A passenger with a medical pre-condition asks about the effective cabin altitude one would normally be exposed to if flying in a commercial airliner. What should the pilot answer?
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A
The cabin altitude in cruise reaches approximately 3000 ft above the altitude of the departure airport, with a general maximum of 6000 ft.
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B
At cruising altitude the cabin is pressurised to a cabin altitude of approximately 6000 ft, with a general maximum of 8000 ft.
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C
While in cruise, the cabin altitude is about 15% of the flying altitude, with a general maximum of 5000 ft.
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D
The cabin altitude is mainly dependent on the cruising altitude and can reach up to 10 000 ft.
The "cabin altitude" in commercial aircraft should not exceed 8 000 feet in normal operations, but in practice is typically between 6000 and 7500 feet.
PRESSURISATION
CS 25.841 Pressurised cabins
(a) Pressurised cabins and compartments to be occupied must be equipped to provide a cabin pressure altitude of not more than 2438 m (8000 ft) at the maximum operating altitude of the aeroplane under normal operating conditions. If certification for operation over 7620 m (25 000 ft) is requested, the aeroplane must be able to maintain a cabin pressure altitude of not more than 4572 m (15 000 ft) in the event of any reasonably probable failure or malfunction in the pressurisation system.
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This question has appeared on the real examination, you can find the related countries below.
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Cyprus1
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Hungary1
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Malta1
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United Kingdom1
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