What is the highest permissible N1 percentage for maximum take-off?

• A. 103.2% for 5 minutes
• B. 108% for 10 seconds
• C. 100.1-103%
• D. 95-100%

Answer: (A)

The highest permissible N1 percentage for maximum take-off in the TH-73A is 103.2% for a duration of 5 minutes. This specification allows for a temporary increase in engine speed above the normal operating range to enhance performance during critical phases like take-off. The defined limit of 103.2% ensures that the engine can safely operate at this high throttle setting without causing damage, provided it is within the specified time frame. This ensures adequate thrust while managing engine temperature and stress levels effectively.

The other options represent either operational limits that do not align with maximum approved settings or offer different durations that are not suitable for sustained maximum performance. The specification for maximum take-off N1 is critical for flight safety and performance optimization during take-off, making it essential knowledge for pilots and personnel operating the TH-73A.