What is the maximum N2 value for take-off?

• A. 103%
• B. 105%
• C. 108%
• D. 101-103%

Answer: (A)

The correct maximum N2 value for take-off in the TH-73A is 103%. This value is critical for ensuring that the engine operates within its safe and efficient limits during the critical phase of take-off. Achieving this N2 percentage allows the helicopter to generate the necessary thrust for lift-off while maintaining engine health and performance integrity.

Operating at or below this limit helps prevent undue stress on the engine components during take-off, ensuring both safety and reliability. Higher values could lead to potential engine overstress or failure under maximum load conditions, which is why the take-off range is capped at 103%. Maintaining N2 within the specified limit ensures optimal performance without compromising safety.