Aviation Glossary
10A comprehensive glossary of aviation terms, acronyms, and technical jargon explained in plain language.
Bleed Air
High-pressure, high-temperature air tapped from the engine compressor stages, used for cabin pressurization, air conditioning, wing de-icing, and other aircraft systems.
Engines & PropulsionBypass Ratio
BPRThe ratio of air mass flowing around the engine core to air flowing through the core, a key indicator of fuel efficiency.
Engines & PropulsionFan Blade
The large rotating aerofoil blades at the front of a turbofan engine that accelerate air to generate bypass thrust and feed the engine core.
Engines & PropulsionFull Authority Digital Engine Control
FADECA computerized system with complete authority over all engine parameters, optimizing performance and protecting engines from damage without mechanical backups.
Engines & PropulsionNacelle
The aerodynamic housing that surrounds and protects an aircraft engine, reducing drag and noise while directing airflow.
Engines & PropulsionSpecific Fuel Consumption
SFCA measure of engine fuel efficiency: the mass of fuel consumed per unit of thrust produced per hour, expressed in lb/(lbf·h) or kg/(kN·h).
Engines & PropulsionThrust
The forward force produced by an aircraft's engines, measured in pounds-force (lbf) or kilonewtons (kN), enabling flight and climb.
Engines & PropulsionThrust Reverser
A mechanical device that temporarily redirects engine exhaust forward to provide braking force after touchdown on landing.
Engines & PropulsionTurbofan Engine
The most common jet engine type used in commercial aviation, using a large fan to generate most of its thrust.
Engines & PropulsionTurboprop Engine
A jet engine that drives a propeller via a reduction gearbox, offering high efficiency at low altitudes and short-range routes.
Engines & Propulsion