What constitutes "substantial damage" in aviation law?

"Substantial damage" in aviation law is defined as damage that significantly affects the structure or function of the aircraft. This definition is crucial for the aviation industry because it helps determine when an aircraft is no longer airworthy and requires inspection, maintenance, or repair.

In regulatory contexts, "substantial damage" typically implies that the damage is not merely cosmetic or minor and goes beyond damage that can be quickly or easily repaired. This type of damage can compromise safety and operational integrity, necessitating more extensive evaluation and action to ensure the aircraft can be safely returned to service. Examples of substantial damage might include significant deformation of the airframe, failure of critical systems, or damage that impairs controllability during flight.

While damage requiring repair is essential to consider, it doesn’t necessarily denote substantial damage unless it also severely affects the aircraft's operational capabilities. Similarly, damage impacting flight controls and damage requiring a complete replacement of parts could be significant, but they don’t encapsulate the broader concept of structural or functional impairment, which is at the core of what defines "substantial damage" in aviation law.