Definitions — Page 10, Lesson 11

We're starting a new section now — the definitions list for Air Law. This is the glossary that underpins everything else in the book, so I want to walk you through it properly. Let me begin with the airspace and navigation terms. CTR stands for Control Zone — that's the controlled airspace surrounding an aerodrome, extending from the surface up to a specified upper limit. DA is Decision Altitude — the altitude at which a pilot must decide whether to continue an approach or execute a missed approach. DH is Decision Height — the same concept, but measured as a height above the runway threshold rather than an altitude above mean sea level. The distinction matters: altitude is referenced to sea level, height is referenced to the ground. Now, the radio and navigation aids. DF is Direction Finding — a ground-based system that determines the bearing of an aircraft from its radio transmissions. DME is Distance Measuring Equipment — it gives you slant range distance from the aircraft to a ground beacon. DR is Dead Reckoning — navigating by calculating your position from your heading, speed, time, and known starting point, without external references. GCA is Ground Controlled Approach — a radar-based approach where a ground controller gives you instructions to guide you down. GPS is Global Positioning System — the satellite-based navigation system. HF is High Frequency — the radio band used for long-range communications. Hz is Hertz — the unit of radio frequency, cycles per second. IAS is Indicated Air Speed — the speed shown on your airspeed indicator, before corrections for position and instrument error. Let me cover the time and flight planning terms. EAT is Expected Approach Time — the time you can expect to be cleared to commence an approach. EET is Estimated Elapsed Time — the estimated time to fly from one point to another. ETA is Estimated Time of Arrival — the estimated time you'll reach your destination. GMT is Greenwich Mean Time — the time standard used in aviation. FL is Flight Level — a pressure altitude expressed in hundreds of feet, referenced to the standard pressure setting of 1013.25 hectopascals. FAT is Final Approach Track — the path you fly on the final approach segment. Now the emergency and safety equipment. ELT is Emergency Location Transmitter — a device that transmits a distress signal to help locate a crashed aircraft. EPIRB is Emergency Position Indicating Radio Beacon — similar, but typically used for maritime or survival purposes. ED is Emergency Distance — the distance required to stop or abort in an emergency situation. Let me move to the regulatory bodies and approvals. EASA is the European Aviation Safety Agency — the agency that regulates civil aviation safety in Europe. EC is the European Commission — the executive body of the European Union. ECAC is the European Civil Aviation Conference — an intergovernmental organization promoting cooperation in civil aviation across Europe. EU is the European Union. DG TREN is the Directorate-General for Transport and Energy — a department of the European Commission. FAA is the Federal Aviation Administration — the US aviation regulator. ICAO is the International Civil Aviation Organization — the UN specialized agency that sets global aviation standards. Now the certification and approval terms. DOA is Design Organization Approval — approval granted to an organization that designs aircraft or components. DOE is Design Organization Exposition — the document that describes how that organization complies with the approval requirements. EPA is European Part Approval — approval for a part or appliance. ETSO is European Technical Standard Order — a standard for certain aviation articles. ETSOa is European Technical Standard Order authorization — the authorization to manufacture and sell articles to that standard. EPR is Environmental Protection Requirements — the standards for noise and emissions. ER is Essential Requirements — the fundamental safety requirements that must be met. Let me cover the operational and licensing terms. FCL is Flight Crew Licensing — the regulations governing pilot licenses. FI is Flying Instructor — the person who teaches flying. FFS is Full Flight Simulator — the highest level of flight simulator, with full motion and visual systems. FTD is Flight Training Device — a lower-level training device without full motion. FTL is Flight Time Limitations — the rules limiting how many hours a crew can fly. GA is General Aviation — all civil aviation operations other than scheduled air services and cargo. GASIL is General Aviation Safety Information Leaflet — safety guidance published for GA pilots. GM is Guidance Material — explanatory material that supports regulations. H24 is Day and Night Operating Hours — continuous 24-hour operation. FAL is Facilitation of Air Transport — the simplification of border and customs procedures for air transport. Two more terms. FLPFM is Foot Launched Powered Flying Machine — a powered aircraft that you launch by foot, like a powered paraglider. And ETOPS is Extended Twin Jet Operations — the rules that allow twin-engine aircraft to fly routes where an engine failure would put them more than a certain time from a suitable diversion airport. One more thing — db is Decibel, the acoustic measurement unit, and E is Engine. And Ibn is Identification Beacon — a device that transmits a signal to identify the aircraft. That's the full set of definitions for this section. These terms will recur throughout the rest of the book, so it's worth being comfortable with them before we move on.