Final answer:
A flashing ALIGN light on the IR (Inertial Reference) light of the ADIRS panel indicates an alignment issue, where the Inertial Reference system may not be correctly calibrated. This usually happens if the aircraft is not stationary or if incorrect position data has been entered, and it may signal a need for maintenance if the issue persists.
Step-by-step explanation:
The ADIRS panel refers to the Aircraft Data Inertial Reference System panel, which is a component of the avionics in modern aircraft. The ADIRS is critical for providing the plane's flight control systems with accurate data regarding its attitude, position, and velocity. When a pilot observes a flashing ALIGN light on the IR (Inertial Reference) selection on this panel, it indicates that the Inertial Reference system is not properly aligned. Typically, this happens when the aircraft is not stationary or the alignment process has been interrupted or failed due to input of incorrect parameters, such as the aircraft's current position.
For a successful alignment, the aircraft must be stationary, and the correct position coordinates must be entered into the system. The duration of alignment can vary depending on whether it is a full alignment or a quick alignment. A full alignment generally takes longer but is necessary when the aircraft has been relocated since the last shutdown. During alignment, pilots avoid interfering with the aircraft so as to not disrupt the process.
If the ALIGN light continues to flash beyond the normal alignment time, it may suggest technical issues that require maintenance attention. Pilots must adhere to standard operating procedures and possibly consult the aircraft's maintenance manual for guidance on correcting the issue or determining if the aircraft is suitable for flight.