Which method is commonly used to secure fabric seams in aircraft covering?

The commonly used method to secure fabric seams in aircraft covering is double stitching. This technique is preferred because it provides additional strength to the seams, which is critical in maintaining the integrity of the aircraft's fabric covering. Double stitching creates two lines of stitching, which not only enhances the hold but also helps to distribute stress more evenly across the seam. This is particularly important in the aviation context, as the seams must withstand various forces during operation, including airflow and pressure changes.

Using only adhesive, while it can provide some level of bonding for fabric, does not offer the tensile strength and durability that stitching provides. Adhesives also may not perform well in the varied environmental conditions that aircraft experience.

Single stitching lacks the redundancy and strength of double stitching, making it less ideal for high-stress areas of the aircraft where seams may experience significant strain.

Sewing with a regular needle does not account for the specific requirements of aircraft fabric covering, such as the need for heavy-duty threads and specialized needles that can handle the thicker layers and materials used in aviation fabrics.

Thus, double stitching is the most effective method for securing fabric seams in aircraft covering due to its robustness and reliability.