Which incident requires immediate notification to NTSB?

The requirement for immediate notification to the National Transportation Safety Board (NTSB) is primarily associated with events that indicate safety-related incidents or potential hazards that could compromise the integrity of flight operations.

A flight control system malfunction is classified as a significant safety issue because it directly impacts the aircraft's ability to fly and be controlled safely. Such malfunctions can lead to serious accidents if not addressed immediately, and they require thorough investigation to understand the causes and to prevent future occurrences. The NTSB's role is to ensure that any accident or incident with serious implications is thoroughly investigated, and reporting a flight control malfunction is critical for maintaining aviation safety standards.

While other incidents such as damage to property exceeding a certain threshold or an engine failure may also require reporting under specific circumstances, they do not necessitate immediate notification unless they result in a major accident or loss of life. Mild turbulence events, on the other hand, typically do not warrant any notification because they are common occurrences in flight operations and rarely result in serious outcomes.

Thus, the notification of the NTSB in the case of a flight control system malfunction is essential for proactive safety management and risk mitigation in aviation.