# AI.XIII.A — Maneuvering with One Engine Inoperative (AMEL, AMES) — Flight Instructor Airplane ACS

> AI.XIII.A from FAA-S-ACS-25, including the official objective, references, notes, and 20 exact knowledge, risk-management, and skill descriptions.

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

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 XIII. Multiengine Operations
- Task: Task A. Maneuvering with One Engine Inoperative (AMEL, AMES)
- Task code prefix: AI.XIII.A
- Official references: FAA-H-8083-2, FAA-H-8083-3, FAA-H-8083-9, FAA-H-8083-25; FAA-P-8740-66; POH/AFM
- FAA source library: https://www.faa.gov/training_testing/testing/acs

## Official Task objective

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

## Knowledge elements

- **AI.XIII.A.K1** — Factors affecting minimum controllable speed (VMC).
- **AI.XIII.A.K2** — VMC (red line) and best single-engine rate of climb airspeed (VYSE) (blue line).
- **AI.XIII.A.K3** — How to identify, verify, feather, and secure an inoperative engine.
- **AI.XIII.A.K4** — Importance of drag reduction, including propeller feathering, gear and flap retraction, the manufacturer’s recommended control input and its relation to zero sideslip.
- **AI.XIII.A.K5** — Feathering, securing, unfeathering, and restarting.
- **AI.XIII.A.K6** — Common errors related to this Task.

## Risk management elements

- **AI.XIII.A.R1** — Potential engine failure during flight.
- **AI.XIII.A.R2** — Collision hazards.
- **AI.XIII.A.R3** — Configuring the airplane.
- **AI.XIII.A.R4** — Low altitude maneuvering, including stall, spin, or controlled flight into terrain (CFIT).
- **AI.XIII.A.R5** — Distractions, task prioritization, loss of situational awareness, or disorientation.

## Skills elements

- **AI.XIII.A.S1** — Recognize an engine failure, maintain control, use manufacturer’s memory item procedures, and use appropriate emergency procedures.
- **AI.XIII.A.S2** — Set the engine controls, identify and verify the inoperative engine, and feather the appropriate propeller.
- **AI.XIII.A.S3** — Use flight controls in the proper combination as recommended by the manufacturer, or as required to maintain best performance, and trim as required.
- **AI.XIII.A.S4** — Attempt to determine and resolve the reason for the engine failure.
- **AI.XIII.A.S5** — Secure the inoperative engine and monitor the operating engine and make necessary adjustments.
- **AI.XIII.A.S6** — Restart the inoperative engine using manufacturer’s restart procedures.
- **AI.XIII.A.S7** — Maintain altitude ±100 feet or minimum sink rate if applicable, airspeed ±10 knots, and selected headings ±10°.
- **AI.XIII.A.S8** — Complete the appropriate checklist(s).
- **AI.XIII.A.S9** — 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.

## 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.