What procedure is typically followed before commencing structural repairs on aircraft?

The correct procedure before beginning structural repairs on aircraft is the assessment and planning stage, which includes conducting a thorough inspection. This step is crucial as it allows mechanics to understand the full extent of the damage and the necessary repairs required. During this phase, technicians assess the structural integrity of the aircraft, identify any damaged components, and plan the repair strategies. This preparatory work is vital to ensure repairs are effective and adhere to safety standards. Proper assessment helps in anticipating potential complications and ensures all required materials and tools are gathered before the repair process begins.

Taking immediate action without assessment could lead to incomplete or improper repairs that might compromise the aircraft's safety and operational capabilities. Likewise, performing an emergency drill or engaging in a final inspection would occur at different points of the maintenance cycle and are not relevant to preparing for structural repair activities. Thus, the assessment and planning stage is a necessary and systematic approach that ensures a successful repair process while maintaining the safety and integrity of the aircraft.