Private Pilot Private Exam

What action is required if there is an indication of a fuel contamination issue?

1. Flush the fuel system immediately

2. Check the fuel gauge readings

3. Drain and replace contaminated fuel

4. Adjust the fuel mixture for optimal performance

The correct answer is: Drain and replace contaminated fuel

When there is an indication of a fuel contamination issue, the correct action is to drain and replace contaminated fuel. This is essential because fuel contamination can severely affect the performance and safety of the aircraft. Contaminated fuel can lead to engine malfunction, reduced power output, or even engine failure, which poses significant risks during flight. Draining and replacing the contaminated fuel ensures that only clean, uncontaminated fuel is used in the engine, minimizing the risk of operational issues and maintaining the aircraft's performance and reliability. This action fits within standard operating procedures and regulations for maintaining aircraft safety. While checking the fuel gauge readings is important for monitoring fuel levels and ensuring you have enough fuel for your flight, it does not address the issue of contamination. Flushing the fuel system is an extreme measure that might not directly resolve the contamination issue and could instead introduce more contaminants into the system. Adjusting the fuel mixture would not eliminate the underlying problem of contaminated fuel and might lead to further complications in engine performance. Hence, draining and replacing the contaminated fuel is the most effective and responsible course of action.