What is the engine starter duty cycle limit for the 3rd through 5th attempts on the ground?

The engine starter duty cycle limit specifies how long the starter can be engaged and how long it must rest to avoid overheating and damaging the starter motor. For the ERJ 170/175, the limits for the 3rd through 5th attempts while on the ground is defined as a maximum engagement time of 120 seconds followed by a rest period of 5 minutes.

This management of starter engagement time and rest periods ensures that the starter has adequate time to cool down after each use, particularly after multiple attempts. This procedure is crucial for maintaining the longevity and reliability of the starter system as well as ensuring safety during ground operations.

The other options do not align with the manufacturer’s specified limits for this aircraft configuration.