Airworthiness Directive · Amendment 39-23090 · Exhaust turbocharger
BRP-Rotax GmbH & Co KG (Formerly BRP-POWERTRAIN GMBH & CO KG and Bombardier-Rotax GmbH) Engines
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.
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.
(1) As of April 21, 2025 (the effective date of AD 2025-07-02), before further flight 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 April 21, 2025 (the effective date of AD 2025-07-02), perform a one-time inspection of the oil spray nozzle for serviceability (sufficient flow) 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, do the following:
(i) 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.
(ii) Within the applicable compliance times specified in paragraphs (g)(4)(ii)(A) or (B) of this AD, perform a one-time inspection of the generator stator assembly and wiring for serviceability (signs of discoloration or overheating, and resistance values outside of the nominal range, 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.
(A) Before the effective date of this AD, perform the inspection within 25 flight hours or 12 months, whichever occurs first after April 21, 2025 (the effective date of AD 2025-07-02).
(B) On or after the effective date of this AD, perform the inspection before further flight.
Note 1 to paragraph (g)(4)(ii) and (iii): 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.
(iii) If the generator stator assembly fails to meet the serviceability criteria specified in paragraph (g)(4)(ii) of this AD, before further flight, replace the generator stator assembly with a part eligible for installation.
(1) For the purpose of this AD, an “affected part” is a generator stator assembly, or an oil spray nozzle assembly having part number (P/N) 456540 manufactured before October 31, 2024, that is:
(i) Installed on an engine with a serial number specified in the Appendix to Rotax ASB-912 i-016 R1/ASB-915 i-016 R1/ASB-916 i-006 R1; or
(ii) Known to have been delivered as a spare part, as specified in Planning Information, Paragraph 1.1, Criterion B), of Rotax ASB-912 i-016 R1/ASB-915 i-016 R1/ASB-916 i-006 R1; or
(iii) Unable to be excluded from the criteria listed in paragraph (h)(1)(i) or (ii) of this AD.
(iv) A generator stator assembly or an oil spray nozzle assembly is not considered an “affected part” if it has been in operation for 200 flight hours or more without a required maintenance action due to generator stator assembly cooling issues.
(2) For the purpose of this AD, a “part eligible for installation” is any of the following:
(i) An oil spray nozzle having P/N 456540, manufactured after October 31, 2024.
(ii) For Rotax Model 912 iSc2 Sport and 912 iSc3 Sport engines, a generator stator assembly having P/N 891095.
(iii) For Rotax Model 915 iSc2 C24 and 915 iSc3 C24 engines, a generator stator assembly having P/N 889562.
The actions specified in paragraphs (g)(3) and (4) of this AD constitute terminating action for all the requirements of paragraph (g)(1) of this AD.
You may take credit for the actions required by paragraphs (g)(3) and (4) of this AD if you performed those actions before the effective date of this AD using Rotax Service Bulletin SB-912 i-016/SB-915 i-016/SB-916 i-006, dated December 16, 2024 (published as a single document).
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
