How long does AHRS initialization take on the ground in magnetic mode?

The initialization of the Attitude and Heading Reference System (AHRS) in magnetic mode on the ground typically takes about 70 seconds. This process is crucial as it allows the system to calibrate itself to the Earth's magnetic field, acquiring the necessary data to provide accurate heading and attitude information.

During initialization, the AHRS aligns its sensors with the magnetic reference field. This period is designed to ensure that the system achieves stability and precision in its readings, accounting for any magnetic interference and compensating for variations in the environment. It is essential for the safe and reliable operation of the aircraft systems that depend on exact heading and attitude data.

The other answer choices suggest either a considerably shorter or longer time to achieve an accurate initialization, which does not align with normal operational protocols for the AHRS in magnetic mode. The process requires a balance between rapid startup and ensuring accuracy, which the specified duration of 70 seconds achieves effectively.