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Just swapped out a set of old bleed air valves on a 737.
They were from a 2005 build. The new ones from the 2023 batch have a different internal coating. The old ones would start sticking around 800 flight hours. The new design is supposed to go 1500 before needing a clean. Saw the difference on the borescope, way less carbon buildup. Anyone else run into this on the NG models yet?
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sean5021mo agoTop Commenter
Seriously, wonder if the coating change messes with the heat tolerance at all.
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