What is the maximum allowable temperature for ITT in seconds without attempting a restart?

The correct answer is based on the specific operating limits outlined for the T-6A aircraft regarding the Maximum ITT (Interstage Turbine Temperature). The T-6A has a limitation of 5 seconds for maximum allowable ITT temperature without an attempt to restart the engine. Operating beyond this time at elevated temperatures could lead to significant engine damage or failure. This protocol is essential to maintain the integrity of the engine components by preventing thermal stress.

In the context of the other options, durations of 10 seconds, 15 seconds, or 20 seconds represent extended periods that exceed the guidelines for safe operational practices in this scenario, which is crucial for maintaining engine health and ensuring pilot safety.