# CA.X.C — One Engine Inoperative (Simulated) (solely by Reference to Instruments) During Straight-and-Level Flight and Turns (AMEL, AMES) — Commercial Pilot Airplane ACS

> CA.X.C from FAA-S-ACS-7B, including the official objective, references, notes, and 17 exact knowledge, risk-management, and skill descriptions.

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

## Official Task context

- FAA document: Commercial Pilot for Airplane Category Airman Certification Standards
- Identifier: FAA-S-ACS-7B
- Published source date: November 2023
- Aircraft category: Airplane
- Certificate or rating: Commercial Pilot
- Area of Operation: Area of Operation X. Multiengine Operations
- Task: Task C. One Engine Inoperative (Simulated) (solely by Reference to Instruments) During Straight-and-Level Flight and Turns (AMEL, AMES)
- Task code prefix: CA.X.C
- Official references: FAA-H-8083-2, FAA-H-8083-3, FAA-H-8083-15, 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 exhibits satisfactory knowledge, risk management, and skills associated with flight solely by reference to instruments with one engine inoperative.

## Knowledge elements

- **CA.X.C.K1** — Procedures used if engine failure occurs during straight-and-level flight and turns while on instruments.

## Risk management elements

- **CA.X.C.R1** — Identification of the inoperative engine.
- **CA.X.C.R2** — Inability to climb or maintain altitude with an inoperative engine.
- **CA.X.C.R3** — Low altitude maneuvering, including stall, spin, or controlled flight into terrain (CFIT).
- **CA.X.C.R4** — Distractions, task prioritization, loss of situational awareness, or disorientation.
- **CA.X.C.R5** — Fuel management during single-engine operation.

## Skills elements

- **CA.X.C.S1** — Promptly recognize an engine failure and maintain positive aircraft control.
- **CA.X.C.S2** — Set the engine controls, reduce drag, identify and verify the inoperative engine, and simulate feathering of the propeller on the inoperative engine (evaluator should then establish zero thrust on the inoperative engine).
- **CA.X.C.S3** — Establish the best engine-inoperative airspeed and trim the airplane.
- **CA.X.C.S4** — Use flight controls in the proper combination as recommended by the manufacturer, or as required to maintain best performance, and trim as required.
- **CA.X.C.S5** — Verify the prescribed checklist procedures used for securing the inoperative engine.
- **CA.X.C.S6** — Attempt to determine and resolve the reason for the engine failure.
- **CA.X.C.S7** — Monitor engine functions and make necessary adjustments.
- **CA.X.C.S8** — Maintain the specified altitude ±100 feet or minimum sink rate if applicable, airspeed ±10 knots, and the specified heading ±10°.
- **CA.X.C.S9** — Assess the aircraft’s performance capability and decide an appropriate action to ensure a safe landing.
- **CA.X.C.S10** — Avoid loss of airplane control or attempted flight contrary to the engine-inoperative operating limitations of the airplane.
- **CA.X.C.S11** — Use single-pilot resource management (SRM) or crew resource management (CRM), as appropriate.

## 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

- 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.