What is the primary reason for not sealing everything on an airplane?

The primary reason for not sealing everything on an airplane is weight. In aviation, every component of an aircraft must be designed with weight considerations in mind, as excess weight can negatively impact fuel efficiency, payload capacity, and overall performance. Sealing various areas of the aircraft can add unnecessary weight that could compromise these essential factors.

For instance, while certain areas, such as fuel tanks or pressurized compartments, may require sealing to ensure safety and efficiency, other components may not benefit from being sealed and could lead to additional weight without a corresponding benefit.

Balancing the need for sealing with the necessity of maintaining an optimal weight is crucial in aircraft design and maintenance, emphasizing how integral weight management is in aviation engineering and operations.