# PH.IV.D — Taxiing with Wheel-Type Landing Gear — Private Pilot Rotorcraft ACS

> PH.IV.D from FAA-S-ACS-15, including the official objective, references, notes, and 25 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/rotorcraft/private-pilot/ph-iv-d](https://www.check-ride.ai/acs/rotorcraft/private-pilot/ph-iv-d)

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

## Official Task context

- FAA document: Private Pilot for Rotorcraft Category Helicopter Rating Airman Certification Standards
- Identifier: FAA-S-ACS-15
- Published source date: November 2023
- Aircraft category: Rotorcraft
- Certificate or rating: Private Pilot
- Area of Operation: Area of Operation IV. Hovering Maneuvers
- Task: Task D. Taxiing with Wheel-Type Landing Gear
- Task code prefix: PH.IV.D
- Official references: AC 91-73; AIM; Chart Supplements; FAA-H-8083-2, 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 exhibits satisfactory knowledge, risk management, and skills associated with
ground taxi operations, in a wheel-type aircraft, including runway incursion avoidance.

## Knowledge elements

- **PH.IV.D.K1** — Current airport aeronautical references and information resources such as the Chart Supplement,
airport diagram, and Notices to Air Missions (NOTAMs).
- **PH.IV.D.K2** — Taxi instructions/clearances.
- **PH.IV.D.K3** — Airport/heliport/helipad/landing area, signs, markings, and lighting.
- **PH.IV.D.K4** — Visual indicators for wind.
- **PH.IV.D.K5** — Aircraft lighting, as appropriate.
- **PH.IV.D.K6** — Procedures for:
- **PH.IV.D.K6a** — a. Appropriate flight deck activities prior to taxi, including route planning and identifying the
location of Hot Spots
- **PH.IV.D.K6b** — b. Safe taxi at towered and nontowered airports
- **PH.IV.D.K6c** — c. Entering or crossing runways

## Risk management elements

- **PH.IV.D.R1** — Activities and distractions.
- **PH.IV.D.R2** — Confirmation or expectation bias as related to taxi instructions.
- **PH.IV.D.R3** — Runway incursion.
- **PH.IV.D.R4** — Speed during taxi and turns.
- **PH.IV.D.R5** — Appropriate thrust vector and brake use.
- **PH.IV.D.R6** — Airframe and rotor clearances during taxi.

## Skills elements

- **PH.IV.D.S1** — Complete the appropriate checklist(s).
- **PH.IV.D.S2** — Use an appropriate airport/heliport diagram or taxi chart, if published.
- **PH.IV.D.S3** — Properly position nosewheel/tailwheel, if applicable, locked or unlocked.
- **PH.IV.D.S4** — Position the flight controls properly for the existing wind conditions, with the landing gear in contact
with the surface, avoiding conditions that might lead to loss of directional control.
- **PH.IV.D.S5** — Properly use cyclic, collective, and brakes as applicable to control speed while taxiing.
- **PH.IV.D.S6** — Maintain powerplant and main rotor (Nr) speed within normal limits.
- **PH.IV.D.S7** — Maintain specified track within 4 feet.
- **PH.IV.D.S8** — Position the helicopter relative to hold lines or a specified point.
- **PH.IV.D.S9** — Receive and comply with ATC clearances/instructions, if applicable.
- **PH.IV.D.S10** — Comply with airport/heliport taxiway markings, lights, and signals.

## 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.