What is the maximum ITT during the starting power setting?

• A. 750 degrees F
• B. 820 degrees F
• C. 871-1000 degrees F (5 seconds)
• D. 800 degrees F

Answer: (C)

The correct choice identifies the maximum Interstage Turbine Temperature (ITT) during the starting power setting as 871 to 1000 degrees Fahrenheit for a duration of up to 5 seconds. This temperature range represents the critical limit for safe operation of the engine during the start phase, where higher temperatures can occur due to the increased fuel flow and the nature of the start cycle. The 5-second allowance is specifically important, as it indicates that while the engine can tolerate this elevated temperature for a brief period, prolonged exposure to these temperatures could lead to engine damage.

Understanding that the start sequence involves high initial fuel flow and ignition can clarify why this range is acceptable for such a limited time. It reflects the engine's design to handle these transient conditions while ensuring that operators maintain vigilance over the ITT readings to prevent overheating during engine start and subsequent operations. Other choices either fall short of this critical range or extend beyond the limits that the engine is designed to handle during initial startup.