That plane in the river was still intact, passengers survived, no one hurt, so it's all in the landing skills of the pilot, and again weight has nothing to do with it, but it is likely that if terrorism is present, then the terrorist or highjacker pilots would not possess such skills maybe, but who knows really ?Weight has nothing to do with it... It is all in the approach, and the way you land the aircraft..
You must be kidding. Show me where a jumbo jet has landed on a grass airstrip, and I'll show you a wreck.
It depends on your insurance. Clubs or individuals have rules against landing on grass or gravel. When you have a million dollar plane, you don't want people to land on something that isn't a sure thing. If you have a million dollar plane, you can land it wherever you want but other people won't lend it out.
I don't know what the center of gravity would be for a large plane like a 747 or 777.
A large plane like that needs a mile to land. Where are you going to find a mile of flat or even grass?
Let's say that the gear on your airplane won't extend. You've tried everything and nothing works. You've even tried the thing you do in your doctor's office during your medical exam: you jumped up and down on one foot for 20 seconds directly over the main gear attempting to dislodge the recalcitrant assembly (didn't know that was a standard in-flight maneuver, did you?). The gear won't extend and now you must land. Should you make the gear-up landing on the runway or on the grass (i.e. sod, dirt, etc.) next to the runway?
Here's the answer, short and sweet. Statistics suggest that putting the airplane on the asphalt is likely to cause less damage to you and your airplane than putting it on the grass.
Gear-up Landings - Asphalt or Grass? - Flight Training
This counters the major soft-field bugaboo the tendency of the nosewheel to dig in on a soft landing surface, with results that can be unpleasant.
- Flight Training