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Sawing up an A319 just after it's parked?

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Sawing up an A319 just after it's parked?

Old 29th May 2006, 12:50
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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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Old 29th May 2006, 13:16
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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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Old 29th May 2006, 13:43
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It will also operate when the loaders activate the opening of the cargo doors to get out your luggage, irrespective of taxi practices.
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Old 29th May 2006, 17:32
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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...
Sorry, but not true. PTU-Funktion is inhibited when the Yellow electric pump is in operation to open/close the cargo doors.
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Old 30th May 2006, 03:43
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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....
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Old 30th May 2006, 09:16
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Thanks to all!
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Old 30th May 2006, 14:44
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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.

Cheers,
mcdhu
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Old 1st Jun 2006, 17:28
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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.
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Old 2nd Jun 2006, 19:18
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But it is in the SE Taxi Procedure at 3.4.90 which says:

"At parking :

-Y ELEC PUMP OFF

-ENG 1 SHUT DOWN"

Cheers,
mcdhu
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