"With the landing gear torn off the wing main spar will be severely damaged"
The landing gear wasn't torn off because it was retracted at the time so I doubt that there will be serious damage to the wing spar.
From the pictures I've seen it looks repairable to me - and I say again from the pictures I've seen. The damage looks minimal from the photos and I wouldn't have thought there would have been much structural damage but thats purely speculation.
The biggest problem will be getting it the 1.5k to the airport or however far it is.
There have been other a/c with similar looking damage that have been repaired but it all depends on the a/c's value against the cost of the repairs though.
"10 seconds before ground contact "Mayday-Announcement"...pretty late..."
How early would you expect it then if they didn't think they had a problem ??.
Lets not forget that the a/c was on final approch into MUC
so they were flying low and slowly and decending so they probably didn't realise they were in trouble until it was too late - a bit like the BD
737 that crashed onto the M1. They too thought they would make the airfield until they tried to give the engine a bit of power and it failed causing them to crash - too late to do anything about it. I imagine that the pilot hit the wrong switch in the panic in the final few seconds and made the "mayday" call into the cabin by mistake or at the same time as the radio to give the people in the cabin a few seconds to do something. The capt of the BD
737 shouted "brace brace" into the cabin about 3 seconds before the first impact with the ground which was even later.
"after that engine shutoff...which takes always one or two minutes after a planes taxied to it's gate...with 8 secs left...I don't know..."
It does not take 1-2 minutes for an a/c engine to shut down (they sometimes have to run the engines for a couple of minutes before they shut them down if it is only a short taxi from the runway). It takes about 30 seconds max for the engine to wind down, but if you are going to crash and you know you have no options then it is usual when there is time to shut the engines off before impact to stop the fuel flow that could lead to a fire.
Just glad they all got out with no deaths or injuries.
"She Rolls, 45 knots, 90, 135, nose comes up to 20 degrees, she's airborne - She flies, Concorde Flies"