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I did not realize that FS9 detected landing gear damage. I took off in a Dash-7 (Canadian ice patrol version) and discovered the right landing gear would not retract.
Figuring it would collapse on landing, I lowered the gear, touched down very gently, keeping the stick slightly left and the rudder slightly right. Just before the plane came to a stop, the damaged gear collapsed.
I wonder if FS9 detects when the passenger restrooms in the 747 malfunction.
I found that out the hard way when the whole gear collapsed on my 744 Virgin Atlantic flight from Heathrow (EGLL) to Washington Dulles. It was a soft landing but the gear just collapsed and I crashed. Was not impressed 
Not as bad as one version of Air Force One where the nose gear collapses just sitting on the runway. 
that happens to me alot especialy on the boeing 777-400 i was landing in SALT LAKE INTERNATIONAL and BOOOOOMMMMM!!!!!!! the front nose gear colllapsed and that was the end of my plane
I remember one time, late at night, I took off in a 747, I forgot to bring the gear up, and when I crossed 300 KIAS, it said, gear damaged. In order to land I had to switch 747s in mid-air. 
thats one thing i like is being able to switch aircraft in mid air
