Airworthiness directives › 2026-04-02
AD 2026-04-02 Airworthiness Directives; BRP-Rotax GmbH & Co KG (Formerly BRP-POWERTRAIN GMBH & CO KG and Bombardier-Rotax GmbH) Engines
Makes named: rotax, brp-rotax. Models named: 915 iSc2 C24, 915 iSc3 C24. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all BRP-Rotax GmbH & Co KG (formerly BRP-POWERTRAIN GMBH & CO KG and Bombardier-Rotax GmbH) (Rotax) Model 915 iSc2 C24 and 915 iSc3 C24 engines.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For the purpose of this AD: (1) A “serviceable gearbox” is a propeller gearbox that meets one of the conditions in paragraphs (g)(1)(i) through (iv) of this AD. (i) A propeller gearbox having Part Number 686790 that has passed the inspection required by paragraph (h)(1) of this AD. (ii) A propeller gearbox manufactured after November 18, 2025. (iii) A propeller gearbox that was overhauled after November 18, 2025. (iv) A propeller gearbox having a serial number that is not listed in paragraph 4) Appendix, of Rotax Alert Service Bulletin ASB-915 i-021R1/ASB-916 i-009R1, Revision 1, dated November 27, 2025 (published as a single document) (Rotax ASB-915 i-021R1/ASB-916 i-009R1). (2) An “affected propeller gearbox” is a propeller gearbox that is listed in paragraph 4) Appendix, of Rotax ASB-915 i-021R1/ASB-916 i-009R1.
Unsafe condition
This AD was prompted by a report of a certain collar nut that was not installed on the propeller gearbox. The FAA is issuing this AD to detect and correct a collar nut that was not installed on the propeller gearbox. The unsafe condition, if not addressed, could result in an in-flight engine failure and loss of propeller retention, possibly resulting in loss of control of the airplane.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1