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Airworthiness Directive

AD 2026-04-02 91 FR 10513 Active

Federal Aviation Administration · 14 CFR part 39

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.

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FR document
2026-04280
Amendment
39-23261
Published
2026-03-04
Effective
2026-03-19
Models covered
1

Last live check: 2026-08-19

Printed from https://aircraftdirectives.com/ad/2026-04-02 · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

This page is a reference Record, not an airworthiness or compliance determination. Official FAA and manufacturer sources control over our restatement, subject to governing law. Check applicability, current requirements and incorporated documents before acting. The owner or operator remains responsible for airworthiness and required records under 14 CFR 91.403 and 91.417, as applicable. Terms of Use: /terms.

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AD

2026-04-02

FR doc 2026-04280 · 91 FR 10513

AD 2026-04-02Published 2026-03-04Effective 2026-03-19

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

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.

Full official abstract

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.

More directives for Rotax 915

  1. AD 2025-15-03 Airworthiness Directives; BRP-Rotax GmbH & Co KG (Formerly BRP-POWERTRAI... Effective 2025-08-06
  2. AD 2025-07-02 Airworthiness Directives; BRP-Rotax GmbH & Co KG (Formerly BRP-POWERTRAI... Effective 2025-04-21

All Rotax 915 directives

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)

Applies to 1 model in our index