There's nothing to teach here; the substance is just the answer key itself — Page 617, Lesson 717

This is the answers page for the Engine Instruments questions — a grid of correct letters, Q1 through Q52. There's nothing to teach here; the substance is just the answer key itself. So here's what we have: questions 1 through 52, with the correct option letter for each. I'll read them across in rows of twelve, the way they're laid out. Row one, questions 1 to 12: c, b, b, d, b, c, b, d, c, c, d, d. Row two, questions 13 to 24: d, b, b, d, b, d, a, d, d, a, a, b. Row three, questions 25 to 36: d, d, c, a, b, d, d, b, c, b, a, b. Row four, questions 37 to 48: b, a, a, b, c, d, d, b, c, a, c, d. And the final row, questions 49 to 52: a, d, a, d. That's the complete key. When you work through the Engine Instruments questions, these are the letters to check your answers against.