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.
(..) ..where she landed at in the morning of April , ,... ..after her long fall... ..from the world above. You are so full of shit, boss ! (mechanical whirring) (sonar pinging) Dive six - here we are again on the deck of Titanic. / miles down, meters. The pressure outside (..)1997 Titanic
(..) Okay. Take her up and over the bow rail. Okay, Mir , we're going over the bow. Stay with us. (sonar pings) (mechanical whirring) Okay, quiet. We're rolling. Seeing her coming out of the darkness like a ghost ship... ..still gets me every time. To see the sad ruin (..)1997 Titanic