Southwest KLGA gear collapse.
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If you smash the front landing gear into the ground, and the wheel is wrenched off its axle, then it's still moving at the same speed as the wreckage, and will quickly spin up to roll off only a little slower than the wreckage.
If it's not wrenched off its axle, then the energy that would have spun it up (and then some) will be dumped into the broken bearings.
Seeing rolling debris eventually overtake the bulk of the wreckage is par for the course.
If it's not wrenched off its axle, then the energy that would have spun it up (and then some) will be dumped into the broken bearings.
Seeing rolling debris eventually overtake the bulk of the wreckage is par for the course.
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Friend just forwarded this to me:
Guys, here is a comment from another message board from a crew member on a taxiway with a front row seat of what happened:
"Here is what I saw. We were on taxiway B short of CY abeam the
AA hangar. We were around 2000 ft from the runway end and had a
complete view of the first 2000 ft of the runway. WN seemed high
crossing the threshold and was around 20-30 ft above the 1000ft
marker when they flared and ballooned even higher. At this point
the three of us thought he was going around until he pushed the
nose over. I will admit it was such a hard pushover that even
before he hit the ground at the 1500 ft marker, nose gear first
(barley before the underside of the AC nose hit I yelled Holy
S**t. I believe after the pushover someone tried to get the nose
back up but it was a lost cause. The fact the AC stayed in one
piece is amazing. The nose gear looked like it was on a shock
disappearing back into the wheel well. The left engine hit first
and the AC started sliding left. It was pure luck that no one
was hurt, as the area it came to a stop in had a few minutes
earlier been full of AC taxiing."
Guys, here is a comment from another message board from a crew member on a taxiway with a front row seat of what happened:
"Here is what I saw. We were on taxiway B short of CY abeam the
AA hangar. We were around 2000 ft from the runway end and had a
complete view of the first 2000 ft of the runway. WN seemed high
crossing the threshold and was around 20-30 ft above the 1000ft
marker when they flared and ballooned even higher. At this point
the three of us thought he was going around until he pushed the
nose over. I will admit it was such a hard pushover that even
before he hit the ground at the 1500 ft marker, nose gear first
(barley before the underside of the AC nose hit I yelled Holy
S**t. I believe after the pushover someone tried to get the nose
back up but it was a lost cause. The fact the AC stayed in one
piece is amazing. The nose gear looked like it was on a shock
disappearing back into the wheel well. The left engine hit first
and the AC started sliding left. It was pure luck that no one
was hurt, as the area it came to a stop in had a few minutes
earlier been full of AC taxiing."
I agree that the cause of this accident was most likely a hard, nose-first landing but I can't see how anyone can say this for sure from the video.
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Landing on the nose gear was not good. It is not designed for initial touchdown. Everybody knows a 737 can not land on the nose gear and not break off. It is not designed for that. We all know that so never did.
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"The FAA said the flight 'reported possible front landing gear issues before landing.'"
Southwest Plane Hauled from LaGuardia Runway After Landing Gear Collapse | NBC New York
Southwest Plane Hauled from LaGuardia Runway After Landing Gear Collapse | NBC New York
Well there you have it.
They can run but they can't hide.
Seems its not only Indian A320's that land nose wheel first then..
Like I said before-------lucky they didn't hit another Aircraft.......
They can run but they can't hide.
Seems its not only Indian A320's that land nose wheel first then..
Like I said before-------lucky they didn't hit another Aircraft.......
Last edited by nitpicker330; 25th Jul 2013 at 03:24.
Join Date: May 2005
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Okay, I'm sure there are important flight safety issues here, evacuation, training, magenta mirage, etc. But so far we are all missing something critical...
Someone has _got_ to teach that guy how to download a video from his tablet rather than videotaping the tablet playing the video.
Someone has _got_ to teach that guy how to download a video from his tablet rather than videotaping the tablet playing the video.
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Originally Posted by Sky Wave
The rear slide angle and the wing at flap 30 with an unusual nose attitude must have injured people during the evac.
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Boeing nosegears are built like the proverbial brick outhouses.
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As we also learned in Asiana 214 News briefings, landing gear assemblies are frangible. They are designed to break in specific places when overstressed to avoid more excessive damage to surrounding structures. In the case of the 777 the main landing gear shearing off probably saved fuel tank integrity and prevented a fuel-fed fire.
In this case I'm not sure how the wheel itself could roll along as it is seen in the one video, when the gear strut was pushed up into the avionics bay. To me the bouncing wheel seemed bigger than a nosewheel (but I agree it is hard to judge without any reference), but in the photos of the aircraft at rest one can see all 4 main gear wheels attached.
Question for 737-7xx pilots: what is the clearance of the engine nacelles with the nose gear completely collapsed? I looked at some drawings of the (slightly longer) -800 and it seems to be very little (if any). So given the shorter length and some compression of the main landing gear on "touchdown" I assume the answer is "less than zero", i. e. the nacelles are expected to scrape in this case.
Would one expect engine damage from scraping the front portion of the nacelle like that or would the air inlet just deform and protect the engine proper?
Bernd
In this case I'm not sure how the wheel itself could roll along as it is seen in the one video, when the gear strut was pushed up into the avionics bay. To me the bouncing wheel seemed bigger than a nosewheel (but I agree it is hard to judge without any reference), but in the photos of the aircraft at rest one can see all 4 main gear wheels attached.
Question for 737-7xx pilots: what is the clearance of the engine nacelles with the nose gear completely collapsed? I looked at some drawings of the (slightly longer) -800 and it seems to be very little (if any). So given the shorter length and some compression of the main landing gear on "touchdown" I assume the answer is "less than zero", i. e. the nacelles are expected to scrape in this case.
Would one expect engine damage from scraping the front portion of the nacelle like that or would the air inlet just deform and protect the engine proper?
Bernd
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In this case I'm not sure how the wheel itself could roll along as it is seen in the one video, when the gear strut was pushed up into the avionics bay.
I'd say the smart money is on it becoming detached on impact as it is much more likely to have become trapped in the well once the nose was down.
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FWIW: if you go back to the picture of the E1 rack (front of the avionics bay)
http://www.pprune.org/rumours-news/5...ml#post7956851
On the top row the 4th box over (1st box is silver with blue label) is the Flap/Slat electronics unit. On the 2nd row the 1st box is the anti-skid/ auto brake box.
Quite possible after being impaled by the nose gear these systems were not operating correctly. May be why the plane went off the runway and why the evacuation checklist appears not to have been completed.
http://www.pprune.org/rumours-news/5...ml#post7956851
On the top row the 4th box over (1st box is silver with blue label) is the Flap/Slat electronics unit. On the 2nd row the 1st box is the anti-skid/ auto brake box.
Quite possible after being impaled by the nose gear these systems were not operating correctly. May be why the plane went off the runway and why the evacuation checklist appears not to have been completed.
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The agency had been considering not investigating the incident further, but decided on Tuesday it required further scrutiny. The accident occurred at 5:45 pm local time as Southwest's Flight 345 arrived at LaGuardia from Nashville.
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Am I the only one staggered by the above statement?
