Please describe your role in this item on your resume that says, ‘Developed jet turbine engine.’

Oh, you mean your summer job was actually to run the creep rupture tests on several candidate alloys that were developed by someone else and designed by someone else?

Don't inflate the importance of what you, yourself, did beyond the boundaries of your actions. There is hardly anything more embarrassing than being pinned to the interview table like a bug in an insect collection by someone who knows what goes into the design of a complex metal part. You can show that you understand how your role fit into the whole project, but don't pretend that you did all the work.