So if we assume a constant altitude of 43,000 (the 787's service ceiling 1), we would get a maximum differential of: 6,000 ft Cabin Altitude = 9.06 psi. This is the altitude of the aircraft… var year = today.getFullYear() // The "Set Aircraft Alt" control works the opposite way: you set the aircraft altitude at which the pressurization system reaches maximum pressure , and the cabin alt readout shows you what the cabin altitude will be at that point. Most bad weather is at lower altitudes. Some people have problems with this cabin pressurization, especially if they have had sinus-related conditions before the flight. Thus a cabin altitude of zero would have the pressure found at mean sea level, which is taken to be 101.325 kilopascals (14.696 psi). The aircraft is pressurized by bleed air from the engines which is distributed by the air conditioning system. This system pumps air into your aircraft that is adequately sealed to limit the rate at which this air escapes from the airplane cabin. capable of high-altitude flight. On July 17, 1962, American test pilot Robert White took the X-15 to an altitude of 314,688 feet. Most airline aircraft have a maximum cabin altitude of 8000 feet above sea level, with a humidity level of 4-6%. var gaJsHost=(("https:"==document.location.protocol)?"https://ssl.":"http://www. Maximum cabin pressure differential (difference between inside and outside presssures) can be 8.35 PSI. Your aircraft, and cabin pressurization, has been climbing as the outside pressure has been falling and the temperature is getting colder. // COPYRIGHT DATE FUNCTION // Cabin pressure is usually allowed to climb gently to an automatic or manually preset altitude. The atmospheric pressure falls from 14.7 pounds per square inch (PSI) at sea level, to about 4 PSI at altitude. Still looking for something? Pilots often misunderstand the high-altitude endorsement. function copyrightDate() // Maximum cabin pressure differential (difference between inside and outside presssures) can be This climb (and descent) rate is usually 300-500 feet per minute. High performance airplane pressurization system A cabin pressurization system typically maintains a cabin pressure altitude of approximately 8,000 feet at the maximum designed cruising altitude of an aircraft. This is defined as the equivalent altitude above mean sea level having the same atmospheric pressure according to a standard atmospheric model such as the International Standard Atmosphere. Certain knowledge elements of high-altitude flight are essential for the pilots of these aircraft. For example, the flight crew may select to maintain a cabin altitude … This maximum operating altitude is determined by flight, structural, powerplant, functional, or equipment characteristics. Normally, the Eustachian tubes in your ears are open, allowing pressure to equalize between the outer and middle ear. Mach has no dimension. { // Look at other dictionaries: rated altitude — noun The height, measured in the international standard atmosphere, at which an aero engine delivers its maximum power • • • Main Entry: ↑rate … Useful english dictionary. Based on that knowledge, Boeing designed the 787 to be pressurized to a maximum cabin altitude of 6,000 feet. The outcome of his expedition was predictable, and at autopsy he was found to have ingested quite a lot of alcohol with some marijuana, as well, likely explaining his ill-advised expedition. The Pressurization Controller. (2) Whenever a pressurized aircraft is operated at altitudes above 25,000 feet through 35,000 feet MSL , unless each pilot has an approved quick-donning type oxygen mask -