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Borescope the turbine or just trust the trend? A 737 fan blade debate
Had a CFM56-7B with a slight vibration reading at Denver last month, oil samples looked fine but the trend data kept creeping up. I pulled the borescope and found a little nicking on the HPT blades that wasn't in the last report, but the senior guy says I wasted 2 hours and we should've just watched the trend for another cycle. Do you guys go in early when the numbers are borderline, or wait for a hard limit before you open things up, or is there a middle ground?
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the_drew1mo ago
Oh man, I've been there! I had a similar call on an RB211 where the numbers were borderline and everyone said I was overthinking it. I popped the scope anyway and found a cracked vane, turned out it was a two day fix instead of a cheap line repair. Better to be the guy who looks silly for an hour than the guy explaining an engine out.
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nancyg141mo ago
So what did the paperwork end up looking like for that scope? I’m curious if the logbook entry made you sound like a hero or if you had to fight to get the write-up signed off. Because I’ve seen borderline calls get buried by supe pressure, especially when the bird is due out.
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