AHRS 1 and 2 need to be in what condition prior to takeoff?

For safe and proper operation of the King Air 350, it is essential that both AHRS (Attitude and Heading Reference Systems) 1 and 2 are in an operative condition prior to takeoff. These systems are crucial for providing accurate attitude and heading information to the pilots. If the AHRS units are not functioning correctly, the pilots may not have reliable data for navigation and aircraft control, which could compromise flight safety.

Ensuring the AHRS systems are operative means they are fully functioning and calibrated. This readiness allows for accurate performance during flight, particularly during critical phases like takeoff and landing, where precise aircraft orientation and heading information is vital. Checking your instruments and ensuring they are in good working order is a standard practice in aviation to promote safety and reliability.