Look at the entries here — Page 456, Lesson 575

This is the index of the book — the table of contents for the letter I and J entries. So what I want to walk you through is how this index is organized, because it tells you exactly how the whole powerplant syllabus is structured. Look at the entries here. You've got Hydraulic Medium on page 43, Hydraulics on page 30, Hydraulic Tappets on page 29. These are all alphabetized under H. Then under I, you have a long run of terms. IEOH — that's an acronym for internal engine overheat — on page 397. Igniter Plugs on 345, Ignition Switch on 68, Impact Ice on 118, Impulse Coupling on 69. Now, notice the pattern. Each entry is a technical term followed by a page number. That page number is where in the book that topic is covered in detail. So when you're studying, this index is your map — you look up a term, and it tells you exactly where to find the full explanation. Let me point out a few specific ones so you see how the terminology works. Indicated Horsepower, abbreviated IHP, is on page 21. Indicated Mean Effective Pressure, abbreviated IMEP, is on page 20. These are two different measures of engine power — IHP is the power developed inside the cylinders, and IMEP is the average pressure that produces that power. You'll see both defined precisely when we get to those pages. Then you have Indicator Diagram on page 19 — that's the graphical record of pressure inside the cylinder through the cycle. Induction Stroke on page 17 — that's the stroke where the piston draws the fuel-air mixture into the cylinder. Ineffective Crank Angle on page 18 — that's the portion of crankshaft rotation where no useful work is being done. There's a figure for that one, by the way — shows the ineffective crank angle visually. And shows the manifold absolute pressure gauge, which relates to the Induction Manifold on page 30 — that's the pipe that distributes the fuel-air mixture to the cylinders. Now, the J section. JET A on page 367, JET A1, which is also called AVTUR, on page 367, and JET B, also called AVTAG — that stands for aviation turbine gasoline — also on page 367. These are the three main jet fuel types. JET A and JET A1 are kerosene-based fuels; JET B is a wider-cut fuel, a blend of kerosene and gasoline fractions. The AVTUR and AVTAG are the military designations for the same fuels. So the key takeaway here: this index is your navigation tool. Every term you'll be tested on is listed here with its page. When you see an acronym like IEOH or IHP, the index expands it for you. When you see a fuel designation like JET A1, the index gives you the alternative name AVTUR. That's how you cross-reference the material. Now, one thing to note — the page numbers here are the book's internal page numbers, not the PDF page numbers. So when you're looking at the actual document, you may need to account for that offset. But the structure is what matters: alphabetized, with every technical term, every acronym, every fuel type, mapped to its location. That's the index. It's the skeleton of the whole powerplant syllabus — every topic you'll cover, from hydraulic tappets to jet fuels, is right here waiting for you.