What is the maximum ITT for a ground start?

What is the maximum ITT for a ground start?

• A. 815 C
• B. 800 C
• C. 825 C
• D. 830 C

Answer: (A)

During a ground start, the engine is especially at risk of overheating because there isn’t the cooling effect of forward air flow, so the ITT is capped to protect the turbine hot section during the startup sequence. For this aircraft’s engine, the ground-start ITT limit is 815°C. Keeping ITT at or below this value ensures the turbine blades and related components stay within safe thermal limits as fuel is introduced and the engine spools up. This is the best answer because 815°C is the certified maximum for a ground start; values higher than that would exceed the allowed limit and could trigger an over-temperature condition, while a lower value would be within limits but would not reflect the maximum permissible ITT for a start. The higher takeoff ITT limits apply in flight when cooling and airflow are greater, so they’re not relevant to a ground start.

During a ground start, the engine is especially at risk of overheating because there isn’t the cooling effect of forward air flow, so the ITT is capped to protect the turbine hot section during the startup sequence. For this aircraft’s engine, the ground-start ITT limit is 815°C. Keeping ITT at or below this value ensures the turbine blades and related components stay within safe thermal limits as fuel is introduced and the engine spools up.

This is the best answer because 815°C is the certified maximum for a ground start; values higher than that would exceed the allowed limit and could trigger an over-temperature condition, while a lower value would be within limits but would not reflect the maximum permissible ITT for a start. The higher takeoff ITT limits apply in flight when cooling and airflow are greater, so they’re not relevant to a ground start.