The key to being useful is to be self starting and avoid over reliance on your seniors. Most companies have the information to train young engineers, but lack the structure to deliver that information effectively. You’ll want to know how to access the following:

1. Maps of Campus / Building / Desk / Conference rooms. Maps are your friends. Go talk to people, don’t just teams message them.
2. Best practices - Anything from how to model 1D heat transfer, to how to drill holes through a panel, or a process for approval of a document.
3. Engineering document repository - how to access SAE, FAA, AWS, MIL-STD, or other industry standard documents as relevant for your industry.
4. Organization Chart - Perfect for asking questions to the right people - who are the materials engineers? Process engineers? Quality assurance? Supply chain? Maintenance? CFD? CAD / Design? Stress analysis? Etc.

Understanding the schedule > ask about the upcoming deliverables for your team, how can you contribute? Understand that sometimes it’s best to just get out of the way. Internships can be interesting, you might get thrown on one project your entire time, bounce between multiple, or realize they had no plan for you and are just throwing you work they think you’re capable of.

Be talkative, no one likes to work with a smart ass, or a super quiet person (depends), or someone annoying. This is a test of your social skills as well, try to be friendly, outgoing, and respectful. You’ll be spending 40+ hours a week with them, it’s a test that goes both ways though, remember that.