What percentage for N1 is allowed transiently for 30 seconds?

• A. 100.1-103%
• B. 103.8%
• C. 99%
• D. 101-103%

Answer: (B)

The correct answer indicates that 103.8% N1 is the transient limit allowed for a maximum duration of 30 seconds. This regulation is crucial for safe operations in the TH-73A and reflects the aircraft's engineering design parameters, ensuring that temporary exceedance of this limit does not compromise engine integrity or safety.

Transient power settings are typically defined for specific, short-duration situations where temporary increases in engine performance are necessary, such as during certain flight maneuvers or in response to environmental conditions. By allowing this brief exceedance, pilots can ensure optimal performance without causing long-term damage to the engine components.

While the other options present N1 percentages that may seem plausible, they either do not meet the defined transient specifications or suggest erroneous allowable limits that could lead to misunderstandings about engine operation. Teaching and adherence to the defined limits is essential for effective and safe flight operations in the TH-73A.