How do deicing fluids affect engine performance when they enter the engine?

Deicing fluids, when they enter the engine, can lead to a reduction in engine performance primarily due to their physical and chemical properties. These fluids are typically designed to lower the freezing point of water, which can lead to undesirable effects when ingested by the engine. Specifically, the presence of deicing fluids in the engine can create conditions conducive to surges and stalls.

Surges occur when there is an abrupt change in airflow through the engine, which can be aggravated by the viscosity and composition of the deicing fluid. When deicing fluid mixes with the airflow and fuel, it can disrupt the smooth operation of vital engine components, such as the compressor. This disruption can lead to a temporary loss of thrust or fluctuating power output, causing stalls.

In short, the presence of deicing fluids negatively impacts engine performance by promoting unstable airflow characteristics and potential power loss, which is a critical consideration during winter operations.