Airworthiness Directives; BRP-Rotax GmbH & Co KG (Formerly BRP-POWERTRAIN GMBH & CO KG and Bombardier-Rotax GmbH) Engines

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register March 4, 2026. Document 2026-04280. Updated Nov. 14, 2026.

What it does

The FAA is adopting a new airworthiness directive (AD) for all BRP-Rotax GmbH & Co KG (Rotax) Model 915 iSc2 C24 and 915 iSc3 C24 engines. This AD was prompted by a report of a certain collar nut that was not installed on the propeller gearbox. This AD requires a visual inspection of the propeller gearbox to determine if a collar nut is installed on the propeller shaft and, if not installed, replacement of the propeller gearbox with a serviceable propeller gearbox. The FAA is issuing this AD to address the unsafe condition on these products.

The Federal Aviation Administration's summary, as published in the Federal Register.

What changed in the regulation

1 part of Title 14 of the Code of Federal Regulations:

14 CFR 39

Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).

Compared with

The Federal Aviation Administration has published 489 final rules in 2026 so far, compared with 518 in all of 2025.

Counted by the Tribune from Federal Register records since Jan. 1, 2025.

Before this

673 earlier Federal Register documents under regulation identifier 2120-AA64 since Jan. 1, 2025.

Since then:

What happens next and when

This AD is effective March 19, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-04280
Action	Final rule; request for comments.
Agencies	Transportation Department; Federal Aviation Administration
Published	March 4, 2026
Effective date	March 19, 2026
Comments close	April 20, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2026-1321

Source: the Federal Register (public domain). The document in the Federal Register