Airworthiness directives › 2025-07-02
AD 2025-07-02 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: 912 iSc2 Sport, 912 iSc3 Sport, 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 BRP-Rotax GmbH & Co KG (formerly BRP-POWERTRAIN GMBH & CO KG and Bombardier-Rotax GmbH) (Rotax) Model 912 iSc2 Sport, 912 iSc3 Sport, 915 iSc2 C24, and 915 iSc3 C24 engines that are equipped with an affected part as defined in paragraph (h)(1) of this AD.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Before further flight after the effective date of this AD and thereafter before each flight, perform a first start of the battery prior to starting the engine under normal procedure as an operational check to ensure the availability of the battery backup function. (i) In order to check the sufficient state of battery capacity, do not use an additional external power source for this operational check. (ii) The owner/operator (pilot) holding at least a private pilot certificate may perform the action required by paragraph (g)(1) of this AD for your engine and must enter compliance with the applicable paragraphs of this AD into the engine maintenance records in accordance with 14 CFR 43.9(a) and 91.417(a)(2)(v). The record must be maintained as required by 14 CFR 91.417, 121.380, or 135.439. (2) If, during the operational check required by paragraph (g)(1) of this AD, the battery capacity is determined to be insufficient, before further flight, remove the engine from service. (3) Within 25 flight hours or 12 months, whichever occurs first after the effective date of this AD, perform a one-time inspection of the oil spray nozzle in accordance with the Accomplishment/Instructions, paragraph 3.4.1) of Rotax Alert Service Bulletin ASB-912 i-016 R1/ASB-915 i-016 R1/ASB-916 i-006 R1, Revision 1, dated December 20, 2024 (published as a single document) (Rotax ASB-912 i-016 R1/ASB-915 i-016 R1/ASB-916 i-006 R1). (4) If, during the inspection required by paragraph (g)(3) of this AD, any oil spray nozzle fails to meet the serviceability criteria specified in the Accomplishment/Instructions, paragraph 3.4.1) of Rotax ASB-912 i-016 R1/ASB-915 i-016 R1/ASB-916 i-006 R1, before further flight, replace the oil spray nozzle with a part eligible for installation, in accordance with the Accomplishment/Instructions, paragraph 3.5.2) of Rotax ASB-912 i-016 R1/ASB-915 i-016 R1/ASB-916 i-006 R1. (5) Within 25 flight hours or 12 months, whichever occurs first after the effective date of this AD, perform a one-time inspection of the generator stator assembly in accordance with the Accomplishment/Instructions, paragraph 3.5.1) of Rotax ASB-912 i-016 R1/ASB-915 i-016 R1/ASB-916 i-006 R1. (6) If, during the inspection required by paragraph (g)(6) of this AD, any generator stator assembly fails to meet the serviceability criteria specified in the Accomplishment/Instructions, paragraph 3.5.1) of Rotax ASB-912 i-016 R1/ASB-915 i-016 R1/ASB-916 i-006 R1, before further flight, replace the generator stator assembly with a part eligible for installation. Note 1 to paragraph (g)(6): Guidance for removal and installation of the generator stator assembly for Rotax Model 912 iSc2 Sport and 912 iSc3 Sport engines may be found in Rotax Heavy Maintenance Manual MMH-912i, Part No. 898752, Chapter 24-20-00. Guidance for removal and installation of the generator stator assembly for Rotax Model 915 iSc2 C24 and 915 iSc3 C24 engines may be found in the Rotax Heavy Maintenance Manual MMH-915 I A/C24, Part No. 898861, Chapter 24-20-00.
Unsafe condition
This AD was prompted by a report of deviations during the manufacturing process of certain sprag clutch housing and oil spray nozzles, including incorrect application of a certain thread-locker. The FAA is issuing this AD to prevent blockage of the oil nozzle, inadequate cooling, and damage to the generators. The unsafe condition, if not addressed, could result in engine in-flight shutdown and forced landing, damage to the airplane, and injury to the occupants.
Affected ADs
None.
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