How long is the start time for the first and second engine starts on the ground?

The first and second engine starts on the ground are designed to have a maximum allowable start time of 90 seconds. This duration is important because it ensures that the engines are given sufficient time to ignite and stabilize before moving into further operational phases. Exceeding this time could risk potential damage to the engine or lead to operational inefficiencies. Adhering to this time limit is part of maintaining safety and proper engine performance during ground operations.