Look at the entries under "S" first — Page 458, Lesson 584

This is the index of the book — the alphabetical list of topics with their page numbers. I want to walk you through what this tells us about the structure of your Powerplant syllabus, because the way these entries are grouped is itself a lesson in how the subject fits together. Look at the entries under "S" first. We have Suction Filter, Sulphur Content, Sump — these are all fuel-system and lubrication components. Then Supercharger Controls, Supercharger Drives, Supercharging — that's the forced-induction family, the mechanical supercharger that compresses air before it enters the cylinders. Then Supervisory EEC — that's the Electronic Engine Control, the supervisory type that monitors and trims the engine's operation. Then Surge — that's the compressor stall condition where airflow breaks down and reverses. And Swept Volume — that's the volume displaced by the piston as it travels from bottom dead centre to top dead centre. Now the "T" entries. Temperature Increase Allowed and Temperature Increase Required — these are the two sides of the turbine temperature margin: what the material can tolerate versus what the cycle demands. Temperature Limit of the Engine, Temperature Measurement, Thermocouple — the thermocouple is the sensor that measures exhaust gas temperature, and it appears at pages 60, 95, and 272, which tells you it's used in three different contexts: cooling, ignition, and turbine temperature measurement. Tertiary Air — that's the third airflow path in the combustion chamber, the dilution air that cools the gases before they reach the turbine. Tetra Ethyl-lead — that's the lead additive in aviation gasoline that boosts its octane rating. The Diffuser — that's the component that slows the air down and raises its pressure after the compressor. The High Pressure (HP) Fuel Pump — that's the pump that delivers fuel at the high pressure needed for injection. Theoretical Otto Cycle — that's the idealised four-stroke spark-ignition cycle, pages 14 and 16. The Propeller Pitch Control Lever, also called the rpm Lever, and The Throttle Lever, also called the Power Lever — these are the two primary engine controls in a constant-speed propeller system. Thermal Efficiency — that's the ratio of useful work output to the heat energy input. Thermal Shock — that's the rapid temperature change that can crack engine components. Thermodynamics — that's the science of heat and energy conversion, page 5. Thermostat — that's the temperature-sensitive valve in the cooling system. Third Law — that's Newton's Third Law, the action-reaction principle that produces thrust. And Thrust itself, page 309. Notice the cross-referencing pattern. The same component appears under multiple headings — Thermocouple at three pages, Thermal Efficiency at two, Theoretical Otto Cycle at two. That's the book telling you these concepts recur across different chapters because they're foundational. When you study the index, you're seeing the skeleton of the whole Powerplant syllabus: the fuel system, the lubrication system, the supercharging system, the combustion process, the engine controls, and the thermodynamics that tie them all together.