Which range is designed to prevent structural damage by managing pressure?

The Differential Pressure Range is specifically designed to prevent structural damage by carefully managing the pressure differences between the inside of an aircraft and the outside environment. This is crucial during flight, where the altitude can cause significant variations in external atmospheric pressure.

When an aircraft ascends, the pressure outside decreases, and if this pressure is not properly managed relative to the pressure inside the cabin, it can lead to structural stress and potential failure of the airframe. Maintaining an appropriate differential pressure ensures that the aircraft's structures remain intact and able to withstand the stresses of flight. This range tightly controls the balance between internal and external pressures, preventing excessive load on the airframe.

In contrast, the Unpressurized Range deals with aircraft that do not maintain an internal pressure, which means this aspect of structural integrity is not applicable. The Isobaric Range involves conditions where the pressure remains constant; although it does manage pressure, it is not specifically focused on preventing structural damage in the same way. The Cabin Ventilation Range focuses more on the airflow and comfort conditions within the cabin rather than the structural aspects related to pressure management.