What condition must the pilot and co-pilot Air Data Computers be in for takeoff?

For takeoff in a King Air 350, the air data computers must be operative. This requirement is crucial because these computers provide essential flight data, including altitude, airspeed, and vertical speed, which are necessary for safe operation of the aircraft during takeoff. If the air data computers are not functioning properly, the pilot could receive inaccurate performance data, increasing the risk of a mishap during this critical phase of flight.

The operativeness of both the pilot and co-pilot computers ensures redundancy and reliability, allowing for cross-checking of vital flight parameters. This is particularly important in multi-pilot operations where situational awareness is enhanced by verifying data from both computers.