FAA Powerplant Written Practice Test

What do hot spots on the tail cone of a turbine engine exhaust indicate?

1. Normal engine performance

2. Problem in the combustion section

3. Fuel efficiency

4. Excessive noise levels

The correct answer is: Problem in the combustion section

Hot spots on the tail cone of a turbine engine exhaust are indicative of problems in the combustion section. These localized areas of high temperatures suggest that there may be inefficient combustion taking place, which could result from issues such as flame instability, fuel-air mixture imbalance, or even component malfunctions within the combustion chamber itself. In a properly functioning engine, the exhaust temperatures should be uniform throughout, reflecting stable combustion and efficient operation. When hot spots occur, they highlight areas where combustion is not occurring optimally, potentially leading to further complications such as excessive wear on engine components or increased emissions. Hence, recognizing these hot spots is crucial for maintenance and ensuring the engine operates safely and effectively.