Hammer From United States of America, joined Jul 2001, 687 posts, RR: 2 Posted (8 years 8 months 6 hours ago) and read 13793 times:
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....
Theredbaron From Mexico, joined Mar 2005, 2106 posts, RR: 6
Reply 10, posted (8 years 7 months 4 weeks 1 day 15 hours ago) and read 9729 times:
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..!
Ahdharia From United States of America, joined May 2004, 81 posts, RR: 0
Reply 15, posted (8 years 7 months 4 weeks 1 day 10 hours ago) and read 6724 times:
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.
Lightsaber From United States of America, joined Jan 2005, 12318 posts, RR: 100
Reply 17, posted (8 years 7 months 4 weeks 1 day 9 hours ago) and read 5542 times:
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!
PhilSquares From , joined Dec 1969, posts, RR:
Reply 20, posted (8 years 7 months 4 weeks 1 day 1 hour ago) and read 3974 times:
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.