philidor
in service - 6 years
Posts: 8,950
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Post by philidor on Feb 13, 2018 1:04:40 GMT 1
If this fix is enough to solve the problem, then the latter will be quickly forgotten. I suspect, however, that this may be a temporary fix, not a permanent one.
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cck
Final Assembly Line stage 1
Posts: 228 
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Post by cck on Feb 13, 2018 2:02:52 GMT 1
It says “present a fix”, most likely just a design proposal, i suppose it will take longer time to manufacture, just like all fix to-date. |
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philidor
in service - 6 years
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Post by philidor on Feb 13, 2018 14:09:07 GMT 1
It says “present a fix”, most likely just a design proposal, i suppose it will take longer time to manufacture, just like all fix to-date. P&W is saying that the problems were caused by an engineering change that they made this summer. This probably means that it is not a design issue, rather a change in the manufacturing process or a change in materials used. If so, the fix might be quicker to implement. |
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Baroque
in service - 2 years
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Post by Baroque on Feb 13, 2018 20:30:15 GMT 1
What's rather annoying to me is how many of these problems seem to have nothing to do with the core gearbox components. It's a good piece of technology they've worked hard on for several years and perfected it, but they seem to have let their guard down on other aspects of the engine.
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philidor
in service - 6 years
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Post by philidor on Feb 14, 2018 0:13:08 GMT 1
What's rather annoying to me is how many of these problems seem to have nothing to do with the core gearbox components Far from being annoying, it's a saving grace ! If all their problems were related to cutting-edge technology, then there would be a growing suspicion that the technology is not mature. Fortunately, the problems are mundane, there is no doubt that they'll get over them. |
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sciing
in service - 1 year
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Post by sciing on Feb 15, 2018 8:41:56 GMT 1
What's rather annoying to me is how many of these problems seem to have nothing to do with the core gearbox components. It's a good piece of technology they've worked hard on for several years and perfected it, but they seem to have let their guard down on other aspects of the engine. I don‘t know if they are really unrelated. The gear is not mainly used to decrease fan speed that much, but to increase the speed of the low pressure shaft. So LPC and LPT run at much higher speed 4k vs. 10k rpm. |
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mjoelnir
in service - 2 years
Posts: 4,089
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Post by mjoelnir on Feb 15, 2018 13:11:49 GMT 1
What's rather annoying to me is how many of these problems seem to have nothing to do with the core gearbox components. It's a good piece of technology they've worked hard on for several years and perfected it, but they seem to have let their guard down on other aspects of the engine. I don‘t know if they are really unrelated. The gear is not mainly used to decrease fan speed that much, but to increase the speed of the low pressure shaft. So LPC and LPT run at much higher speed 4k vs. 10k rpm. That may be, but they still do not run at the speed of the HPC/HPT, so the technology to run shafts and sealings at this speed are there. |
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Baroque
in service - 2 years
Posts: 3,991
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Post by Baroque on Feb 15, 2018 15:24:44 GMT 1
What's rather annoying to me is how many of these problems seem to have nothing to do with the core gearbox components. It's a good piece of technology they've worked hard on for several years and perfected it, but they seem to have let their guard down on other aspects of the engine. I don‘t know if they are really unrelated. The gear is not mainly used to decrease fan speed that much, but to increase the speed of the low pressure shaft. So LPC and LPT run at much higher speed 4k vs. 10k rpm. I'm with you there of course. What I was saying was that they've taken a long time to mature and perfect the gearbox technology but it feels like the rest of the engine elements were cobbled together in a hurry without as much planning and testing to bring it to service. Also, I think I remember some pieces of technology were dropped near the EIS with other alternatives being incorporated due to manufacturing rate issues. |
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mtrunz
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Post by mtrunz on Feb 15, 2018 18:27:23 GMT 1
Can that be confirmed by someone?
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s543
in service - 2 years
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Post by s543 on Feb 15, 2018 18:34:15 GMT 1
And we have a common problem - manufacturing cost x quality (what-ever it means).
Just remember that the engine produces something something like like 25MW of raw power. So the transmission must carry this and weight as little as possible. Just look how much similar industrial transmission weights .... tons and tons.
They probably thought the rest is just normal engine we have made thousands and thousands of those - no problem and ..... here it is.
I am absolutely sure those are teething problems caused by fast ramp up and by trying to economize where ever possible and somewhere obviously it went too far and economizing ended by being VERY expensive.
They will solve it fast - no doubt here.
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