Cabin Altitude

Cabin Altitude is the equivalent altitude inside the pressurized cabin, expressed as the altitude in the standard atmosphere that corresponds to the cabin's internal air pressure. Even though an aircraft may be cruising at FL350 (35,000 ft), the cabin altitude is maintained at a much lower level.

• Typical cabin altitude for modern jets: 6,000–8,000 ft
• Boeing 787 maintains a lower cabin altitude (~6,000 ft) due to composite fuselage strength
• Maximum certified cabin altitude is typically 8,000 ft (per FAR 25.841)
• If cabin altitude exceeds 10,000 ft, supplemental oxygen is required for crew
• At 14,000 ft cabin altitude, passenger oxygen masks deploy automatically