Manual cabin dump occurs at approximately what altitude?

Manual cabin dump occurs at approximately what altitude?

• A. 14,200 feet
• B. 13,700 feet
• C. 15,000 feet
• D. 14,000 feet

Answer: (A)

Manual cabin dump is the controlled venting of cabin air to the outside to rapidly bring cabin pressure toward ambient when the pressurization system needs assistance or in an abnormal situation. The system is designed so that initiating the dump at around 14,200 feet cabin altitude yields a meaningful and safe rate of depressurization within the aircraft’s limits. Above this level, venting through the dump valve quickly reduces the cabin pressure to near ambient, helping the crew manage high-altitude conditions or equipment failure. At lower altitudes, the dump action would be less effective or unnecessary, so the approximate threshold used in this aircraft’s procedures is about 14,200 feet.

Manual cabin dump is the controlled venting of cabin air to the outside to rapidly bring cabin pressure toward ambient when the pressurization system needs assistance or in an abnormal situation. The system is designed so that initiating the dump at around 14,200 feet cabin altitude yields a meaningful and safe rate of depressurization within the aircraft’s limits. Above this level, venting through the dump valve quickly reduces the cabin pressure to near ambient, helping the crew manage high-altitude conditions or equipment failure. At lower altitudes, the dump action would be less effective or unnecessary, so the approximate threshold used in this aircraft’s procedures is about 14,200 feet.