What is the cabin altitude of the 777?

The 777's cabin altitude is 2430 meter (8000 ft) when it's cruising at max altitude. Wolfram Alpha tells us that a cubic meter of air weighs 0.96 kg at that pressure. DimensionInfo shows that the 300ER is 73.9 m long and 5.86 m wide. So that's about 1900 kg of air for the cylinder.



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The Cabin Altitude of a pressurised aircraft is normally maintained at and altitude of 8,000 ft or less as a compromise between the physiological needs of the crew and passengers and the structural limitations of the aircraft.

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Based on that knowledge, the 787 is pressurized to a maximum cabin altitude of 6,000 feet. In cooperation with Denmark Technical University, Boeing challenged the assumption that simply increasing humidity would alleviate complaints about dryness on airplanes.

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The pressurisation system of all series of 737 ensures that the cabin altitude does not climb above approx 8,000ft in normal operation.

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For Part 91 General Aviation operations the required flight crew must use supplemental oxygen for any portion of the flight that exceeds 30 minutes above a cabin pressure altitude of 12,500 feet mean sea level (MSL) up to and including 14,000 feet (MSL).

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So what's the best altitude to minimize your exposure to moderate or greater turbulence? Well, considering both in-cloud and out-of-cloud turbulence, flight between 8,000 and 12,000 feet will allow for the smoothest ride, on average.”

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How high can you fly without a pressurized cabin? Most planes flying today use a cabin pressure control system that ensures safe and normal breathing for everyone onboard during flight. The general rule is that planes should have cabin pressurization when they go above 10,000 to 14,000 feet.

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What makes the plane so expensive? The 777-300ER can carry 365 passengers compared with the 787-9's capacity of 280. The GE engines on the 777 model develop 62% more thrust than the 787's two engines. The plane is also longer than the Dreamliner, has a greater wingspan and a greater wing area, and is taller.

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From a practical point of view, 'high altitude' operations are taken to be those above FL250, which is the altitude at above which aircraft certification requires that a passenger cabin overhead panel oxygen mask drop-down system has to be installed.

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The regulations2,3 stipulate that the maximum cabin altitude should not exceed 8000 feet during normal operations, and, in fact, at usual cruising altitude the cabin altitude rarely exceeds 6000 or 7000 feet in a modern jet airliner.

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A major reason for flying at that altitude is money; After labor, fuel is the greatest expense for airlines. That's why airlines are constantly working to maximize their fuel efficiency. Cruising at 36,000 feet helps with that. The higher altitude means thinner air.

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There are no specific regulations governing civil aircraft operations beyond the altitude of 60,000 feet. Nevertheless, certain exceptional aircraft like the Concorde and the Tupolev Tu-144 have managed to ascend to altitudes of FL600 (equivalent to 60,000 feet).

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All the reasons private jets fly at a higher altitude are for increased safety and to reach their destinations faster.

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For one, the Airbus A380 has almost double the space onboard compared to the Boeing 777 series, thanks to its second level. This means the airline can afford to be a little more abundant with its first class and business class offerings onboard the A380 compared to the Triple Seven.

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