KC135Hydraulics
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KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 2:15 am

Hey everyone,

This is my first post so I hope it goes well! I did a search but did not find anything on this. According to JACDEC, a KLM 747 landed with it's right inboard landing gear truck tilted to a side. It dragged it down the runway and caused some damage. Here is a link to the story:

http://avherald.com/h?article=458582a9&opt=0

I haven't seen this one before, it does look worthy of comment.
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gr325
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 2:44 am

In my opinion it looks like the landing gear did not extend properly.

https://pbs.twimg.com/media/A6m8ptbCYAE0v8o.jpg
"You should have gone to specsavers"
 
KC135Hydraulics
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 2:53 am

I do know that the back two trucks can be steered. Maybe it was a failure of the mechanism that keeps the gear locked forward when the steering is disabled? Without knowing exactly how the 747's MLG operate it's purely a guess.
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jetmech
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 2:57 am

Quoting KC135Hydraulics (Thread starter):

The article states that the body gear truck was twisted about 45 degrees out of alignment. According to Boeing, the maximum steer angle for the body gear is 13 degrees, and I would imagine that the system is not physically capable of much more movement than that.

http://www.boeing.com/commercial/airports/acaps/7474sec4.pdf

Regards, JetMech
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jetmech
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 3:35 am

Quoting gr325 (Reply 1):

Nice photo! Reposted here from the link you so kindly posted.

Quoting gr325 (Reply 1):
In my opinion it looks like the landing gear did not extend properly.

To me, it looks like the gear did extend properly. I suspect that the bottom scissor link somehow detached from the upper scissor link, which consists of the two steering cylinders.

http://forums.pelicanparts.com/uploads11/BodyGear+s1195678426.jpg
http://forums.pelicanparts.com/uploads11/BodyGear+s1195678426.jpg

Perhaps the truck then became mechanically jammed at the angle we see in the photo?

Regards, JetMech
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garpd
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 10:03 am

Quoting gr325 (Reply 1):
In my opinion it looks like the landing gear did not extend properly.

If this had been an Airbus, I'd have just said "figures"   

I have never seen this on a 747 though as the gear does not twist when retracted or extended. As you can see in this video: http://www.youtube.com/watch?v=ChPLaXqO0eQ The gear just tucks away without any twisting, shifting or such.
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KC135Hydraulics
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 10:18 am

Thanks for the extra close up pictures! Maybe the side strut broke at a mount and allowed the truck/strut to rotate under load.
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ushermittwoch
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 12:06 pm

LOL. So even during maintennance AF doesn't clean their planes.  
Where have all the tri-jets gone...
 
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Plane Holland
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 12:14 pm

Quoting ushermittwoch (Reply 7):

AF? Since when does AF do maintenance on a KL 747.. And you know the weather in The Netherlands right?
 
ushermittwoch
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 12:15 pm

Quoting Plane Holland (Reply 8):
AF? Since when does AF do maintenance on a KL 747.. And you know the weather in The Netherlands right?

Watch the video. For clarification.
Where have all the tri-jets gone...
 
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kc135topboom
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 12:44 pm

The only way this could happen is if somehow the body gear attachment points to the body was damaged, and then failed after the gear was extended, or the sissor joint strut broke and it twisted on the oleo. The crew should have gotten an unsafe gear indication.
 
yeelep
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 1:47 pm

I would speculate the outboard steering actuator fractured, allowing the inner cylinder to rotate. In the above picture, just below where the inner cylinder exits the outer, it looks like the end of the broken actuator is dangling.
 
DTWLAX
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 3:34 pm

Quoting ushermittwoch (Reply 7):
LOL. So even during maintennance AF doesn't clean their planes.

Nice catch  
Quoting Plane Holland (Reply 8):
AF? Since when does AF do maintenance on a KL 747.. And you know the weather in The Netherlands right?

He is talking about the plane in the youtube video... not the KLM747 that had the incident. The youtube video showing the landing gear tests is a AF plane
 
musang
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 8:19 pm

Is this it?

http://www.youtube.com/watch?v=sSmCb1M6Ysk

Regards - musang
 
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Plane Holland
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RE: KLM 747 Suffers Landing Gear Damage

Sat Nov 03, 2012 9:25 pm

Quoting DTWLAX (Reply 12):

He is talking about the plane in the youtube video... not the KLM747 that had the incident. The youtube video showing the landing gear tests is a AF plane

Sorry, my bad... Stumbling upon the one German that does have humor  
 
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zkokq
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RE: KLM 747 Suffers Landing Gear Damage

Sun Nov 04, 2012 9:03 am

Quoting KC135TopBoom (Reply 10):

I would say they did get a warning, but they have to land eventually.
 
yeelep
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RE: KLM 747 Suffers Landing Gear Damage

Sun Nov 04, 2012 12:19 pm

From the OP's referenced article, the flight crew called a mayday and requested the fire brigade during rollout. If they had an unsafe indication, wouldn't the fire brigade already be waiting for them to land?

[Edited 2012-11-04 04:21:52]
 
AZA330
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RE: KLM 747 Suffers Landing Gear Damage

Mon Nov 05, 2012 9:16 pm

I just found out today at work that my supervisor and my boss were on that flight. My boss actually had a picture similar to the one above (the wider view) on his phone. My supervisor said that he heard a noise during landing, similar to the noise you hear going too fast on a speed bump (so he said...) and then the plane stopped and the pilot came on to announce that they had a issue with the landing gear and that it caught on fire, but "now it is all-right." My supervisor could see three or four fire-trucks from the window, and they had to wait a little while before de-boarding.

Small world...

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