He's a 'mechanical' genius. [=he is a person who is very smart about machines]
He's not 'mechanically' inclined. [=he is not knowledgeable about machinery]
The flight was delayed because of 'mechanical' problems/difficulties.
(..) I'm gonna put you out of your misery. Helicopters approaching Mr. Sellers boards first. No, no. Mrs. Murphy. You and your son can get on first. Officer down, mechanical room, Omnicorp Building. Roger that, EMS on the way. You're going to be okay Jack. Non fatal. Go, go! (..)2014 RoboCop