Knocking sound during taxi on 777 (Q from pax)

[Tickle]

Hi all,

Recently on a trip from Vietnam to Australia on a 777 there was a very loud knocking sound during the taxi to the runway coming from right under where we were seated, just after of the starboard wing and I was next to the window.

I haven't flown much but this caused me a little unease as I have been in an aircraft accident in the past. The flight went without any issues but I do wonder what the sound was.

I seem to recall something about brakes. I couldn't pinpoint any particular movement that triggered it.

Just wonder if that's normal and would like to know what causes it?

Thanks,

Andrew.

[SuperRanger]

if i had to guess, i'd say it's the taxiway centerline lights? these are more pronounced at the front (nose wheel) but can happen to the main gears too, during turns.

SR

[dkaarma]

Maybe something similar to this
http://www.pprune.org/forums/showthread.php?t=111828

[FlyguyXX]

Maybe it was the same aircraft I was on from HAN-SGN as first part of flight to SYD. It was a Vietnam Airlines 777 and I noticed the banging noise during push back and taxiing... just a little unnerving as you like to think it's meant to sound like that. I was seated on the right hand side over the wing and it was one of the 777 they have that has 2-5-2 seating.

[Old Smokey]

What Tickle and FlyguyXX have experienced on the B777 is completely normal, it's heard on every flight.:ok:

It's the linkage of the main gear steering clunking about during taxy manoeuvres, particularly noticeable during push-bacl.

The only time that you won't hear it is when it's locked out, and the triple bogey becomes rigid, then you hear a lot of rubber screeching on the tight corners instead:ooh:

Regards,

Old Smokey

[ACMS]

Some of our 777's get a clunking noise in the nose gear area, Engineering are told but never quite seem to fix it ( spin check the nose wheels, re-torque the what's its, check the whole nose bay area and sometimes even replace the wheels. )

I think it's the oleo reaching full extension, they don't agree. Meantime the noise continues !!

[Papa2Charlie]

Hi all,

Is the "clunking" or "banging" noise heard on A320 / A330 aircraft during taxi caused by the same thing? I had a suspicion it might be caused by the parking brake being applied & removed?

Cheers,

John

[ground_star]

Newbie Ramp agent stuck in the hold? Got shut in there as an initiation ritual?? ;)

[HOVIS]

Does the 777 have a PTU like the 320?

is that it?

[ShyTorque]

In view of the recent Heathrow accident it might just be the sound of the captain's knees.