How many minutes must you wait after the fourth start attempt according to the T6 operations limits?

The correct answer is 30 minutes, which is aligned with the T6 operations limits specific guidelines. According to these guidelines, after multiple unsuccessful start attempts, there is a mandated cooldown period to prevent damage to the engine. The engine's ignition and start components undergo stress during these attempts, and a 30-minute wait allows for cooling and reduces the likelihood of further mechanical issues.

Understanding this cooldown period is essential for maintaining operational integrity and ensuring safety in aircraft operations. It reflects the need to respect the manufacturer's recommendations and operational limits, which are based on engineering assessments of the potential for overheating and other types of failures.