# HI.XI.M — Antitorque System Failure — Flight Instructor Rotorcraft ACS

> HI.XI.M from FAA-S-ACS-29, including the official objective, references, notes, and 10 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/rotorcraft/flight-instructor/hi-xi-m](https://www.check-ride.ai/acs/rotorcraft/flight-instructor/hi-xi-m)

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

## Official Task context

- FAA document: Flight Instructor for Rotorcraft Category Helicopter Rating Airman Certification Standards
- Identifier: FAA-S-ACS-29
- Published source date: November 2023
- Aircraft category: Rotorcraft
- Certificate or rating: Flight Instructor
- Area of Operation: Area of Operation XI. Emergency Operations
- Task: Task M. Antitorque System Failure
- Task code prefix: HI.XI.M
- Official references: FAA-H-8083-2, FAA-H-8083-4, FAA-H-8083-9, FAA-H-8083-21, FAA-H-8083-25; POH/RFM
- FAA source library: https://www.faa.gov/training_testing/testing/acs

## Official Task objective

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

## Knowledge elements

- **HI.XI.M.K1** — Elements related to antitorque system failure by describing:
- **HI.XI.M.K1a** — a. Indications of an antitorque system failure(s)
- **HI.XI.M.K1b** — b. Differences between complete loss of antitorque and mechanical flight control failures
- **HI.XI.M.K1c** — c. RFM procedures for antitorque system(s) failure
- **HI.XI.M.K2** — Wind conditions that favor a landing with an antitorque failure.
- **HI.XI.M.K3** — Common errors related to this Task.

## Risk management elements

- **HI.XI.M.R1** — Preflight inspection of the antitorque system.
- **HI.XI.M.R2** — Antitorque failure(s) for the aircraft supplied for the practical test.
- **HI.XI.M.R3** — Use of antitorque failure procedures.

## Skills elements

- **HI.XI.M.S1** — [Intentionally left blank].

## 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

- Evaluator assesses this Task orally only.

## 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.