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KLM 747 Suffers Landing Gear Damage  
User currently offlineKC135Hydraulics From United States of America, joined Nov 2012, 305 posts, RR: 0
Posted (1 year 10 months 2 weeks 5 days 13 hours ago) and read 19325 times:

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.

17 replies: All unread, jump to last
 
User currently offlinegr325 From Netherlands, joined Jan 2002, 715 posts, RR: 0
Reply 1, posted (1 year 10 months 2 weeks 5 days 12 hours ago) and read 19225 times:

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"
User currently offlineKC135Hydraulics From United States of America, joined Nov 2012, 305 posts, RR: 0
Reply 2, posted (1 year 10 months 2 weeks 5 days 12 hours ago) and read 19171 times:

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.

User currently offlinejetmech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 3, posted (1 year 10 months 2 weeks 5 days 12 hours ago) and read 19136 times:

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



JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlinejetmech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 4, posted (1 year 10 months 2 weeks 5 days 12 hours ago) and read 18947 times:

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



JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlinegarpd From UK - Scotland, joined Aug 2005, 2654 posts, RR: 4
Reply 5, posted (1 year 10 months 2 weeks 5 days 5 hours ago) and read 18215 times:

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.



arpdesign.wordpress.com
User currently offlinekc135hydraulics From United States of America, joined Nov 2012, 305 posts, RR: 0
Reply 6, posted (1 year 10 months 2 weeks 5 days 5 hours ago) and read 18143 times:

Thanks for the extra close up pictures! Maybe the side strut broke at a mount and allowed the truck/strut to rotate under load.

User currently offlineushermittwoch From Germany, joined Jan 2004, 2965 posts, RR: 16
Reply 7, posted (1 year 10 months 2 weeks 5 days 3 hours ago) and read 16585 times:

LOL. So even during maintennance AF doesn't clean their planes.  


Where have all the tri-jets gone...
User currently offlinePlane Holland From Netherlands, joined Oct 2000, 453 posts, RR: 0
Reply 8, posted (1 year 10 months 2 weeks 5 days 3 hours ago) and read 16456 times:

Quoting ushermittwoch (Reply 7):

AF? Since when does AF do maintenance on a KL 747.. And you know the weather in The Netherlands right?


User currently offlineushermittwoch From Germany, joined Jan 2004, 2965 posts, RR: 16
Reply 9, posted (1 year 10 months 2 weeks 5 days 3 hours ago) and read 16456 times:

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...
User currently offlineKC135TopBoom From United States of America, joined Jan 2005, 12146 posts, RR: 51
Reply 10, posted (1 year 10 months 2 weeks 5 days 2 hours ago) and read 15914 times:

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.

User currently offlineyeelep From United States of America, joined Apr 2011, 659 posts, RR: 0
Reply 11, posted (1 year 10 months 2 weeks 5 days 1 hour ago) and read 14907 times:

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.

User currently offlineDTWLAX From United States of America, joined Aug 2009, 794 posts, RR: 0
Reply 12, posted (1 year 10 months 2 weeks 5 days ago) and read 12957 times:

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


User currently offlinemusang From United Kingdom, joined Apr 2001, 864 posts, RR: 7
Reply 13, posted (1 year 10 months 2 weeks 4 days 19 hours ago) and read 8266 times:

Is this it?

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

Regards - musang


User currently offlinePlane Holland From Netherlands, joined Oct 2000, 453 posts, RR: 0
Reply 14, posted (1 year 10 months 2 weeks 4 days 18 hours ago) and read 7261 times:

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  


User currently offlinezkokq From Australia, joined Mar 2012, 477 posts, RR: 0
Reply 15, posted (1 year 10 months 2 weeks 4 days 7 hours ago) and read 3599 times:

Quoting KC135TopBoom (Reply 10):

I would say they did get a warning, but they have to land eventually.


User currently offlineyeelep From United States of America, joined Apr 2011, 659 posts, RR: 0
Reply 16, posted (1 year 10 months 2 weeks 4 days 3 hours ago) and read 3386 times:

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]

User currently offlineAZA330 From Italy, joined Feb 2004, 289 posts, RR: 0
Reply 17, posted (1 year 10 months 2 weeks 2 days 18 hours ago) and read 2430 times:

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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