PPRuNe Forums - Noise Before Take Off

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Lucky747

25th May 2009 21:00

Noise Before Take Off - Airbus Mainly

Just before i begin i would like to point out i'm not a pilot, but i do fly a lot and i have noticed before take off mainly on Airbus 319 / 320 there is a sound that sounds like someone is putting rivets into the metal work, a sound i almost expect each time i take off now.

Can anyone inform me what this noise is ?

Paracab

25th May 2009 21:45

Hydraulic power transfer unit (PTU). Sounds like sawing or a dog barking. A quick search will provide a more thorough answer, this question is asked about once a week so better not take up much more bandwidth with it! ;)

Lucky747

25th May 2009 21:53

Thanks for clearing that up for me.

I shall ask no more.

Regards

rogerg

26th May 2009 05:43

Quote:

so better not take up much more bandwidth with it!

Why do us pruners have to worry about "bandwidth"? What is that in relatation to posting?
Or is that just your way of reminding him of the "search" facility, which in itself probably took up some "bandwidth"

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