What is the function of the rib lacing cord in fabric covering?

The function of the rib lacing cord in fabric covering is to secure the fabric to the rib structure, preventing movement and ensuring proper tension. This is crucial for maintaining the integrity of the fabric covering on an aircraft, as it allows for a tight and secure fit that can withstand aerodynamic forces during flight. By preventing movement, the rib lacing cord helps to avoid potential damage to the fabric itself, which could lead to issues such as wear or tearing. Proper tension contributes to the overall performance and safety of the aircraft, ensuring that the covering performs as intended under various conditions.