What is the minimum battery voltage required for engine start?

The minimum battery voltage required for engine start in a King Air 350 is 24 volts. This voltage is critical because it provides the necessary electrical power to the starter motor, allowing the engines to crank effectively. If the voltage is below this threshold, the starter may not engage properly, leading to difficulties in starting the engines. This requirement ensures that the battery can deliver sufficient energy to initiate engine operation, which is essential for flight safety and reliability. Operating below this voltage could result in a failure to start the engines or could lead to other electrical issues during start-up.