HEIR, GENERAL. Heir at common in the English law. The heir at common law is he who, after his father or ancestor's death has a right to, and is introduced into all his lands, tenements and hereditaments. He must be of the whole blood, not a bastard, alien, &c.
An air data computer (ADC) is a avionics component that assimilates the inputs from an aircraft's external and system sensors and returns a series of calculated results critical to the control of the aircraft. In one compact package, the air data computer performs what a bank of individual instruments were once required to do. Almost all the flight-related information displayed in newer commercial aircraft fitted with glass cockpits is compiled by an air data computer.
The instrumental accuracy of such air data computers is usually approx. +/- 15 m in the zero altitude above sea level, whereas in mechanical altimeters, the value approx. +/-6 m is usually mentioned. The great accuracy of the modern air data computers has enabled to established a new system of the flight levels, the so called Reduced Vertical Separation Minimum (RVSM).