Definition
An electrical device used in turbine engines to produce a high-energy spark that ignites the fuel-air mixture in the combustion chamber during engine start. Igniters are typically used only briefly at start-up; once combustion is self-sustaining, the igniters are switched off and the flame continues without them.
Plain English
The part that creates a strong spark to light the fuel inside a jet engine when it is starting up. After the engine is running, the spark is no longer needed and the igniter shuts off.
Context Anchor
Seen in aircraft engine starting systems, turbine engine maintenance, ignition checks, and troubleshooting a no-start or hard-start condition.
Derivation
From the Latin ignire, meaning to set on fire. The word carries straight across to aviation: a device whose job is to start the fire inside the engine.
Why Pilots Care
A working igniter ensures reliable engine starts, especially in cold weather or after flameouts, directly affecting safety and dispatch reliability.
Intuition Check
An igniter is not the whole ignition system. It is the spark-making part that lights the fuel-air mixture.
Example Sentence 1
During engine start, the crew confirmed both igniters were firing before introducing fuel.
Example Sentence 2
During the hot-section inspection the igniter was removed and tested for proper gap and insulation resistance.