The original model by Sarod was in Lightwave. S-Stephen converted it to MAX and 3DS formats. This model is extremely good from some angles, and only slightly less in others. But it renders really quickly and smoothly, and this makes it perfect for detailed stills or animations.
S-Stephen created a simple but very effective landing gear add-on. It's even pre-animated to show it extending, including opening gear doors and folding-out legs. See it in action here.