How should the edges of drainage and inspection holes be reinforced?

Reinforcing the edges of drainage and inspection holes with plastic, aluminum, or brass grommets is essential for several reasons. Grommets provide a durable and effective means of protecting the structural integrity of the material surrounding these holes. They help prevent fraying or tearing that can occur over time due to wear and environmental factors. By using grommets, the pressure and stress on the edges of the holes are evenly distributed, reducing the risk of damage.

Additionally, grommets can serve to enhance the overall functionality of the hole by providing a smooth surface through which drainage can occur, preventing blockages or snagging from any edges. This is particularly critical in aviation, where the functionality and reliability of all components are paramount.

While other methods, such as fabric strips, rubber seals, or stitching, might provide some level of reinforcement, they do not offer the same level of durability and protection against the wear and tear that grommets do. Therefore, using plastic, aluminum, or brass grommets is the most effective solution for reinforcing drainage and inspection holes.