# CH.I.I — Night Operations — Commercial Pilot Rotorcraft ACS

> CH.I.I from FAA-S-ACS-16, including the official objective, references, notes, and 17 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/rotorcraft/commercial-pilot/ch-i-i](https://www.check-ride.ai/acs/rotorcraft/commercial-pilot/ch-i-i)

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

## Official Task context

- FAA document: Commercial Pilot for Rotorcraft Category Helicopter Rating Airman Certification Standards
- Identifier: FAA-S-ACS-16
- Published source date: November 2023
- Aircraft category: Rotorcraft
- Certificate or rating: Commercial Pilot
- Area of Operation: Area of Operation I. Preflight Preparation
- Task: Task I. Night Operations
- Task code prefix: CH.I.I
- Official references: 14 CFR part 91; AIM; 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 and risk management associated with night operations.

## Knowledge elements

- **CH.I.I.K1** — Physiological aspects of vision related to night flying.
- **CH.I.I.K2** — Personal equipment essential for night flight.
- **CH.I.I.K3** — Helicopter equipment and lighting requirements for night operations.
- **CH.I.I.K4** — Lighting systems identifying airports/heliports/helipads/landing areas, runways, taxiways and obstructions, as well as pilot controlled lighting.
- **CH.I.I.K5** — Night orientation, navigation, chart reading techniques and methods for maintaining night vision effectiveness.
- **CH.I.I.K6** — Night taxi operations.
- **CH.I.I.K7** — Interpretation of traffic position and direction based solely on position lights.
- **CH.I.I.K8** — Visual illusions at night.
- **CH.I.I.K9** — Appropriate use of automation, if applicable.

## Risk management elements

- **CH.I.I.R1** — Collision hazards.
- **CH.I.I.R2** — Runway incursion.
- **CH.I.I.R3** — Distractions, task prioritization, loss of situational awareness, or disorientation.
- **CH.I.I.R4** — Effect of visual illusions and night adaptation during all phases of night flying.
- **CH.I.I.R5** — Night currency versus proficiency.
- **CH.I.I.R6** — Weather considerations specific to night operations.
- **CH.I.I.R7** — Inoperative equipment.

## Skills elements

- **CH.I.I.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.

## 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.