What is the minimum time for transient engine ITT after starting?

• A. 2 seconds
• B. 5 seconds
• C. 10 seconds
• D. 15 seconds

Answer: (B)

The minimum time for transient engine Interstage Turbine Temperature (ITT) after starting is 5 seconds. This time is crucial as it allows the engine to stabilize and provides an accurate indication of its operating condition. During the initial moments after starting, the temperatures can fluctuate significantly as the engine reaches a stable operating state.

Requiring a 5-second minimum ensures that the pilot or operator observes a more consistent ITT reading before making any operational decisions. Shorter time frames, such as 2 seconds, might not capture the transient behavior of the engine adequately, leading to potential misinterpretation of the engine's performance.

Setting this standard reflects practices established in the training and operational procedures aimed at ensuring safety and reliability in engine performance monitoring for the TH-73A, thereby helping prevent potential abnormal operation or damage to the engine during this critical phase.