Fly through all the sensors and when you come to the end of the canyon go take the left route. You should come to an Imperial outpost. A small movie will play pointing out the TIE. To capture it, simply kill the little black pilot running around. A blue rebel medal will appear. Fly into it so your craft will land. Now you will have the TIE. You will be able to cruise over the Academy with out being detected. Once you fire your weapons they will come after you......so beware. Go and capture the shuttle and complete the mission. YOU MUST DO IT IN DAY AND NIGHT TO GET THE TIE FIGHTER.
Spread proton bombs tech upgrade: the tech upgrade is located in the hangar opposite of where the daytime upgrade was found.