Rotax Aircraft Engines

Rotax four stroke aircraft engines have proven themselves as reliable engines. They can be bought as experimental (UL) or certified (A and F) engine and there are three main models to date. The original engine is the 80 hp 912, from which the 100 hp 912S was developed and Rotax also has a 115 hp turbocharged 914 engine.

During a manufacturing process check a deviation was found in certain crankshafts in Rotax 912 and 914 engines after a certain serial number. Only newer and rebuild engines seem to be affected by this issue.

This check / repair involves removing the gearbox and performing a non destructive penetration check to detect cracks in the thread runout area.

Bombardier Rotax Service Bulletin

SB-912-059-914-042, Crankshaft manufacturing deviation.