PPRuNe Forums - PTU in-flight A318?

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pax2908

11th Sep 2012 19:08

PTU in-flight A318?

Hello, is it normal (common?) to have the PTU operate briefly (~5-10 seconds) during approach (possibly following LG extension) ?

Reimers

12th Sep 2012 08:24

Yes, it is!

Yes, it is a normal occurence.
There is so much demand on the green system during extension that the requirements for PTU start of operation are met. Green ENG 1 pump does not have enough capacity to hold the Green system pressure above 2500 psi during gear extension/retraction, so briefly, the PTU will kick in. Should the yellow system not operate, the gear cycle will just take a bit longer to complete.

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