What is the maximum ITT range during start for a duration of five seconds?

The maximum ITT (Interstage Turbine Temperature) range during start for a duration of five seconds is correctly identified as being 871 to 1,000 °C. This is an important operational limit for the T-6 aircraft, as exceeding ITT limits can lead to engine damage or performance issues.

During the engine start phase, ITT can experience transient spikes due to fuel ignition and combustion processes. The specific range of 871 to 1,000 °C is set to ensure that the engine can start effectively while maintaining safety and operational integrity. These limits are defined by the manufacturer based on extensive testing and operational experience to prevent overheating during such critical operations.

In contrast, other temperature ranges provided do not align with the maximum allowable ITT for a five-second duration during engine start, making them noncompliant with operational standards. Knowing these temperature limits is essential for safe and effective aircraft operation, particularly for maintaining engine health during the start sequence.