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Airbus sound question

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Let me get this straight...

A FRENCH airplane that has YELLOW and GREEN hydraulic systems? That's just too good......:D
 
At US Airways, we also run the yellow electric pump during single eng taxi. However, before turning eng #2, we actually turn the yellow pump off so we can test the PTU. I know it's annoying for the pax, but at least we know it works if we need it.

What's wrong with the self-test it does automatically during the second engine start?
 

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