Look at the structure — Page 125, Lesson 143

This is the index of the book — the table of contents. So what I want to do is walk you through what this index is telling you, because it's actually a map of the entire subject you're about to learn: mass and balance, and performance, for the ATPL. Look at the structure. The index is alphabetical, and it's pointing you to page numbers. So if you want to find "Ramp Mass," you go to page 31. If you want "Specific Gravity," page 36. That's the practical use of it — a quick reference. But more importantly, this index reveals the core topics of the syllabus. Let me group them for you. First, the mass and balance side. You've got the fundamental mass definitions: Ramp Mass, Traffic Load, Useful Load — all on page 31. These are the building blocks of weight and balance. Then you have the centre of gravity work: Repositioning of the Centre of Gravity on page 49, and its two sub-cases — Repositioning by Repositioning Mass on page 50, and Repositioning by Adding or Subtracting Mass on page 53. That's the classic CG problem: you move weight, or you add/remove weight, and you calculate the new CG position. Then there's the weighing side of things. Weighing of Aircraft on page 34, the Weighing Schedule on page 34, the TECHNICAL LOG on page 34 — that's the formal record. Then Weighing Equipment on page 35, Weigh-bridge Scales on page 35, and Weighing Procedures on page 6. Notice the distinction: the equipment is the physical hardware — the weigh-bridge scales — and the procedures are how you actually use them. Now, the fuel and loading side. You have Start and Taxi Fuel and Trip Fuel on page 65 — those are the fuel phases. Running Load on page 62 — that's the load per unit length, important for distributed cargo. Stabilizer Trim Setting on page 62 — that's the horizontal stabilizer setting you need for a given CG. And UD Loads on page 58 — that's Unit Load Devices, the containers and pallets used to load cargo. Then there's the performance side. This is where the index gets interesting. You have Take-off and Landing Distances on page 26, Stalling Speed on page 26, Rate of Descent on page 26, Safety Margins on page 26, Wing Root Stresses on page 26, Undercarriage Loads on page 26, and the speeds — V1 Decision Speed, VR Rotation Speed, V2 Take-off Safety Speed — all on page 26. And Range and Endurance on pages 26 and 28. So page 26 is a dense performance page. And you have Spin on page 28 — that's the aerodynamics of a spin, which is a performance and safety consideration. Now, the aircraft-specific sections. You have SEP1 CG Envelope on page 45 — that's the centre of gravity envelope for the Single-Engine Piston aircraft. And Single-Engine Piston / Propeller Aircraft (SEP1) on page 60. Then there's a section for MEP1 — multi-engine piston — and MRJT1 — medium-range jet transport — with Questions for SEP1, MEP1 and MRJT1 on page 78. So the syllabus uses three representative aircraft types: a single-engine piston, a multi-engine piston, and a jet transport. And there are two more entries I want to highlight. TR on page 71, and Transit on page 71. TR is the Turnaround — the time on the ground between arrival and departure. Transit is the stopover. Both are operational concepts tied to the turnaround cycle. Also, note the units. You have Pounds on page 36, and Quantity Mass Conversion Chart on page 37. That's the fuel conversion — converting between volume and mass. And Specific Gravity (SG) on page 36 — that's the ratio of the density of a substance to the density of water, and it's how you convert fuel volume to mass. That's a critical skill: fuel is often measured in volume, but mass and balance works in mass, so you need the specific gravity to convert. So the whole index is telling you: this course is about (1) the mass definitions, (2) the centre of gravity and its repositioning, (3) the weighing procedures and equipment, (4) the fuel and loading concepts, (5) the performance parameters like speeds and distances, and (6) the three aircraft types you'll apply it to. That's the map. Now you know where everything lives. When we start the actual chapters, you'll be building on these definitions — Ramp Mass, Traffic Load, Useful Load, Specific Gravity, the CG repositioning methods, the V-speeds. So keep this structure in mind as the skeleton of the whole subject.