Wed, Nov 16, 2011
Inspections Must Be Conducted Before Further Flight
Rotax has issued service bulletins for many of its 912 and 914
The bulletins apply to both 921A, F, S UL, ULS, and ULSFR model
engines, as well as a group of its 914F and UL engines. The
bulletins outline steps to be taken as the result of a "deviation"
in the manufacturing process of some crankshafts causing a crack
formation to occur on the power take off side. Rotax says the
cracks can case a breakage of the crankshaft support bearing and
may lead to engine stoppage.
According to the bulletins, the engines must be checked for
cracks in the crankshafts before any further flight, and not later
than January 1st, 2012.
If a ferry flight is required, a magnetic plug check must be
conducted prior to the flight. If no deviations, such as chips or
excess metal filings are found, the engine may be operated for a
maximum of four hours.
Specific serial number series can be found at the FMI links
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