Originally Posted by
TrojanCMH
Yes I know you can change same type of engines. I was talking about switching engine manufacturers. I was in DFW when all the NEOs were grounded and asked one of the MX guys there what it would entail swapping them to the LEAP and he said it wasn’t cost effective. Have to change all the wiring harnesses, change the engine pylons, change all the software, plus a bunch of airworthiness stuff. The planes come certified with that type of engine so it would entail getting them all certified again, not sure how in depth that would be.
People saying they flew old planes with different engines, while it does happen like the KC135 and some of the old DC-8s, those were engine kits that were made specifically for it and those kits required STCs and all the flight testing and BS that comes with getting those signed off. So no you can’t just take a CFM and swap it with an IAE unless there is a company out there that has been approved to do it and I don’t think there are any. It would be cheaper to just throw in a new section to the COM and AOM and train the pilots and mechanics on the new engines.
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My apologies, Was intending to respond to this post by Super EZ E, not yours:
It's a software change and hang the new engine. If you want to do it you can it just takes $$$$. At another Major I worked for we actually flew what's called a mix at times. One engine can produce 15,000 lbs and the other 12,000 lbs do the EPR correct and you're good to go. TC knows we can find airframes so why make a major order.