Which of the following is NOT a sign of engine failure in a helicopter?

Which of the following is NOT a sign of engine failure in a helicopter?

• A. RPM horn activation
• B. Oil pressure light illumination
• C. Nose left yaw
• D. Increase in rotor RPM

Answer: (D)

The correct answer is that an increase in rotor RPM is not a sign of engine failure in a helicopter. When an engine fails, the engine's power output decreases, which in turn can lead to a decrease in rotor RPM, not an increase. In most helicopter configurations, the rotor system relies on engine power to maintain proper RPM. When there is a failure, typically, the opposite effect occurs, which aligns with the other choices provided in the question. For example, RPM horn activation and oil pressure light illumination indicate critical abnormalities, and a nose left yaw often results from a loss of power on one side, which describes engine performance issues. Therefore, an increase in rotor RPM during an engine failure scenario would be inconsistent and is not a recognized sign of such an event. This understanding is critical for recognizing engine failure symptoms and managing emergency situations effectively.

The correct answer is that an increase in rotor RPM is not a sign of engine failure in a helicopter. When an engine fails, the engine's power output decreases, which in turn can lead to a decrease in rotor RPM, not an increase.

In most helicopter configurations, the rotor system relies on engine power to maintain proper RPM. When there is a failure, typically, the opposite effect occurs, which aligns with the other choices provided in the question. For example, RPM horn activation and oil pressure light illumination indicate critical abnormalities, and a nose left yaw often results from a loss of power on one side, which describes engine performance issues. Therefore, an increase in rotor RPM during an engine failure scenario would be inconsistent and is not a recognized sign of such an event. This understanding is critical for recognizing engine failure symptoms and managing emergency situations effectively.