FlyerTalk Forums - View Single Post - strange noise from a 777

Dec 20, 2011, 6:58 am

#2

pacer142

Join Date: Nov 2006

Programs: Flying Blue, easyJet Plus (!)

Posts: 1,762

You get this on Airbus A320 series aircraft as well, mainly when only one engine is running. It's a device that equalises pressure between the multiple hydraulic systems.

http://en.wikipedia.org/wiki/Power_transfer_unit

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