When outside temperature < -9 C in icing conditions, what is the maximum total time for throttle N1 usage?

When outside temperature < -9 C in icing conditions, what is the maximum total time for throttle N1 usage?

• A. 60 minutes
• B. 50 minutes
• C. 30 minutes
• D. 75 minutes

Answer: (B)

In icing conditions, when the outside temperature is colder than -9 C, there is a safety limit on how long you can hold high thrust in the engines. The maximum total time for throttle N1 usage in this scenario is 50 minutes. This limit helps manage ice buildup and the risk of ice shedding into the engine, which can threaten engine stability and performance. So you should plan to stay within that 50-minute window, and if you approach it, reduce thrust or exit the icing conditions to remain within safe operating limits. The other time options don’t match this specified limit for these temperatures.

In icing conditions, when the outside temperature is colder than -9 C, there is a safety limit on how long you can hold high thrust in the engines. The maximum total time for throttle N1 usage in this scenario is 50 minutes. This limit helps manage ice buildup and the risk of ice shedding into the engine, which can threaten engine stability and performance. So you should plan to stay within that 50-minute window, and if you approach it, reduce thrust or exit the icing conditions to remain within safe operating limits. The other time options don’t match this specified limit for these temperatures.