Originally Posted by
1peter
Very basic question from a student: GA pilots are urged to fly 5,000 or below at night, in order to preserve night vision. As many large transport jets can not pressurize to anywhere near 5,000, why do transport pilots get to fly at night? Is night vision less important in transport flying? Example: Boeing 767, 6,900' cabin pressure at 39,000'.
The cabin altitude on most transport aircraft is only at that level in cruise. By the time night vision is a factor during approach the cabin has been below 5000 for at least 20 minutes and probably at field elevation for the actual approach.