Jetblue 292 landing 4

[Brian Malone]

Just recently saw this video of the Jetblue Flight 292 landing at LAX - January 2005. Maybe this has been discussed on the forum before, I did not get a find using the search option.

https://youtu.be/RgnkY4xzaZE

Actual plane touchdown occurs at ~4:00 - 4:05

https://en.wikipedia.org/wiki/JetBlue_Flight_292

I find the following quite amazing:
1. Skill of the pilots and flight crew to handle the situation and so carefully land the plane. That was a most ginger touchdown.
2. The structure of the nose gear. The loads and stress on the gear is tremendous under normal conditions; this most have been at the very extreme of the potential FMEA conditions considered.

 

[SWComposites]

re 2 - maybe not; LG are designed for some very high "hard landing" loads.

not the first time this kind of thing has happened.

 

[MintJulep]

https://safetyfirst.airbus.com/landing-with-nosewheels-at-90-degrees/

 

[Brian Malone]

SWComposites and MintJulep you are privy to parts and aspects of aircraft that are commonplace for you but make me marvel at the engineering that has gone into commercial aircraft and the materials and construction. The very detailed Safetyfirst/Airbus document definitely shows the jammed landing gear situation has happened a few times and the plane design and training have it covered. Still this must be a cheek-clinching situation for the pilot(s) to have to burn off fuel then ease the plane down to skid on the nose gear.

 

[SWComposites]

FYI, photo of 787 wing ultimate load test is here:

https://www.wired.com/images_blogs/autopia/2010/03/index1.jpg

So that little bit of wing deflection you might see going thru turbulence is small.

 

[Brian Malone]

SWComposites - amazing engineering of the aircraft and its structure, and the very test fixture and instrumentation. The team designing has the ability to predict behavior and verify - the numbers don't lie! This is an example of why I shake my head in disbelief when I hear people say high technology has been handed to us from 'alien tech' in Area 51. No the knowledge base is from years (decades) of hard work, observation and calculation.

 

[LittleInch]

The one that always amazed me is how the MAIN landing gear on I think its a Galaxy rotates 90 degrees as part of the lowering. I can't imagine the backups and fail safe systems that must have had.

And it has four units to rotate!

https://theaviationist.com/2014/02/09/video-galaxy-mlg-pov/

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[crackman]

Hi

This accident was due to fatigue failure of the anti-rotation lugs. This is one I have covered many times in our DTA course. This was actually missed because the fatigue loads on this part were not representative. The fatigue spectrum did not account for a large number of added cycles which were unknown to the structures guys. As part of the BSCU, the on board software performs tests of the gear prior to retraction. The BSCU software physically tests the NLG steering unit around a total of 57 cycles per flight. It was these added cycles over a long period of time that caused the fatigue failure of the fitting with the anti-rotation lugs and as a result the wheel castored and caused the incident. If you want to dig deeper, the NTSB docket contains full evaluations of the incident including metallurgical analysis. Just look it up on the NTSB docket under the NTSB No.: LAX05IA312.