I agree with Cryogenic. If you say 'port nacelle' when you mean 'starboard nacelle', that's a mistake. 'located behind the aft nacelle' is... I dunno what. But those sorts of maddening errors that seem less like simple mistakes and more like lazy technobabble from writers who don't care are the antimatter that fuels our collective nerd-rage. And that's why we're here. Stuff like that just shouldn't happen. I think I'll head down to engineering for a beer.