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Mar 3, 2021 at 18:21 comment added Jörg W Mittag The design target for F9 was 10 flights with minimal refurbishment. That implies at a minimum 30 firings for the center engine, assuming absolutely no test firings and only RTLS landings. As most landings are drone ship landings, and there are a couple of test firings as well, it's more like 40+. We have one booster that as flown 8 times, so it looks like they at least hit their target, maybe they even found during the last checkouts that they can go higher. Soot buildup / coking is going to be one of the major problems where they will at some point have to strip and clean the engines.#
Mar 3, 2021 at 15:10 comment added Carl Witthoft Which suggests the FEMA (failure analysis) work done during design was aimed at a mean lifetime of more than 100 ignition cycles to meet reliability requirements.
Mar 3, 2021 at 10:50 vote accept Ashvin
Mar 3, 2021 at 6:41 history edited Jörg W Mittag CC BY-SA 4.0
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Mar 3, 2021 at 6:36 history answered Jörg W Mittag CC BY-SA 4.0