What is the maximum duration for Start attempts 2 to 5 on the ground?

The maximum duration for start attempts 2 to 5 on the ground is indeed 30 seconds. This limitation is essential to prevent engine overheating and to ensure the health of the engine during multiple start attempts. Allowing only a brief duration for these attempts helps to avoid potential damage from excessive heat buildup, which can occur if the engine is cranked for too long without starting.

Each start attempt is designed to be a rapid process, and if the engine does not start within the specified time frame, it is crucial to allow for a cooldown period before attempting another start. This cooldown allows the engine components to return to a safe operating temperature, ensuring the reliability and longevity of the engine. In essence, adherence to this limitation protects the engine from unnecessary stress and helps to maintain operational safety and efficiency.