What is the primary cause of inflight flameouts in a turbine engine?

Inflight flameouts in a turbine engine predominantly occur due to fuel starvation or compressor stall. Fuel starvation happens when the engine does not receive the necessary amount of fuel to maintain combustion, which can result from various factors including fuel system issues, fuel contamination, or low fuel pressure. This lack of fuel interrupts the combustion process, leading to a flameout.

Compressor stall can also contribute to flameouts. A stall in the compressor section disrupts the airflow required for proper combustion. When airflow is obstructed, the engine may become incapable of sustaining the combustion process, resulting in a flameout. Both fuel starvation and compressor stall highlight the critical importance of maintaining stable fuel flow and adequate airflow in the engine operation.

While excessive fuel supply can lead to other problems, it typically does not lead directly to flameouts. Improper ignition timing is more relevant during engine start-up than during flight operations. High ambient temperatures can affect engine performance but are not a primary cause of inflight flameouts. Thus, fuel starvation or compressor stall is the most accurate cause for this phenomenon.