When should a Profile C for flight controls be conducted?

Conducting a Profile C for flight controls is essential whenever a flight control surface is re-rigged. This procedure ensures that the control surfaces are functioning correctly and within specified parameters after they have been adjusted or modified. The re-rigging process can affect how those control surfaces respond during flight, making it crucial to verify their alignment and performance through this specific check. This helps prevent potential issues during flight operations, ensuring the aircraft’s safety and operational reliability.