What is the maximum N1 percentage allowed for take-off?

• A. 100.1-103.2% for 5 minutes
• B. 103.2% for 10 minutes
• C. 95-100%
• D. 103.8% for 30 seconds

Answer: (A)

The maximum N1 percentage allowed for take-off is a critical aspect of engine management, particularly in the TH-73A. The correct answer indicates that the N1 can be maintained between 100.1% to 103.2% for a duration of up to five minutes during take-off. This range provides operators with flexibility while ensuring engine performance remains within safe operational limits for an essential phase of flight.

Maintaining N1 within this specified range allows for optimal engine output required for takeoff, contributing to safety and performance. It also reflects a trade-off between maximum thrust and engine longevity. Exceeding specified N1 thresholds for excessive durations can lead to engine wear or failure, which is why these limits are precisely defined.

In contrast, other choices propose different percentage ranges that exceed recommended limits or are not suitable for the specific time duration and conditions required during take-off. Thus, choice A reflects the appropriate operational guidelines that are crucial for the safe and effective use of the TH-73A during takeoff.