Aquasky18 wrote:Does anyone know what the swishing/thumping noise that can be heard when sitting over the trailing edge of the wings on the a330 during tax is caused by? It sounds similar to the clunking noise made when the brakes are applied or released on the a320, but has a unique hissing/swishing sound, similar to fluid moving through a hose, that can be heard immediately before the thump. I've flown on the a340 as well, but have never heard it on that aircraft- only the 330.
you can hear it very clearly in this video https://www.youtube.com/watch?v=-vhLxEkArtE. The best example is at 10:47, but it also happens at 4:39 and 11:32.
767333ER wrote:It’s the brakes being applied and it is followed by another thump when they are released much like when an A320 thumps when brakes are applied and thumps twice when they are released. I’d say the noise comes from the hydraulic system. The 767 makes a very similar noise when it’s brakes are released.
Apprentice wrote:This devices, using high pressure hydraulic from a pressurized system, make turn an “hydraulic motor”, linked to an hydraulic pump that pressurize the remaining hyd system.
Apprentice wrote:From a “2 ‘Engine Dc-10 Schematic.......”
Apprentice wrote:PTU, If a Boeing terminology, it is?
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