Which term describes the range where the pressure difference between cabin and outside is actively managed to avoid exceeding structural limits?

• A. Differential pressure range
• B. Isobaric range
• C. Unpressurized range
• D. Heat exchanger range

Answer: (A)

The main idea here is how the pressurization system keeps the cabin pressure relative to the outside within safe limits. The difference between cabin pressure and outside air pressure is called the differential pressure, and the system deliberately maintains that difference within a designed range so the fuselage isn’t stressed beyond what it can safely handle. That bounded interval is the differential pressure range.

Other terms don’t fit because:

• Isobaric range would imply a constant cabin pressure, which isn’t what’s actively managed across different altitudes.

• Unpressurized range refers to periods or configurations where the cabin isn’t pressurized at all.

• Heat exchanger range deals with temperature control, not pressure.