Which two conditions must turbine engine fuel control prevent?

The two conditions that turbine engine fuel control must prevent are lean die out and rich blow out.

Lean die out occurs when the fuel-to-air mixture is too lean, which may lead to engine flameout. This is particularly critical in turbine engines since they rely on a specific air-fuel ratio for optimal combustion and performance. If the mixture becomes too lean, there is insufficient fuel to sustain combustion, causing the engine to lose power or shut down completely.

Rich blow out, on the other hand, happens when the fuel-to-air mixture is excessively rich, causing unburned fuel to escape the combustion chamber. This condition can lead to engine inefficiency, increased emissions, and potentially damage to engine components due to excessive fuel in the combustion section.

Turbine engine fuel control systems are designed to carefully manage these ratios to ensure that the engine runs smoothly and efficiently across various operating conditions. By preventing these two equally detrimental conditions, the fuel control system enhances the reliability and safety of turbine engines.