FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

When the aircraft altimeter is set to 29.92" Hg on the ground, it is calibrated to read pressure altitude. Pressure altitude is the height above the standard datum plane where the atmospheric pressure is 29.92" Hg. This setting allows for a standard reference point for altitude measurement in the atmosphere. Therefore, choosing pressure altitude as the correct answer corresponds to the specific calibration and reference point set by adjusting the altimeter to 29.92" Hg on the ground.