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SB: Mandatory Inspection and Replacement of Expansion Tank Assy (SB-121924-A)

Due to a deviation in the ROTAX manufacturing process, the individual components of the expansion tank assembly may not be sufficiently welded. Sealing of the assembly may be compromised and coolant leakage and subsequently an overheating of the engine may occur.

https://www.iconaircraft.com/wp-cont...-Tank-Assy.pdf

S/N: 00001-00224

TIME OF COMPLIANCE: At next scheduled maintenance event, within the next 25 hours of operation, or 1 year from the date of the initial issue of this Service Bulletin, WHICHEVER COMES FIRST.

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The affected engines are:

912iS Sport
S/N 770 6446
S/N 770 6513
S/N 770 6518 - S/N 770 6935
S/N 10000070 up - S/N 10004526

It looks like my engine on #140 (770 5609) is too old to be affected.