What does a modification in a technical order typically refer to?

A modification in a technical order generally pertains to the alteration of existing aircraft systems. This can include updates to components, systems, or procedures that directly affect the functionality or performance of the aircraft. Such modifications are essential to ensure that the aircraft remains safe, efficient, and compliant with the latest technological advancements or regulatory requirements.

In contrast, updates to flight manuals, changes in aircraft models, or maintenance schedules do not directly involve altering existing systems within the aircraft. Instead, they focus on documentation, classifications, or procedural timelines, which do not reflect the core meaning of a technical modification.