Above 23,000 feet, the pressure setting follows which formula?

Above 23,000 feet, the pressure setting follows which formula?

• A. (alt-6)/2 ± 2k
• B. (alt-4)/2 ± 1k
• C. (alt-5)/2 ± 1k
• D. (alt+6)/2 ± 2k

Answer: (A)

High-altitude pressure setting uses a simple linear adjustment tied to how high you are. The idea is to take altitude in thousands of feet, remove a baseline offset, then scale the remaining amount by half. That gives the central value for the setting as (altitude in thousands of feet minus 6) divided by 2. The ± 2k part provides a tolerance of two thousand feet to cover atmospheric variability. In other words, once you’re above 23,000 feet, the pressure setting follows this rule: central value = (alt - 6)/2, with a band of ± 2k. That’s why the form (alt-6)/2 ± 2k is the correct choice. If you test other forms, you’ll see they don’t match this pattern: subtracting a different baseline (like 4 or 5) would shift the slope wrong, adding 6 changes the relation direction, and a smaller tolerance (±1k) wouldn’t accommodate typical atmospheric variation.

High-altitude pressure setting uses a simple linear adjustment tied to how high you are. The idea is to take altitude in thousands of feet, remove a baseline offset, then scale the remaining amount by half. That gives the central value for the setting as (altitude in thousands of feet minus 6) divided by 2. The ± 2k part provides a tolerance of two thousand feet to cover atmospheric variability.

In other words, once you’re above 23,000 feet, the pressure setting follows this rule: central value = (alt - 6)/2, with a band of ± 2k. That’s why the form (alt-6)/2 ± 2k is the correct choice.

If you test other forms, you’ll see they don’t match this pattern: subtracting a different baseline (like 4 or 5) would shift the slope wrong, adding 6 changes the relation direction, and a smaller tolerance (±1k) wouldn’t accommodate typical atmospheric variation.