ManuCH From Switzerland, joined Jun 2005, 2971 posts, RR: 51 Posted (3 years 10 months 5 days 13 hours ago) and read 2866 times:
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Recently I've been flying on an LX A330-200 and I was sitting in row 18. I assume that's more or less above the main landing hear.
Fact is, while taxiing, and even while just waiting on the taxiway or runway standing still, I heard strange metal noises coming from below. The best way to describe it is someone banging iron rods one against the other.
When lined up on the runway, the noise stopped for about a minute, while waiting for take-off clearance. Then, about 10 seconds before the engines started spooling up, the noise started again.
I was wondering what exactly produces these noises. Can anyone help?
Tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 81 Reply 4, posted (3 years 10 months 5 days ago) and read 2673 times:
Quoting HAWK21M (Reply 3): If the Noise existed mainly when moving,I would say Brakes.
If it's the brakes, it specifically may be slack coming out of the torque rods. The brakes have some free-play about the axles, and react their torque through a rod connecting the two brakes (or the brake to the bogey, depending on the specific design). I can imagine you get a steel-on-steel "clank" when those first take up.