A320 one engine taxi
Why do we have to taxi in a straight line for five seconds during PTU test?
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PRO-NOR-SUP-ENG P8/10
This is only for the Taxi out procedure. You are turning the Y Elec Pump off before ENG 2 start, so no pumps are pressurising the Y HYD SYS. The PTU runs a self test for 5 secs as stated, therefore isn't providing Px to the Y HYD SYS during this time. So keeping it straight for 5 secs will allow all this to happen then the PTU will kick in to pressurise the Y SYS. If you try and steer the a/c during this time, that will use HYD Px from the Y system possibly resulting in Low PX. That's how I understand it. |
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