How long does AHRS take to initialize on the ground?

How long does AHRS take to initialize on the ground?

• A. 60 seconds
• B. 70 seconds
• C. 80 seconds
• D. 90 seconds

Answer: (B)

AHRS initialization on the ground is the process of locking in attitude and heading references by sampling gravity and magnetic data while the airplane is stationary and powered. The sensors need a moment to settle and the alignment algorithms to converge on a stable reference frame. On the ground, this alignment typically takes about seventy seconds. That duration is long enough for a reliable reference to be established, so the flight instruments, autopilot, and navigation aids display accurate attitude and heading once complete. A shorter time wouldn’t give the system enough data to converge, while a longer time would exceed the standard ground alignment window. So, about seventy seconds is the best answer.

AHRS initialization on the ground is the process of locking in attitude and heading references by sampling gravity and magnetic data while the airplane is stationary and powered. The sensors need a moment to settle and the alignment algorithms to converge on a stable reference frame. On the ground, this alignment typically takes about seventy seconds. That duration is long enough for a reliable reference to be established, so the flight instruments, autopilot, and navigation aids display accurate attitude and heading once complete. A shorter time wouldn’t give the system enough data to converge, while a longer time would exceed the standard ground alignment window. So, about seventy seconds is the best answer.