Which throttle profile matches outside temperature greater than -2 C?

Which throttle profile matches outside temperature greater than -2 C?

• A. 70% N1 for 10 seconds every 30 minutes
• B. 70% N1 for 10 seconds every 10 minutes
• C. 70% N1 for 10 seconds every 15 minutes
• D. 70% N1 for 10 seconds every 20 minutes

Answer: (A)

When outside temperature is above -2 C, icing risk is low, so the throttle routine should be light but still keep the engine and systems primed without unnecessary wear. Running the engine to 70% N1 for about 10 seconds every half hour provides just enough periodic exercise to prevent sticking or varnish buildup and to keep hydraulic and pneumatic systems ready, while avoiding extra fuel burn and added thermal stress from more frequent or longer bursts. The other profiles would involve more frequent or longer power application, which isn’t required under these warmer conditions and would waste fuel and create extra wear.

When outside temperature is above -2 C, icing risk is low, so the throttle routine should be light but still keep the engine and systems primed without unnecessary wear. Running the engine to 70% N1 for about 10 seconds every half hour provides just enough periodic exercise to prevent sticking or varnish buildup and to keep hydraulic and pneumatic systems ready, while avoiding extra fuel burn and added thermal stress from more frequent or longer bursts. The other profiles would involve more frequent or longer power application, which isn’t required under these warmer conditions and would waste fuel and create extra wear.