Look at the entries starting with F and G — Page 657, Lesson 771

This is the index of the book, so I want to walk you through what this page is telling us about the territory we're about to cover. It's a map of the whole syllabus, and I want you to see the structure before we dive into any single system. Look at the entries starting with F and G. We have FORTRAN at page 310 — that's a programming language, and it appears in the section on flight management computers, because those systems are often coded in it. Then FREE at 219, which relates to a mode on an autopilot or flight director. Freedom in Roll at 172 — that's a characteristic of a gyroscope, describing how it's mounted to allow rotation about the roll axis. Free Text at 324 is a data entry mode on a flight management system, where you type in information freely rather than selecting from a menu. Freezing Point at 122 — that's in the section on temperature measurement and air data, where the freezing point of water is a calibration reference. Frequency Sweep at 263 is a test technique where you vary the frequency of an input signal to measure a system's response. Fringe Pattern at 256 and 257 — that's an optical interference pattern used in gyroscope technology, specifically in ring laser gyros, where the fringe pattern is used to measure rotation. FROM/TO at 241 is a VOR indicator flag that tells you whether you're flying toward or away from the station. Fuel Control at 398 and Fuel Metering Valve (FMV) at 398 — that's the engine fuel control system, where the FMV is the valve that meters the exact amount of fuel delivered to the engine. Full ILS Mode at 291 and Full VOR Mode at 289 are autopilot or flight director modes that capture and track the full instrument landing system or VOR signals. Full Pitot/Static System at 17 — that's the complete air data system that measures pitot pressure and static pressure for the airspeed indicator, altimeter, and vertical speed indicator. Function and Mode Keys at 276 are the buttons on a control display unit that let you select different functions and modes on the flight management system. Future Air Navigation Systems (FANS) at 325 — that's the concept for modernizing air traffic management using satellite-based navigation and digital datalink. FWS at 433 and 435 — that's the Flight Warning System, which generates the alerts and cautions you see on the displays. Now moving to G. Gain Adaption at 374 and Gain Scheduling at 417 — these are autopilot and flight control concepts where the system adjusts its gain, or sensitivity, based on flight conditions like airspeed or altitude. Gallons at 2 — that's a fuel quantity unit used in the introductory section on measurements. Gimbal Flip at 146, Gimbal Friction at 142, Gimballing Errors at 156 and 157, Gimbal Lock at 146, Gimbal Rings at 234, and Gimbals at 137 and 142 — these are all about gyroscope mounting. A gimbal is a pivoted ring that allows the gyro to rotate freely about its axes. Gimbal friction causes drift, gimbal lock is when two gimbal axes align and you lose a degree of freedom, and gimbal flip is the sudden reversal that can occur. These are the classic errors we study in gyroscopic instruments. Glide Slope Capture at 381 is the autopilot mode that captures the glide slope beam on approach. Glide Slope Deviation at 291 is the indication of how far you are from the glide slope centerline. And Global Air Traffic Management System at 319 is the worldwide framework for managing air traffic, which ties into FANS. So this index page is showing you the full scope — from basic measurement units like gallons, through gyroscope mechanics, air data systems, navigation aids, autopilot modes, and flight management computers. Each of these page numbers is a door into a specific system we'll study in detail.