What is the maximum duration for starter attempts 1 and 2 on the ground?

The maximum duration for starter attempts 1 and 2 on the ground is 90 seconds. This limit is set to prevent potential overheating or damage to the starter and engine components during the starting process. Allowing a starter attempt to exceed this time can result in excessive wear or can even compromise the engine start sequence.

After each of the first two attempts, a specific cooldown period is required before another attempt can be initiated. This cooldown, combined with the time limit for the starter attempts, ensures that the engine starts can be performed safely without risking mechanical failure. The guidelines help maintain the reliability of the aircraft's starting system and ensure adherence to manufacturer specifications, which is crucial for safe operation.