# HI.XI.G — Low Rotor Revolutions Per Minute (RPM) Recognition and Recovery — Flight Instructor Rotorcraft ACS

> HI.XI.G from FAA-S-ACS-29, including the official objective, references, notes, and 17 exact knowledge, risk-management, and skill descriptions.

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

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 G. Low Rotor Revolutions Per Minute (RPM) Recognition and Recovery
- Task code prefix: HI.XI.G
- 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 low rotor rpm recognition and recovery, can apply that knowledge, manage associated risks, demonstrate appropriate skills, and provide effective instruction.

## Knowledge elements

- **HI.XI.G.K1** — Elements related to low rotor rpm recovery energy management, including the combination of conditions that may lead to this situation.
- **HI.XI.G.K2** — Effects of wind, weight, temperature, and density altitude.
- **HI.XI.G.K3** — Aerodynamics that affect low rotor rpm conditions.
- **HI.XI.G.K4** — Powerplant performance.
- **HI.XI.G.K5** — Main rotor (Nr) limitations.
- **HI.XI.G.K6** — Difference between low rotor rpm and blade stall.
- **HI.XI.G.K7** — Common errors related to this Task.

## Risk management elements

- **HI.XI.G.R1** — Powerplant limitations.
- **HI.XI.G.R2** — Powerplant governor operation.
- **HI.XI.G.R3** — Collision hazards.
- **HI.XI.G.R4** — Distractions, task prioritization, loss of situational awareness, or disorientation.
- **HI.XI.G.R5** — Low inertia rotor systems.

## Skills elements

- **HI.XI.G.S1** — Complete the appropriate checklist(s).
- **HI.XI.G.S2** — Clear the area.
- **HI.XI.G.S3** — Detect the development of low rotor rpm and initiate prompt corrective action.
- **HI.XI.G.S4** — Execute the recovery procedure to return rotor rpm to normal limits.
- **HI.XI.G.S5** — 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

- See 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.