# PI.III.C — Instrument Flight Deck Check — Flight Instructor – Instrument Powered Lift ACS

> PI.III.C from FAA-S-ACS-28, including the official objective, references, notes, and 8 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/powered-lift/flight-instructor-instrument/pi-iii-c](https://www.check-ride.ai/acs/powered-lift/flight-instructor-instrument/pi-iii-c)

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

## Official Task context

- FAA document: Flight Instructor – Instrument Rating Powered-Lift Airman Certification Standards
- Identifier: FAA-S-ACS-28
- Published source date: November 2023
- Aircraft category: Powered Lift
- Certificate or rating: Flight Instructor – Instrument
- Area of Operation: Area of Operation III. Preflight Preparation
- Task: Task C. Instrument Flight Deck Check
- Task code prefix: PI.III.C
- Official references: 14 CFR part 91; AC 91.21-1; FAA-H-8083-2, FAA-H-8083-9, FAA-H-8083-15, FAA-H-8083-25; Flight Manual
- 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 conducting a preflight check on the aircraft’s instruments necessary for an IFR flight, and provide effective instruction.

## Knowledge elements

- **PI.III.C.K1** — Purpose of performing an instrument flight deck check and how to detect possible defects.
- **PI.III.C.K2** — IFR airworthiness, including aircraft inspection requirements and required equipment for IFR flight.
- **PI.III.C.K3** — Required procedures, documentation, and limitations of flying with inoperative equipment.
- **PI.III.C.K4** — Common errors related to this Task.

## Risk management elements

- **PI.III.C.R1** — Operating with inoperative equipment.
- **PI.III.C.R2** — Operating with outdated navigation publications or databases.

## Skills elements

- **PI.III.C.S1** — Perform preflight inspection by following the checklist appropriate to the aircraft and determine if the aircraft is in a condition for safe instrument flight.
- **PI.III.C.S2** — 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.

## 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.