What must be done if an aircraft is modified or repaired significantly?

When an aircraft undergoes significant modifications or repairs, it is crucial to ensure that the assembly and rigging are re-evaluated and certified for airworthiness standards. This is because any changes made to the aircraft can impact its structural integrity, aerodynamics, control system, and overall performance. Re-evaluating the assembly and rigging ensures that all components are correctly installed, aligned, and functioning as intended, adhering to safety regulations and standards set by aviation authorities.

Furthermore, certification for airworthiness standards is essential to guarantee that the aircraft meets the requirements necessary for safe operation in flight. This process involves inspections, tests, and possibly a review of design changes to determine that they do not adversely affect the aircraft’s performance.

While adjusting engine throttle settings, checking the fuel system integrity, or performing an engine overhaul may be necessary maintenance tasks, they do not directly address the comprehensive safety and performance evaluations required after significant modifications or repairs. The critical focus must remain on the complete system integrity of the aircraft.