Notification to the NTSB is required when there has been substantial damage which?

Notification to the NTSB is necessary when substantial damage to an aircraft adversely affects its performance. This includes any situation where the integrity or functionality of the aircraft is compromised to the extent that it could impact the aircraft's safety in flight. Substantial damage is defined as damage that affects the structural strength, performance, or flight characteristics of the aircraft, requiring major repairs or replacement of components.

In contrast, damage resulting from pilot error or occurring during routine checks does not necessarily mean that the aircraft has sustained performance-affecting substantial damage. Similarly, minor structural failures typically do not require NTSB notification unless they significantly impact the aircraft's performance or safety. Therefore, when substantial damage adversely affects performance, it is crucial for safety and regulatory compliance to notify the NTSB.