Toronto place crash 4

[LittleInch]

A Delta plane appears to have touched a wing tip during landing, ripped the wing off then promptly flipped over onto its back.

As they were on the airfield and this time didn't run into anything or catch fire, everyone is alive, though not surprisingly some injuries.

All passengers survive crash landing as plane flips at Toronto airport

Eighteen of the 80 people on board were injured after the Delta plane overturned on landing.

www.bbc.co.uk

This video https://www.dailymail.co.uk/news/article-14407855/delta-plane-crash-toronto-fireball-footage.html makes it look like a very hard landing - no visible flare

 

[SWComposites]

Those are not fuel lines. On CSeries the engine is wing mounted, so the fuel lines are in the main box fuel tank, then go down the pylon to the engines.

 

[Sym P. le]

The right wing buckled at the fuselage, the right gear was a fulcrum!!!! In the first five frames, you can see the left and right wingtips (both are easily tracked by the video frame rate), right wing low to accommodate the crosswind. Upon touchdown with the right gear, the left wingtip moves down as the plane levels and puts down the left gear. After Frame 6, the right wingtip suddenly vanishes but the right gear is still visible. This is from the wingtip snapping up as the weight of the fuselage whips it upwards using the still visible right gear as a fulcrum. In fact the right gear is still visible through Frame 9. The right wingtip is seen again in Frames 12 and 13 level with the top of the fuselage.

If this is so, they should find no initial ground contact damage on the recovered wing tip.





Edit: the wingtip is charred but physical damage is unclear.


Youtube - 11Alive

 

[Sym P. le]

 

[Sym P. le]

Gratuitous 3D - crosseyed (with images from Youtube WBIR Channel 10)

 

[TugboatEng]

The one thing to notice about this crash is that we have the data recorders, we have the airframe, we have the witnesses, we have video (why were those pilots recording this specific flight?), yet somehow this is going to be one of the most delayed investigations.

 

[Tomfh]

No surprise with DEI dominating the headlines. A massive amount of time will be spent getting ducks in a row—far beyond the usual scope of an air crash investigation.

 

[Alistair_Heaton]

I would like to see that interface point between the wing spar and box. In the past there has been failures due to corrosion in that region.

It might turn out that this heavy landing is a blessing in disguise causing failure and no fatalities.

 

[Sym P. le]

Here is a better representation of what I believe the crash video shows. This theory requires both the main spar and side brace linkage to break. What does not happen though is the right wing striking the ground nor the right gear punching through the wing, rather it remains propping up the broken wing. This does not address the transmission of forces causing the break.

 

[DirteJoe]

I believe you'e correct in your representation.

 

[LittleInch]

My money is still on a hard landing which has burst what looks like the outer tyre resulting in some sort of main landing gear collapse and the right wing tip digging into something and with the momentum of the plane plus what could be some damage from the landing gear collapse, ripping the wing off.

The issue I guess is for them to figure out cause from effect.

 

[DirteJoe]

If the wing tip hit hard enough to cause the wing to break off, I'm sure we'd be seeing more damage to the wing tip. It looks fairly intact and not bent up, which Id suspect it may be. Unless the wing was holding on with hopes and prayers prior to the hard landing.

 

[Sym P. le]

My money is still on ...

Did you watch the video?

 

[Sym P. le]

If the wing tip hit hard enough to cause the wing to break off ...

Yes, that relatively small and fragile tip was never a likely cause of tearing off the entire wing from the root.

 

[DirteJoe]

Yes, that relatively small and fragile tip was never a likely cause of tearing off the entire wing from the root.

Only perhaps if more of the wing hit say a snow bank after landing off center, but I doubt thats the case as well.

 

[Sym P. le]

I find it hard to explain landing gear not swinging upwards immediately upon impact.

Net forces will inherently keep the gear deployed under the wing.

 

[TugboatEng]

A B737 had a similar nose down landing some years ago. It collapsed the nose gear. We also see the nose gear collapsed in this flight.

Southwest Airlines Flight 345 - Wikipedia

en.m.wikipedia.org

 

[DirteJoe]

Nose gear appears to have not collapsed.

 

[TugboatEng]

Shoot, it looked bent to the side in another picture. All of the snow doesn't help interpretation.

 

[TugboatEng]

This is the picture that gave an illusion of bent gear. Maybe it is. The locking mechanism doesn't look right.

 

[LittleInch]

SymP le.

YesI watched the video several times, I just have a different interpretation than you. The right wing tip for me vanishes and the damage on the root of the wing is important. If say the locking strut actually broke through the wing attachment, it left very little for the wing not to break off so there may be not much damage to the wing tip.

We are speculating without all the data, reports and not examining the debris left.

Tug, the front gear has the hinge at the back and what you're looking at I think is the steering mechanism.