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.
RTTY & Facsimile Equipment. ACARS (Aircraft Communications Addressing and Reporting System) is a radioteletype mode developed in the early eighties as an addressable, digital data link for commercial and business aircraft. It was produced to reduce the flight crew's work-load by using modern computer technology to exchange many routine reports and messages.