pilot resource management (SRM) or crew resource management (CRM), as appropriate.
- **IL.XII.B.S12** — Analyze and correct common errors related to this Task.

## Difficulty methodology

Difficulty calibration is ongoing for this Task. Observed difficulty is a privacy-thresholded check-ride.ai mock-oral practice proxy, not an FAA practical-test pass or fail rate. Underlying sample sizes and the private reporting threshold are not published.

## Official Task notes

- Note: See Appendix 2: Safety of Flight and Appendix 3: Aircraft, Equipment, and Operational Requirements & Limitations for information related to this Task.

## Use in practice

A mock examiner can ask a pilot to explain the published elements, apply them to the configured aircraft and airport context, identify risks, and defend a decision. Practice prompts are not represented as actual FAA examiner scripts or predictions of the questions a candidate will receive.