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.
PCM (Power Train Control Module). The powertrain or engine control module is a powerful computer that manages the engineâs ignition, fuel injection, and emission systems. In some vehicles, it may also control the operation of the automatic transmission and the anti-lock brake system. Symptoms of Wear or Failure. A PCM can be mistakenly replaced when there was actually a defective engine sensor that was overlooked in the initial diagnosis. 2  The terms PCM and ECM/U (engine control module/unit) are commonly used interchangeably.