Gas Turbine Systems Technician – Mechanical (GSM) A School Test 4 Practice

Spark ignition starts by placing igniters in the combustion liners that are designated for light-off. These liners are chosen so a single spark can reliably ignite the air-fuel mixture and then spread flame to neighboring burners, giving a stable start across the whole combustor. The two ignition liners in this engine configuration are positioned to cover the essential ignition zone and provide redundancy during light-off. That pairing is the one identified as the ignition set in the diagram. Other liners aren’t equipped with igniters because they’re not used for light-off and are instead dedicated to other functions like fuel distribution or cooling, which would not support reliable ignition if used for sparks.