Why are King Air 350 PT6 operating temps the way they are? I’ve been taught to cruse at 785 as per Beech/Textron maintenance recommendations. My non typed not really qualified FO claims I am ruining Engine life by running these temps. He likes to cruse in the 750 range. I don’t really care so long as he’s doesn’t kill me. But to say I’m destroying the engines by running at 785 is a little bit annoying. Am I actually damaging the aircraft by operating at 785?

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    $\begingroup$ First off, why isn’t your F/O qualified or typed? Secondly, why are you listening to him if he’s not qualified in the aircraft? $\endgroup$
    – MD88Fan
    Jan 10 at 0:57
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    $\begingroup$ "Ruining" is a bit of a stretch if you are following Beech/Textron recommendations. Show him that and end the conversations. However, running cooler will ALWAY result in longer life, so his argument is not without some merit... $\endgroup$ Jan 10 at 2:53
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    $\begingroup$ Extraordinary claims require extraordinary evidence. Can this guy cite information, either from Beechcraft or Pratt & Whitney Aircraft of Canada confirming this? If he's not typed in the thing, I'm not buying it otherwise. $\endgroup$ Jan 11 at 3:57

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