Rotax Issues Mandatory Alert Service Bulletin
November 16, 2011 – Rotax has issued a Mandatory Alert Service Bulletin for owners and operators of certain Rotax 912- and 914-series aircraft engines, including certified and uncertified units. The ASB requires affected engines be checked for cracks in the crankshaft before further flight is permitted, or by January 1, 2012.
The ASB affects only a limited number of engines and spare parts crankshafts (approximately 200 worldwide), and owners should check Section 1 of the bulletin for a list of affected engine and crankshaft serial numbers. Certified engines have a red-colored serial number tag located on the ignition housing. (View certified ASB here.) Non-certified engines have a black serial number tag. (View non-certified ASB here.)
According to Rotax-Owner.com, those owners who discover their serial number is in the affected range and require a ferry flight to move the aircraft to an acceptable NDT inspection facility must conduct an immediate magnetic plug inspection first. If no unusual or excess material is found on the magnetic plug, further flight to a maximum of four hours is permitted to a qualified facility for final NDT testing to determine if the crankshaft has any crack formation. This NDT test is not recurring and any engines/crankshafts that pass the inspection are deemed unaffected and therefore can continue service with no further action.