Most countries are member of the International Civil Aviation Organization (ICAO) and as such have signed the "Chicago Convention 1944" (111 pages, 2 Mb). Aviation rules and regulations in member countries are based on the recommendations of the ICAO.
The United Kingdom CAA has published EASA emergency airworthiness directive 2011-0222-E regarding the crankshaft in some Rotax 912 and 914 Aircraft Engines. The AD is 10 pages and in multiple languages.
Rotax also issued a service bulletin: SB-912-059-914-042.
Excerpt from the document:
During a production process review, a deviation (double side straightening) in the manufacturing process of certain Part Number (P/N) 888164 crankshafts has been detected, which may have resulted in cracks on the surface of the crankshaft. Only a few crankshafts are suspected to have received this double side straightening treatment, but it has been impossible to identify these by individual serial number (s/n).
To address this safety concern, BRP-Powertrain issued Alert Service Bulletin ASB-912-059 and ASB-914-042 (single document) with instructions to identify and inspect the entire batch of crankshafts that could be affected. These crankshafts have been installed on a limited number of engines, but some crankshaft sets have also been shipped as spare parts. This condition, if not detected and corrected, could lead to crack propagation on the power take off side of the crankshaft journal, possibly resulting in failure of the crankshaft support bearing, in-flight engine shutdown and forced landing, damage to the aeroplane and injury to occupants.
To continue reading see the pdf below (in French, English and German):