What is the transient ITT limit during takeoff?

• A. 5 seconds
• B. 10 seconds
• C. 2 seconds
• D. 6 seconds

Answer: (A)

The transient ITT limit during takeoff is crucial for ensuring engine safety and performance. In the context of the TH-73A, during takeoff, a transient ITT (Interstage Turbine Temperature) limit allows for a maximum temperature increase that can occur for a specified duration without resulting in damage to the engine.

The transient ITT limit is established at 5 seconds, meaning that the engine can safely operate at this higher temperature for a brief period when under heavy power demands, such as during takeoff. This limit is designed to provide full power when needed while keeping the engine within safe operational parameters. Such provisions in engine operation are vital for aircraft performance in critical phases of flight like takeoff.

Understanding this limit is essential for pilots and maintenance personnel to ensure they adhere to safe operational practices while managing engine temperatures effectively during critical flight phases.