Final answer:
The IR in ADIRS stands for Inertial Reference and is part of the Air Data Inertial Reference System which provides important navigation data to pilots, including aircraft attitude, speed, and altitude using gyroscopes and accelerometers.
Step-by-step explanation:
The IR in ADIRS stands for Inertial Reference. ADIRS is an acronym for Air Data Inertial Reference System. This system provides critical flight data to pilots, including aircraft attitude, speed, and altitude. The inertial reference part of the system is particularly important for understanding the aircraft's position and movement without relying on external references. It utilizes gyroscopes and accelerometers to calculate the aircraft's orientation (pitch, roll, yaw), heading, and ground speed, which is pivotal for navigation, especially when the plane is out of range of traditional navigation aids or in the case of GPS failure. The air data component of ADIRS is responsible for measuring parameters related to the aircraft's interaction with the air outside, such as airspeed, temperature, and barometric pressure, which can then be used to calculate true airspeed and altitude. Together, these components of the ADIRS function to improve flight safety and efficiency