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SB compliance at time of engine manufacture

  • AllenInks
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2 months 4 weeks ago - 2 months 4 weeks ago #21564 by AllenInks
I was trying to find ASBs and SBs applicable to a particular 912 UL engine (serial number 6,770,8XX), and did a search for "All Document types for Engine Serial #...."

One of the documents that was pulled up was SB-912-036UL. Per section 1.1 Engines affected, the SB was for "All versions of the engine type: - 912 UL (Series)..." The latest revision of this SB came out in August 2002. My engine wasn't built until 2012, a decade later.

This SB calls for reference to SB 912-036m /sb-914-022 latest edition, which in turns calls inspecting correct venting of the hydraulic valve tappets, on new engines, prior to first start.

Really? Someone is supposed to dig into the aircraft engine that has just come off the assembly line, with all the quality control checks of that process, and check for the existence of a problem identified 10 years before the engine was built? Or was that for new engines in 2002 (i.e., engines still in the supply pipeline, which were manufactured prior to August 2002, but not yet started)?

I would expect that whatever problem led to the issuance of the SB would be addressed in the factory, and thus, not be applicable to engines produced long after the date of the Service Building. Is this unreasonable? Why wouldn't they build in compliance with a service bulletin of this type?


And then there's this: The aircraft manufacturer made this entry in the engine log book when the engine was installed in the aircraft: "Status of Relevant SB on Dat 15.02.2013: OK". So... all extant SBs were complied with as of that date ... I guess. What do you guys think?
Last edit: 2 months 4 weeks ago by AllenInks. Reason: typo

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2 months 3 weeks ago #21573 by RobSeaton
Replied by RobSeaton on topic SB compliance at time of engine manufacture
Every engine has the oil purge done at the test-run/break-in but you have to do it again as your oil system is new and full of air.

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2 months 3 weeks ago - 2 months 3 weeks ago #21575 by admin
In general, all of the SBs only apply to engines that were built BEFORE their date of issue. All subsequent engines incorporate the necessary improvements when they are constructed. (That doesn't exempt you from regular maintenance procedures, as Rob points out...)
Last edit: 2 months 3 weeks ago by admin.

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