# AI.IX.D — Lazy Eights (ASEL, ASES) — Flight Instructor Airplane ACS

> AI.IX.D from FAA-S-ACS-25, including the official objective, references, notes, and 24 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/airplane/flight-instructor/ai-ix-d](https://www.check-ride.ai/acs/airplane/flight-instructor/ai-ix-d)

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

## Official Task context

- FAA document: Flight Instructor for Airplane Category Airman Certification Standards
- Identifier: FAA-S-ACS-25
- Published source date: November 2023
- Aircraft category: Airplane
- Certificate or rating: Flight Instructor
- Area of Operation: Area of Operation IX. Performance and Ground Reference Maneuvers
- Task: Task D. Lazy Eights (ASEL, ASES)
- Task code prefix: AI.IX.D
- Official references: FAA-H-8083-2, FAA-H-8083-3, FAA-H-8083-9, FAA-H-8083-25; POH/AFM
- FAA source library: https://www.faa.gov/training_testing/testing/acs

## Official Task objective

To determine the applicant understands lazy eights, can apply that knowledge, manage associated risks, demonstrate appropriate skills, and provide effective instruction.

## Knowledge elements

- **AI.IX.D.K1** — Purpose of and procedures for lazy eights.
- **AI.IX.D.K2** — Aerodynamics associated with lazy eights, including how to maintain coordinated flight.
- **AI.IX.D.K3** — Performance and airspeed limitations.
- **AI.IX.D.K4** — Phases of the lazy eight maneuver from entry to recovery.
- **AI.IX.D.K5** — Common errors related to this Task.

## Risk management elements

- **AI.IX.D.R1** — Division of attention between aircraft control and orientation.
- **AI.IX.D.R2** — Collision hazards.
- **AI.IX.D.R3** — Low altitude maneuvering, including stall, spin, or controlled flight into terrain (CFIT).
- **AI.IX.D.R4** — Distractions, task prioritization, loss of situational awareness, or disorientation.
- **AI.IX.D.R5** — Uncoordinated flight.
- **AI.IX.D.R6** — Energy management.
- **AI.IX.D.R7** — Accelerated stalls.

## Skills elements

- **AI.IX.D.S1** — Clear the area.
- **AI.IX.D.S2** — Select an altitude that allows the maneuver to be performed no lower than 1,500 feet above ground level (AGL).
- **AI.IX.D.S3** — Establish the recommended entry configuration, power, and airspeed.
- **AI.IX.D.S4** — Maintain coordinated flight throughout the maneuver.
- **AI.IX.D.S5** — Complete the maneuver in accordance with the following:
- **AI.IX.D.S5a** — a. Approximately 30° bank at the steepest point
- **AI.IX.D.S5b** — b. Constant change of pitch and roll rate and airspeed
- **AI.IX.D.S5c** — c. Altitude at 180° point, ±100 feet from entry altitude
- **AI.IX.D.S5d** — d. Airspeed at the 180° point, ±10 knots from entry airspeed
- **AI.IX.D.S5e** — e. Heading at the 180° point, ±10°
- **AI.IX.D.S6** — Continue the maneuver through the number of symmetrical loops specified, then resume straight-andlevel flight.
- **AI.IX.D.S7** — 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.

## 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.