# PI.IX.D — Approach with Loss of Primary Flight Instrument Indicators — Flight Instructor – Instrument Powered Lift ACS

> PI.IX.D from FAA-S-ACS-28, including the official objective, references, notes, and 10 exact knowledge, risk-management, and skill descriptions.

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

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 IX. Emergency Operations
- Task: Task D. Approach with Loss of Primary Flight Instrument Indicators
- Task code prefix: PI.IX.D
- Official references: 14 CFR part 91; FAA-H-8083-2, FAA-H-8083-9, FAA-H-8083-15, FAA-H-8083-16, FAA-H-8083-25; Terminal Procedures Publications; Flight Manual
- FAA source library: https://www.faa.gov/training_testing/testing/acs

## Official Task objective

To determine the applicant understands performing an approach solely by reference to instruments with the loss of primary flight control instruments, can apply that knowledge, manage associated risks, demonstrate appropriate skills, and provide effective instruction.

## Knowledge elements

- **PI.IX.D.K1** — Recognizing if primary flight instruments are inaccurate or inoperative, and advising ATC or the evaluator.
- **PI.IX.D.K2** — Possible failure modes of primary instruments and how to correct or minimize the effect of the loss.
- **PI.IX.D.K3** — Common errors related to this Task.

## Risk management elements

- **PI.IX.D.R1** — Use of secondary flight displays when primary displays have failed.
- **PI.IX.D.R2** — Maintaining aircraft control.
- **PI.IX.D.R3** — Distractions, task prioritization, loss of situational awareness, or disorientation.

## Skills elements

- **PI.IX.D.S1** — Advise ATC or the evaluator if unable to comply with a clearance.
- **PI.IX.D.S2** — Complete a non-precision instrument approach without the use of the primary flight instruments using the skill elements of the non-precision approach Task (see Area of Operation VIII, Task A).
- **PI.IX.D.S3** — Use single-pilot resource management (SRM) or crew resource management (CRM), as appropriate.
- **PI.IX.D.S4** — 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.