What is the definition of closed skin in aviation repair?

The definition of closed skin in aviation repair refers to structures where access is constrained to one side, making them inaccessible from the outside. This type of construction is typical in aircraft design, where certain components are shielded by outer skins or structural elements that limit direct viewing or access.

In contrast to other options, which describe varying degrees of accessibility, the term "closed skin" specifically implies that the area cannot be directly accessed for inspection, repair, or modification without removing other components or layers. Understanding closed skin is crucial for maintenance personnel, as it impacts how repairs are performed and the methods needed to safely reach and address issues within those structures.