checking the mission files i found missing dialogs with the hangar man... i'm trying to enable them... done... i don't know if the hangar guy's items do anything... but at least u have new dialogs
Now about the landing problem... u'll have to land exactly in the center of the crater... and very gently... if you see that your ship star to sink take of a little and then land... i found the sweet spot in my second attemp...