Go Back  PPRuNe Forums > Flight Deck Forums > Tech Log
Reload this Page >

Knocking sound during taxi on 777 (Q from pax)

Tech Log The very best in practical technical discussion on the web

Knocking sound during taxi on 777 (Q from pax)

Old 14th Apr 2008, 03:26
  #1 (permalink)  
Thread Starter
Join Date: Dec 2003
Location: Melbourne, Australia
Posts: 254
Received 16 Likes on 7 Posts
Knocking sound during taxi on 777 (Q from pax)

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?


Tickle is offline  
Old 14th Apr 2008, 03:45
  #2 (permalink)  
Join Date: Nov 2001
Location: KUL
Posts: 214
Likes: 0
Received 0 Likes on 0 Posts
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.

SuperRanger is offline  
Old 14th Apr 2008, 04:00
  #3 (permalink)  
Join Date: Apr 2007
Location: Australia
Posts: 48
Likes: 0
Received 0 Likes on 0 Posts
Maybe something similar to this
dkaarma is offline  
Old 14th Apr 2008, 04:45
  #4 (permalink)  
Join Date: Dec 2007
Location: New York
Posts: 15
Likes: 0
Received 0 Likes on 0 Posts
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.
FlyguyXX is offline  
Old 14th Apr 2008, 08:37
  #5 (permalink)  
Join Date: Jun 2004
Location: Australia
Posts: 1,843
Likes: 0
Received 0 Likes on 0 Posts
It's normal

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

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


Old Smokey
Old Smokey is offline  
Old 14th Apr 2008, 14:48
  #6 (permalink)  
Join Date: Jun 1999
Location: Oztrailia
Posts: 2,991
Received 14 Likes on 10 Posts
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 !!
ACMS is offline  
Old 14th Apr 2008, 15:21
  #7 (permalink)  
Join Date: Oct 2007
Location: Middle of Somewhere..
Posts: 203
Likes: 0
Received 0 Likes on 0 Posts
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?


Papa2Charlie is offline  
Old 14th Apr 2008, 15:58
  #8 (permalink)  
Join Date: Jan 2007
Location: Between EGAA, EGAC & the wilds of England
Age: 39
Posts: 99
Likes: 0
Received 0 Likes on 0 Posts
Newbie Ramp agent stuck in the hold? Got shut in there as an initiation ritual??
ground_star is offline  
Old 14th Apr 2008, 18:45
  #9 (permalink)  
Join Date: Sep 2001
Location: Blighty
Posts: 788
Received 87 Likes on 22 Posts
Does the 777 have a PTU like the 320?

is that it?
HOVIS is offline  
Old 15th Apr 2008, 07:16
  #10 (permalink)  

Avoid imitations
Join Date: Nov 2000
Location: Wandering the FIR and cyberspace often at highly unsociable times
Posts: 14,573
Received 415 Likes on 218 Posts

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

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.