What this page is: a restatement of what the official Federal Register
and manufacturer records show as of the date listed below each item. It is not
a determination that any specific aircraft or engine is, or is not, in compliance.
Under 14 CFR §91.403 and §91.417, the aircraft owner/operator is responsible
for maintaining airworthiness and required records. Always verify against the official FAA
and manufacturer sources linked below before making a maintenance or airworthiness decision.
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Airworthiness Directives
3 records · 1 superseded record nested above
AD
2026-04-02
FR doc 2026-04280 · 91 FR 10513
AD 2026-04-02Published 2026-03-04Effective 2026-03-19
BRP-Rotax GmbH & Co KG (Formerly BRP-POWERTRAIN GMBH & CO KG and Bombardier-Rotax GmbH) Engines
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
Airworthiness Directives; BRP-Rotax GmbH & Co KG (Formerly BRP-POWERTRAIN GMBH & CO KG and Bombardier-Rotax GmbH) Engines
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.
Source: Federal Register document 2026-04280, retrieved 2026-08-17 · re-verified against the live Federal Register API 2026-08-17
The FAA is superseding Airworthiness Directive (AD) 2025-07- 02, which applied to certain BRP-Rotax GmbH & Co KG (Rotax) Model 912 iSc2 Sport, 912 iSc3 Sport, 915 iSc2 C24, and 915 iSc3 C24 engines.
1 AD superseded by this oneretired · earliest 2025-04-04
AD
2025-07-02
FR doc 2025-05852 · 90 FR 14719
AD 2025-07-02Published 2025-04-04Effective 2025-04-21
BRP-Rotax GmbH & Co KG (Formerly BRP-POWERTRAIN GMBH & CO KG and Bombardier-Rotax GmbH) Engines
Requires repetitive operational checks of the battery backup function with removal of the engine from service if insufficient battery power is found, one-time inspections of the oil spray nozzle and generator stator assembly…
Full official abstract
Airworthiness Directives; BRP-Rotax GmbH & Co KG (Formerly BRP-POWERTRAIN GMBH & CO KG and Bombardier-Rotax GmbH) Engines
The FAA is adopting a new airworthiness directive (AD) for certain BRP-Rotax GmbH & Co KG (Rotax) Model 912 iSc2 Sport, 912 iSc3 Sport, 915 iSc2 C24, and 915 iSc3 C24 engines. This AD was prompted by a report of deviations during the manufacturing process that caused incorrect application of a certain thread-locker to certain sprag clutch housing and oil spray nozzles. This AD requires repetitive operational checks of the battery backup function with removal of the engine from service if insufficient battery power is found, one-time inspections of the oil spray nozzle and generator stator assembly, and, depending on the results of the inspections, replacement with parts eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
Source: Federal Register document 2025-05852, retrieved 2026-08-15 · re-verified against the live Federal Register API 2026-08-17
Airworthiness Directives; BRP-Rotax GmbH & Co KG (Formerly BRP-POWERTRAIN GMBH & CO KG and Bombardier-Rotax GmbH) Engines
The FAA is superseding Airworthiness Directive (AD) 2025-07- 02, which applied to certain BRP-Rotax GmbH & Co KG (Rotax) Model 912 iSc2 Sport, 912 iSc3 Sport, 915 iSc2 C24, and 915 iSc3 C24 engines. AD 2025-07-02 required repetitive operational checks of the battery backup function with removal of the engine from service if insufficient battery power is found, one-time inspections of the oil spray nozzle and generator stator assembly, and, depending on the results of the inspections, replacement with parts eligible for installation. Since the FAA issued AD 2025-07-02, the FAA has determined that the inspection of the generator stator assembly should be an on-condition action depending on the results of the oil spray nozzle inspection. This AD retains all of the requirements of AD 2025-07-02 and changes the one-time inspection of the generator stator assembly and wiring to an on-condition action based on the results of the one-time inspection of the oil spray nozzle. The FAA is issuing this AD to address the unsafe condition on these products.
Source: Federal Register document 2025-13796, retrieved 2026-08-15 · re-verified against the live Federal Register API 2026-08-17
