Definition
The process by which an engine draws outside air into itself so that air can be mixed with fuel and burned to produce power. In a gas turbine engine, induction refers specifically to the intake stage where ambient air enters through the inlet and is delivered to the compressor.
Plain English
Induction is how the engine breathes in. It is the part of the engine cycle where air is pulled in from outside before anything else happens to it.
Context Anchor
Seen when describing the basic operating cycle of a gas turbine engine: induction, compression, combustion, turbine, and exhaust.
Derivation
From Latin inducere, meaning 'to lead in.' The engine 'leads' air in from the outside before doing anything with it. That simple sense — leading air inward — is exactly what the word still means in aviation.
Why Pilots Care
The induction system is where many real-world engine problems start. Blocked inlets, induction icing, and contaminated air filters all reduce the air the engine can draw in, which directly reduces power available. Recognizing induction as the first stage of airflow helps pilots understand why carb heat, alternate air, and inlet inspections matter.
Analogy
Induction is like taking a breath before doing work. The engine must first take in air before it can compress it, burn fuel with it, and produce power.
Intuition Check
Induction here does not mean a ceremony or electrical effect. It means the engine taking air in at the start of its operating cycle.
Example Sentence 1
Ice forming in the induction system can restrict airflow and cause a noticeable drop in engine power.
Example Sentence 2
Restricted induction airflow reduced compressor efficiency during climb.