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Ch47 transmission oil system


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#1 sbox23

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Posted 18 July 2019 - 06:18

Hi, anyone know why only the aft vertical shaft and combining transmission auxillary low pressure lights up at 10 PSI whereas the rest of the transmission low pressure lights up at 20psi?

#2 AS350 pilot

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Posted 19 July 2019 - 20:50

I have asked this same question and never really gotten a for sure answer. So heres my best guess; the aft shaft is so much higher then the aft transmission that even though its a 20psi pump, by the time it gets all the way up there all you can expect is 10. As for the c-box maybe we can get someone with more 47 experience to weigh in.
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#3 sbox23

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Posted 23 July 2019 - 08:15

Thanks for the reply @AS350 pilot. was really thinking whether both system got to do with the low amount of oil flowing through that why it only require 10 psi.Still hoping that someone has the answer.
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