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9. (Refer to Figure 8.) Determine the pressure altitude at an airport that is 3,563 feet MSL with an altimeter setting of 29.96.
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'1. Since the altimeter setting that is given is not shown in FAA Figure 8, interpolation is necessary. Locate the settings immediately above and below the given value of 29.96″ Hg:
Altimeter Setting Conversion Factor
29.92 0 feet
30.00 -73 feet
2. Determine the difference between the two conversion factors: 0 — 73 = -73 feet
The setting 29.96 is halfway between the two values, so: -73 ÷ 2 = -36.5 feet
3. Determine the amount of difference to be subtracted from the 30.00″ Hg conversion factor.
4. Subtract the correction factor from the airport elevation to find pressure altitude: 3,563.0 — 36.5 = 3,526.5 feet MSL (pressure altitude)