Private Pilot Private Exam

What is true altitude?

1. The altitude indicated on the altimeter

2. The vertical distance of the aircraft above sea level

3. The same as pressure altitude

4. The altitude corresponding to local barometric pressure

The correct answer is: The vertical distance of the aircraft above sea level

True altitude is defined as the vertical distance of the aircraft above sea level. It refers to the actual height above the average sea level, which is a critical reference point for navigation and safety. In aviation, true altitude is essential for ensuring that an aircraft is flying at a safe height above terrain and obstacles, especially during takeoff and landing phases when precise altitude measurements are vital. This understanding differentiates true altitude from other terms used in aviation, such as indicated altitude (the reading from the altimeter when properly set), pressure altitude (the altitude above the standard datum plane), and density altitude (which is affected by temperature and pressure). Recognizing these distinctions helps pilots navigate more effectively and ensures safer flight operations.