# CA.IX.C — Systems and Equipment Malfunctions — Commercial Pilot Airplane ACS

> CA.IX.C from FAA-S-ACS-7B, including the official objective, references, notes, and 21 exact knowledge, risk-management, and skill descriptions.

Canonical HTML: [https://www.check-ride.ai/acs/airplane/commercial-pilot/ca-ix-c](https://www.check-ride.ai/acs/airplane/commercial-pilot/ca-ix-c)

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

## Official Task context

- FAA document: Commercial Pilot for Airplane Category Airman Certification Standards
- Identifier: FAA-S-ACS-7B
- Published source date: November 2023
- Aircraft category: Airplane
- Certificate or rating: Commercial Pilot
- Area of Operation: Area of Operation IX. Emergency Operations
- Task: Task C. Systems and Equipment Malfunctions
- Task code prefix: CA.IX.C
- Official references: FAA-H-8083-2, FAA-H-8083-3, FAA-H-8083-25; POH/AFM
- 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 system and equipment malfunctions appropriate to the airplane provided for the practical test.

## Knowledge elements

- **CA.IX.C.K1** — Causes of partial or complete power loss related to the specific type of powerplant(s).
- **CA.IX.C.K1a** — a. [Archived]
- **CA.IX.C.K1b** — b. [Archived]
- **CA.IX.C.K1c** — c. [Archived]
- **CA.IX.C.K1d** — d. [Archived]
- **CA.IX.C.K2** — System and equipment malfunctions specific to the aircraft, including:
- **CA.IX.C.K2a** — a. Electrical malfunction
- **CA.IX.C.K2b** — b. Vacuum/pressure and associated flight instrument malfunctions
- **CA.IX.C.K2c** — c. Pitot-static system malfunction
- **CA.IX.C.K2d** — d. Electronic flight deck display malfunction
- **CA.IX.C.K2e** — e. Landing gear or flap malfunction
- **CA.IX.C.K2f** — f. Inoperative trim
- **CA.IX.C.K3** — Causes and remedies for smoke or fire onboard the aircraft.
- **CA.IX.C.K4** — Any other system specific to the aircraft (e.g., supplemental oxygen, deicing).
- **CA.IX.C.K5** — Inadvertent door or window opening.

## Risk management elements

- **CA.IX.C.R1** — Checklist usage for a system or equipment malfunction.
- **CA.IX.C.R2** — Distractions, task prioritization, loss of situational awareness, or disorientation.
- **CA.IX.C.R3** — Undesired aircraft state.
- **CA.IX.C.R4** — Startle response.

## Skills elements

- **CA.IX.C.S1** — Determine appropriate action for simulated emergencies specified by the evaluator, from at least three of the elements or sub-elements listed in K1 through K5.
- **CA.IX.C.S2** — Complete the appropriate checklist(s).

## 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.