Frequent and a maybe-a-little-too-nervous flyer here. Recently I've been taking the ORD-WAW course with LOT on the 787 Dreamliner and started noticing a sound that's been a little spooky for a person who's seen a little too many flight-crash explanation videos (I know, I'm trying to quit). My next flight is in October, and before that I wanted to find any technical reason why I shouldn't worry.
The noise was captured on this youtube video. It's the "thudding" noise that cuts right before the video ends: LINK
This sound took place after landing but I believe I experienced it also before take off and it's accompanied but a rhythmic beating feeling from the bottom.
If there's anyone here who could elaborate on the supposed source of the noise it would be very helpful for me.
Additionally, if you guys could also elaborate on the high-pitched noise it would be even better because it's a sound I keep hearing before take-off and right before landing and it's scaring me every since the flight prior where after some technical-issues were fixed the high-pitch noise would be followed by this weird sound close to a high-pitched version of trying to start an engine, followed by a hissing-sound (which made me thing we're about to crash only...four dang times).
I understand this question might be a little vague, and if there's any details then I would love to elaborate. Being and engineer I suppose I'm much more forgiving for strange noises when I somewhat aware what it could be.
Any help would be greatly appreciated!