When should adjustments to rigging be thoroughly re-checked?

Thorough re-checks of rigging should be performed after any maintenance or modification to the flight control system to ensure the integrity and proper functionality of the controls. This is critical because any alterations, even minor ones, can significantly affect the performance and safety of the aircraft. Adjustments to rigging can impact the responsiveness of flight controls, and ensuring that everything is within specifications post-maintenance is essential to prevent potential malfunctions or hazardous situations during flight.

While pre-flight checks and routine monthly inspections also play vital roles in ensuring safety, they do not specifically address the immediate and potentially drastic effects of changes made to the flight control system. Regular checks and maintenance routines are beneficial but should never replace the immediate diligence required after any modifications to the control systems, as these are when the risk of error is highest.