[givemeethekeys]

I've always wondered what the wheel tightening noises are right before taxiing.

[trbleclef]

That's Airbuses. https://www.youtube.com/watch?v=oPUWaaXMvcg

[p1mrx]

So it's the hydraulic equivalent of a buck/boost converter?

[Faaak]

nicely put, but yeah.

More pleasant than the dying whale sound™ produced by some of the engines they use (PW1000G)

[ttymck]

Do you mean the drill-like noises (reminds me of racing impact wrench)? I always assumed that was the cargo pay door securing itself.