The acceleration that Earth's gravitational field exerts on objects at Earth's surface (9.8 m/sec2). Also used as a stress measurement for bodies undergoing "loads" imposed on an aircraft or pilot. Loads may be centrifugal and aerodynamic due to maneuvering. (For example, 7 g is a load 7 times the weight of the aircraft. A typical person can handle about 5 g (50m/s2) before losing consciousness. Modern pilots can typically handle 9 g (90 m/s2).