Airworthiness Directive · Amendment 39-16959 · BRP-Powertrain GmbH & Co KG Rotax Reciprocating Engines
BRP-Powertrain GmbH & Co KG Rotax Reciprocating Engines
This AD applies to BRP-Powertrain GmbH & Co KG:
(1) Rotax 912 S2 and 912 S3 reciprocating engines, serial numbers (S/Ns) 4,924.287 to 4,924.295 inclusive, 4,924.300 to 4,924.304 inclusive, 4,924.342 to 4,924.350 inclusive, 4,924.352, and 4,924.353.
(2) Rotax 914 F2 reciprocating engines, S/Ns 4,421.079, 4,421.080, and 4,421.081.
We are adopting a new airworthiness directive (AD) for BRP- Powertrain GmbH & Co KG Rotax 912 S2, 912 S3, and 914 F2 reciprocating engines. This AD requires performing a one-time inspection of the oil system for leaks and a torque check of the oil pump attachment bolts, and if leaks are detected, performing a one-time inspection of the oil pump and engine valve train, on certain serial number (S/N) BRP- Powertrain GmbH & Co KG Rotax 912 S2, 912 S3, and 914 F2 reciprocating engines. This AD was prompted by the discovery that during engine production, some engines may not have had the oil pump attachment bolts torqued to specification. We are issuing this AD to prevent oil leaks, which could result in an in-flight engine shutdown and forced landing.
Unless already done, do the following actions within four flight hours or 30 days after the effective date of this AD, whichever occurs first.
(1) Inspect the oil pump and engine valve train for oil leaks in accordance with paragraph 3.1) step 1. of BRP-Powertrain GmbH & Co KG, Rotax Aircraft Engines Mandatory Alert Service Bulletins (ASBs) No. ASB-912-060 and No. ASB-914-043 (combined in one document), dated January 26, 2012.
(2) If no leaks are found during the inspection, tighten the four oil pump attachment bolts with lock washers installed to 10 Nm (90 in. lb.).
(3) If any leaks are found during the inspection specified in paragraph (e)(1) of this AD, do the following:
(i) Remove the oil pump and inspect all surfaces for wear, cracks, or damage. If any measurable wear, cracking, or damage is found, reject the oil pump. If no measurable wear, cracking, or damage is found, replace the three o-rings and the four gasket rings and reinstall the oil pump.
(ii) Inspect the engine valve train washers for increased wear, in accordance with paragraph 3.1.3) steps 19. through 21. of BRP-Powertrain GmbH & Co KG, Rotax Aircraft Engines Mandatory ASBs No. ASB-912-060 and No. ASB-914-043 (combined in one document), dated January 26, 2012.
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.
