If a pilot changes the altimeter setting from 30.11 to 29.96, what change in altitude will the altimeter indicate?

When a pilot changes the altimeter setting from a higher pressure reading (30.11 inches of mercury) to a lower pressure reading (29.96 inches of mercury), the altimeter will indicate a lower altitude. This is because altimeters measure altitude by comparing the atmospheric pressure to a baseline pressure, and lower pressure values correspond to higher altitude.

The difference between the two pressure settings is 0.15 inches of mercury (30.11 - 29.96). Each 0.01 inches of mercury change is equivalent to approximately 28 feet of altitude change. Therefore, a change of 0.15 inches results in a drop of approximately 150 feet (0.15 divided by 0.01 equals 15, and 15 multiplied by 10 equals 150).

Thus, when the altimeter setting is adjusted from 30.11 to 29.96, it reflects that the aircraft is at a lower altitude than previously indicated, resulting in an indication of 150 feet lower altitude.