Plain Bearings. . . . . . . . . . . . . . . . . . . . . . . 25 — Page 456, Lesson 580

This is the index of the book — the alphabetical list of topics and the pages where they appear. So what I want to walk you through is how to read this thing, because it's a working tool for your studies, not just a list. Look at the entries here. You've got "Plain Bearings" on page 25, "Planetary Gears" on page 31, "Pneumatic Systems" on page 30. These are all mechanical and systems topics. Then you've got "Popping Back" on pages 29 and 93 — that's an engine condition, and the fact it appears twice tells you it's discussed in two different contexts, so when you revise, you need to check both places. Now notice the pattern with the "P" entries. "Potential Difference" on page 9 — that's electrical, it's the voltage across a component. "Potential Energy" on pages 5 and 9 — that's the stored energy in a system, and again, two page references means it's covered in two places. "Power" on page 4 — that's the rate of doing work. "Power Stroke" on page 18 — that's the stroke in a four-stroke cycle where combustion drives the piston down. You'll also see "Pressure" on page 9, and then a whole family of pressure-related terms: "Pressure Balance Duct" on page 105, "Pressure Filter" on page 46, "Pressure Losses" on page 254, "Pressure Lubrication" on page 43, "Pressure Pump" on page 46, "Pressure Relief Valve" on page 46, "Pressure Scavenging" on page 18. See how the index groups related terms alphabetically — that's deliberate. When you're revising lubrication, you'd look up "Pressure Lubrication" and find pages 43 and 46, which cover the filter, the pump, and the relief valve together. There's also "Pressure (Choked Nozzle) Thrust" on page 312 — that's a gas turbine term, the thrust produced when the nozzle is choked, meaning the flow is at sonic velocity. And "Pressurizing and Dump Valve" on page 378 — that's a fuel system component. Now the combustion-related entries: "Pre-ignition" on page 84 — that's when the mixture ignites before the spark, and it's dangerous. "Priming" on page 110 — that's injecting fuel manually before start. "Primary Air" on page 248 — that's the air that enters the combustion zone first. "Primary Coil" on page 67 — that's the low-voltage winding in the ignition coil. And you've got the gas turbine entries: "Principles of the Gas Turbine Engine" on page 200 — that's the core theory chapter. "Propeller" on pages 25 and 163 — again, two contexts, one in the index itself and one in the main text. "Propeller Control Unit - PCU" on page 175 — that's the unit that governs propeller pitch. And "Propeller Efficien" — that's cut off, but it's "Propeller Efficiency," the ratio of thrust power to shaft power. So the key skill here: when you see a page number, that's your map. When you see two page numbers, that topic is covered in more than one place, and you need both for a complete picture. This index is how you navigate the whole book — use it to cross-reference, not just to find a single page.