When we did our overhauls, it was routine for the airplane to return from its verification flight with a clean log book. I have personally gotten airplanes from our wonderful outsourced overhaul facilities that come straight from them to us and had to work a dozen items before we could put the a/c back into service. Th MD88's are the worst.
We did them faster and better. End of story.
Do our mechanics make mistakes? Of course, we are all human, but in the end we turn out a much superior product.
yet, somehow, DL, a profitable airline and other airlines which have managed to figure out how to make money even in recessions, have figured out that it is possible to outsource some aspects of the maintenance operation, ensure proper checks before those planes are put back in service, and still run a high enough quality maintenance operation that other airlines are willing to give you and your DL Tech Ops colleagues (via DL's bank accounts, mind you) $500 million to fix THEIR planes.
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Is it possible that even w/ the work that you have to do after those planes come back from MRO overhaul, the total job gets done cheaper than it would have been done if it had been done totally inhouse, and you and other mechanics as well as DL pilots serve the purpose of ensuring that the planes are in airworthy condition?
You do realize that DL's facilities couldn't possibly overhaul its fleet inhouse and the only option would be to build new or reoccupy some of the facilities which DL and/or NW gave up and there is no assurance (according to Bob Owens on the AA forum) that DL could even find enough mechanics to properly staff those newly opened overhaul lines?
I am quite sure that you can do the work faster but I would also bet that DL has factored in the cost of having two or three additional aircraft in their fleet of 750 in order to cover the increased turn times for MRO overhaul vendors.
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Living in the current reality says that there is no viable airline in the Americas that does all of its overhauls in-house; figuring out how to survive in the world that has changed over the past 10 years and thrive is what has set DL apart from other airlines with respect to Tech Ops.
While other airlines have chosen to outsource with little benefit for DL mechanics, DL has chosen to insource where it makes sense, higher new mechanics and create high value revenue streams for the company which benefit not only DL Tech Ops but employees throughout the company.
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Understanding how to not just survive but also thrive in the midst of an ever-changing world is what separates the "also-rans" of the world from the leaders, regardless of the field that is being discussed.