Wizball

Flight level change and N1

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Hello

Is there any known issues with flight level change and thrust/N1 ? Or is it error between keyboard and chair ?

N1 does not go to the max. In this case N1 is stopping at 77%.

 

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FLCH commands thrust to achieve the selected altitude in no less than 120 seconds IIRC, so for relatively small altitude changes it will not command full CLB thrust.

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10 minutes ago, Wizball said:

In this case N1 is stopping at 77%.

Based upon what Simon Kelsey said above and that fact the airplane is very light (Gross Wt 247000 kgs from EICAS) I would not expect N1 to go any higher.

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5 minutes ago, skelsey said:

FLCH commands thrust to achieve the selected altitude in no less than 120 seconds IIRC, so for relatively small altitude changes it will not command full CLB thrust.

Interesting.  I did try a FL CH with a bigger altitude difference, and your right, it will command full climb thrust when doing that. 

Not the behaviour im used to or expected. But a smooth logic.

Thanks for the explanation.

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