hammer
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NWA 747 Breaks Main Gear

Thu Jul 21, 2005 9:34 am

This afternoon flight 25 A/C#6304, bound for Tokyo, broke the right (center) main gear. It was getting pushed back from the gate and as they were turning it during pushback, a support bar broke and the gear twisted and shreaded 2 tires....they had to off load the passenger, fuel..etc...to get the weight off of it so they could tow it back to the gate...it blocked gate 24 for about 2 hours, it is back at the gate and will be going to the hangar for repairs....
 
as739x
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RE: NWA 747 Breaks Main Gear

Thu Jul 21, 2005 9:39 am

Bound from NRT from? Not a lot of info for those without access to airline computers!

For those wondering/
Flight #25 DTW-NRT-PVG
Dept. Time scheduled.. 235p

ASSFO

[Edited 2005-07-21 02:39:37]
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centrair
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RE: NWA 747 Breaks Main Gear

Thu Jul 21, 2005 9:40 am

WOW. That is not good. That was at DTW right?
Must have been hell. Any pictures?
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AsstChiefMark
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RE: NWA 747 Breaks Main Gear

Thu Jul 21, 2005 9:41 am

Did you throw the passengers onto a couple of spare 753's or DC-10's so they could get where they're going? Or were they stranded?

Mark
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hammer
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RE: NWA 747 Breaks Main Gear

Thu Jul 21, 2005 9:42 am

to NRT and yes here in DTW
 
AsstChiefMark
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RE: NWA 747 Breaks Main Gear

Thu Jul 21, 2005 9:45 am

Ooops... I see NWA25D is a 744 in the air.

Mark
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hammer
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RE: NWA 747 Breaks Main Gear

Thu Jul 21, 2005 9:49 am

they were placed on another 747-400 A/C#6307 and are on there way...
 
TGV
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RE: NWA 747 Breaks Main Gear

Thu Jul 21, 2005 12:55 pm

Can we assume it is this kind of incident that leads to have this type of tests for new aircraft ?
A380 Main Landing Gear (by Liedetectors Jul 21 2005 in Civil Aviation)
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HAWK21M
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RE: NWA 747 Breaks Main Gear

Thu Jul 21, 2005 5:49 pm

Probably a Sheared LG Pin weakened in a Prior "Unreported Heavy" landing.
Any Pics.
regds
MEL
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Vikingair
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RE: NWA 747 Breaks Main Gear

Thu Jul 21, 2005 10:18 pm

Could be that the body gear steering locked up.
 
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TheRedBaron
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RE: NWA 747 Breaks Main Gear

Fri Jul 22, 2005 12:23 am

At the risk of repeating myself I guess NWA must go to Louisiana, Catemaco (Mexico), Port au Prince (Haiti) to get those pesky jinxes and bad luck removed, they have more than enough land misshapps to garantee the work of a wizard, chamman or vodoo doctor..!
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kappel
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RE: NWA 747 Breaks Main Gear

Fri Jul 22, 2005 1:59 am

Quoting HAWK21M (Reply 8):
Probably a Sheared LG Pin weakened in a Prior "Unreported Heavy" landing.
Any Pics.
regds
MEL

That must have been some heavy landing!!!! Does this kind of stuff happen often? It's the first time I've heard of a landing gear breaking off. (though, that's not saying much)
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BWI757
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RE: NWA 747 Breaks Main Gear

Fri Jul 22, 2005 2:38 am

Kappel,

Quoting Hammer (Thread starter):
It was getting pushed back from the gate and as they were turning it during pushback, a support bar broke and the gear twisted and shreaded 2 tires..
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hammer
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RE: NWA 747 Breaks Main Gear

Fri Jul 22, 2005 2:38 am

It didn't break off, it was twisted sideways...and it does not happen often at all...
 
boeing764
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RE: NWA 747 Breaks Main Gear

Fri Jul 22, 2005 2:41 am

For those of you that go by the aircraft registration Northwest's aircraft #6304 is N664US

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ahdharia
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RE: NWA 747 Breaks Main Gear

Fri Jul 22, 2005 4:54 am

The flight status shows that NWA #25 departed on-time from DTW - NRT at 2:30pm. How did they move pax to a different aircraft and still have an on-time departure?
Also I dont think they have spare 744's in DTW.
 
hammer
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RE: NWA 747 Breaks Main Gear

Fri Jul 22, 2005 5:37 am

A/C#6307 came in from a different city and was due to overnight in DTW, when 6304 broke, they switched it....it left at 6:43 p.m...not 2:30....
 
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lightsaber
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RE: NWA 747 Breaks Main Gear

Fri Jul 22, 2005 6:48 am

Quoting TGV (Reply 7):
Can we assume it is this kind of incident that leads to have this type of tests for new aircraft ?

True! Most testing is required to keep from repeating prior mistakes.

Quoting HAWK21M (Reply 8):
Probably a Sheared LG Pin weakened in a Prior "Unreported Heavy" landing.

Most likely the root cause.

Quoting Kappel (Reply 11):

That must have been some heavy landing!!!! Does this kind of stuff happen often?



Quoting Hammer (Reply 13):
It didn't break off, it was twisted sideways...and it does not happen often at all...

Twisting/breaking is very vary rare. Shearing the pins... isn't unheard of. Not common, but not rare. In the 747 family of aircraft the pins are made from a steel that is a bit more fracture sensitive than is ideal for such a "shock loaded" application. Obviously the 747's incredibly good safety record speaks for itself, so this isn't something to worry about (unless your the mechanic).

When I read about this on a.net I walked out to our B742 and stood under the gear imagining how the hell could that massive center gear break? As I stood there a fellow engineer came up and asked why I was standing in an odd area... He noted (after I explained this NW incident) that when he had worked, in a past life, landing gear replacement they once had a B744 come in with three pins sheared on one of the center landing gear legs! (Out of six pins.) Yikes!

Lightsaber
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kappel
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RE: NWA 747 Breaks Main Gear

Fri Jul 22, 2005 8:20 am

BWI757,

Quoting BWI757 (Reply 12):
Kappel,

Quoting Hammer (Thread starter):
It was getting pushed back from the gate and as they were turning it during pushback, a support bar broke and the gear twisted and shreaded 2 tires..

I made the remark of the heavy landing because of this post:

Quoting HAWK21M (Reply 8):
Probably a Sheared LG Pin weakened in a Prior "Unreported Heavy" landing.
Any Pics.
regds
MEL

I know it couldn't have happned just because of push-back, what kind of toy-landing gears would that have been!?
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HAWK21M
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RE: NWA 747 Breaks Main Gear

Fri Jul 22, 2005 1:36 pm

So any Update to the cause.
regds
MEL
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PhilSquares
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RE: NWA 747 Breaks Main Gear

Fri Jul 22, 2005 1:53 pm

Quoting Hammer (Reply 16):
Quoting HAWK21M (Reply 8):
Probably a Sheared LG Pin weakened in a Prior "Unreported Heavy" landing.

Most likely the root cause.

Doubt if it was an "unreported heavy" landing. The 747-400 and other newer generation aircraft have a Central Maintence Computer. Works great and has all sorts of interesting info contained in it. One of them is the landing exceedence report. If there is a heavy landing it will spit out a report via acars and everyone in the world will know. So, I rather doubt alleged unreported heavy landing was the root cause.
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NZ1
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RE: NWA 747 Breaks Main Gear

Fri Jul 22, 2005 8:33 pm

Quoting Vikingair (Reply 9):
Could be that the body gear steering locked up.

Not likely. We tow 744's all the time with B/G steering off, system 1 not running, and have never had a problem.

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HAWK21M
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RE: NWA 747 Breaks Main Gear

Sat Jul 23, 2005 2:12 am

Quoting PhilSquares (Reply 20):
One of them is the landing exceedence report. If there is a heavy landing it will spit out a report via acars and everyone in the world will know.

Manythings are known only to Mx  Smile
regds
MEL
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