Ron Natalie wrote
Garner Miller wrote:
Depends on the airliner, of course. Some turboprops have the cabin as
high as 10,000 feet at their service ceiling. That's the highest I've
seen.
Not anything certified in the transport class.
Following up.............
Section 25.841: Pressurized cabins.
(a) Pressurized cabins and compartments to be occupied must be equipped to
provide a cabin pressure altitude of not more than 8,000 feet at the
maximum operating altitude of the airplane under normal operating
conditions.
(1) If certification for operation above 25,000 feet is requested, the
airplane must be designed so that occupants will not be exposed to cabin
pressure altitudes in excess of 15,000 feet after any probable failure
condition in the pressurization system.
(2) The airplane must be designed so that occupants will not be exposed to
a cabin pressure altitude that exceeds the following after decompression
from any failure condition not shown to be extremely improbable:
(i) Twenty-five thousand (25,000) feet for more than 2 minutes; or
(ii) Forty thousand (40,000) feet for any duration.
Bob Moore
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