Sawing up an A319 just after it's parked?
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Sawing up an A319 just after it's parked?
Been doing a bit of positioning up and down twixt LHR and MAN lately on BMI A319s, and I can't help noticing that shortly after they've parked it, a sound comes from underneath the floor which sounds for all the world like somebody's sawing the thing up. Wossat?
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it's the hydraulic power transfer unit - PTU. Shouldn't really be operating unless the yellow system electric pump has been turned on, perhaps due to single engine taxiing.
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Originally Posted by TopBunk
It will also operate when the loaders activate the opening of the cargo doors to get out your luggage...
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IFix
Sorry, you are of course correct, the Yellow system Electrical pump powers the hydraulics to open the cargo doors. No longer fly the 'bus - how quickly one forgets detail....
Sorry, you are of course correct, the Yellow system Electrical pump powers the hydraulics to open the cargo doors. No longer fly the 'bus - how quickly one forgets detail....
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Yup, usually due to the SE taxi procedure. On stand the procedure is Ylo Elec Pump OFF, Eng 1 Shutdown which finds the Ylo(Eng2) hyd system now powered via the Ptu from the running down Eng1 (Green) hyd system and is so until 5% or so N2 whereupon it all dies.
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mcdhu
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mcdhu
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I reckon that about 50% of A320 that arrive on gate after a single engine taxi have the PTU running. Our crew have a drill to turn on the Hyd pump before shutting down Nbr 1 engine, but turning the pump off is not in the shutdown drill.
