First, under B, we have Biplane at page 20 — Page 346, Lesson 432

This is the index of the book — the alphabetical list of every topic inside. I want you to see it as a map of the whole course, because it tells you exactly what we're going to cover and in what order. Let me walk you through the entries that start with B and C, since those are the ones in front of us. First, under B, we have Biplane at page 20. That's an aircraft with two wings, one above the other. Right after it, Bolting at page 27 — that's the method of joining parts together using bolts, and it's a key structural connection technique. Then Booster pumps at page 317. These are pumps in the fuel system that increase fuel pressure to feed the engine. Next to it, Bootstrap at page 209 — that's a type of air cycle machine used in air conditioning systems. Braced Monoplane at page 20 — that's a single-wing aircraft where the wing is supported by external struts or wires. You'll see that in Figure 1.20. Then we get into the braking system. Brake Control Valves at page 66 — these are the valves that control hydraulic pressure to the brakes. Brake Modulating at page 132 — that's the process of varying brake pressure smoothly. Brake Release at page 130 — releasing the brakes. And Brake Temperature Indicators at page 142 — instruments that show how hot the brakes are. Bramah's Press at page 48 — that's the original hydraulic press, the principle behind all hydraulic systems. Breaker Strips at page 119 — those are strips in a tyre that help prevent damage. Then we have two fire extinguishing agents: Bromochlorodifluromethane (BCF) at page 302 and Bromotrifluromethane (BTM) at page 303. These are halogenated hydrocarbons used to put out fires. Finally, Bulkheads at page 16 — the structural walls that divide the fuselage into sections. Now under C, we start with Cable Tension at page 152 — that's the proper tightness of control cables. Cantilever Monoplane at page 21 — a single-wing aircraft where the wing is self-supporting, with no external bracing. Carbon Dioxide (CO2) at page 303 — another fire extinguishing agent. Castoring at pages 95 and 98 — that's a wheel that can swivel freely, like on a tailwheel. Chemical Oxygen Generators at page 267 — these produce oxygen through a chemical reaction. Circular at page 12 — that's a fuselage cross-section shape. Closed System at page 55 — a hydraulic system where fluid circulates in a sealed loop. Collector Tank (feeder Box) at page 317 — that's a small tank that collects fuel and feeds it to the engine. Combustion Heater at page 204 — a heater that burns fuel to warm the cabin air. Composite Materials at page 25 — materials made from two or more different substances combined. Compression at page 3 — a force that squeezes or pushes together. Constant Delivery at page 59 — a pump that delivers a fixed flow rate. Constant Pressure at page 59 — a system that maintains steady pressure. Continuous Fire Detectors at page 293 — sensors that constantly monitor for fire. Continuous Flow Oxygen System at page 262 — an oxygen system that delivers a steady flow. Control Balancing at page 168 — balancing control surfaces to reduce pilot effort. And finally, Control Locks — devices that lock the controls when the aircraft is parked. That's the index. It's a lot of ground, but we'll take it topic by topic.