What Happens When a Jet Engine Starts

A jet engine cannot begin by simply spraying fuel into a motionless machine and lighting it. Before combustion can support itself, air must already be moving through the compressor. A starter turns the engine. The compressor begins building airflow. Ignition and fuel are introduced in a controlled sequence. The turbine then extracts enough energy from the hot gas to keep the compressor turning without starter help. General aviation education only, not flight instruction, maintenance guidance, or a substitute for approved manuals and trained professionals. Sources and further reading: - FAA Aviation Maintenance Technician Handbook, Powerplant, Chapter 5: https://www.faa.gov/sites/faa.gov/files/07_amtp_ch5.pdf - NASA Glenn Research Center, Gas Turbine Propulsion: https://www1.grc.nasa.gov/beginners-guide-to-aeronautics/turbine-engines/