FAA Powerplant Written Practice Test

What challenge is associated with a divided entrance inlet air duct on a turbine powered aircraft?

1. Increased engine noise

2. Difficulty due to drag produced

3. Poor aerodynamic stability

4. Reduction in maximum speed

The correct answer is: Difficulty due to drag produced

A divided entrance inlet air duct on a turbine-powered aircraft presents challenges primarily linked to drag production. When the airflow is split as it enters the engine, it can disrupt the smooth and efficient flow of air into the turbine, creating turbulence and increasing drag on the aircraft. This is particularly critical during high-speed operations, where minimizing drag is essential for maintaining speed and fuel efficiency. The increased drag is a result of the complex airflow patterns caused by the divided design, which can lead to less efficient engine performance and potentially impact the overall aerodynamic efficiency of the aircraft. Therefore, understanding the implications of engine air intake design is crucial for aviation engineers and pilots alike, as it directly influences the operational characteristics of the aircraft.