UPDATE!
***Expansion tanks with a sticker labeled P/N 622050 OR 622051, located on the side of the tank, may correspond to Rotax P/N 922 666 or 922 668, which are affected by this Service Bulletin (SB). The sticker number alone cannot be relied upon to accurately identify the correct part number for the affected coolant expansion tanks. If your engine serial number (S/N) is listed in the SB document (certified or non-certified), you must inspect the expansion tank and replace it if necessary***
ROTAX Releases New Mandatory Service Bulletin: Inspection and/or replacement of expansion tank assy. for ROTAX® 912, 914, 912 i, 915 i and 916 i (Series) Aircraft Engines. This SB affects both Certified and Non-Certified ROTAX 900 series aircraft engines.
ROTAX® has issued a Service Bulletin for specific 912, 914, 912 i, 915 i, and 916 i engines. The bulletin addresses a potential defect in the expansion tank, where inadequate welding could cause coolant leaks.
We have initiated a discussion in this forum to address any questions you may have regarding the information presented in the video and SB.
- For more details, watch the video HERE – https://www.rotax-owner.com/en/videos-topmenu/912-is-videos/801
- Read the Service Bulletins in the attachments
What is this about?
ROTAX® has issued a Service Bulletin for certain 912, 914, 912 i, 915 i, and 916 i engines. A potential defect in the expansion tank could cause coolant leaks, leading to engine overheating and safety risks.
What you need to do:
If you own, operate, distribute, or service ROTAX® 912, 914, 912 i, 915 i, or 916 i engines within the specified serial number range listed in either the certified or non-certified Service Bulletin (SB) documents, or if you have any of the spare parts mentioned in the bulletin, you are required to take action.
- Review the Service Bulletin – Check both the certified and non-certified SB documents to see if your engine or spare parts are affected.
- Verify Engine Serial Numbers and Production Dates – Match your engine’s serial number and production date against the affected engine lists provided in the certified and non-certified SB documents.
- Check for Overhaul Kit Installations – Determine if your engine has had any of the overhaul kits listed in the Service Bulletin installed.
Deadline for Compliance:
- Uninstalled engines/spare parts prior to usage but no later than 31 December 2025.
- If coolant leakage is detected at the required pre-flight check, immediate action should be taken.
- At the next scheduled maintenance or within 25 operating hours (but no later than 1 year from the issuance of the bulletin).
