Final answer:
A fast alignment on the ADIRS panel, part of an aircraft's avionics system, is a procedure used to reduce alignment time, with requirements such as a known position and aircraft immobility for accurate data.
Step-by-step explanation:
The question pertains to the ADIRS panel which is part of an aircraft's avionics. ADIRS stands for Air Data Inertial Reference System, a crucial component in modern aircraft that provides essential data for navigation and flight control. A fast alignment of the ADIRS is a procedure used to reduce the time it takes for the system to become fully operational and provide accurate position data.
In order to perform a fast alignment, certain conditions must typically be met such as the aircraft being on a known position, not moving, and often with GPS aiding. Depending on the aircraft and the avionic system's design, the fast alignment process might involve selecting the fast align option on the ADIRS control panel and confirming the current position of the aircraft. This can decrease alignment times significantly compared to a full alignment, which may be beneficial in scenarios where quick aircraft turnaround is needed.