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Thread: Lack of lubrication certification for helicopter gearboxes
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Old 31st July 2017 | 19:39
  #17 (permalink)  
RVDT
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From: After all, what’s more important than proving to someone on the internet that they’re wrong? - Manson
Not to read too much into it - Leonardo claim that the 139 has proven to be good for 60 minutes and the 189 for 50 minutes on certification tests.

So it's not as if it cannot be achieved. They obviously put a bunch of work into it.
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