If an aerodrome has an elevation of 400 feet ASL, what will the altimeter read at circuit height of 1500 feet AGL?

To determine the altimeter reading at circuit height above ground level (AGL) when the aerodrome elevation is known, you need to add the elevation of the aerodrome to the circuit height.

In this scenario, the aerodrome has an elevation of 400 feet above sea level (ASL) and the circuit height is 1500 feet AGL. To find the altimeter reading, you simply sum these two values:

400 feet (elevation ASL) + 1500 feet (circuit height AGL) = 1900 feet ASL.

Therefore, at a circuit height of 1500 feet AGL, the altimeter will read 1900 feet ASL. This reasoning correctly accounts for the elevation of the aerodrome, ensuring that the altimeter reflects the height above sea level.