Old 744 Forum

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Registered: Jul 2014
Posts: 57
Registered: May 2009
Posts: 5140
If you look at the EICAS flight control surface position indications, you will see that the surfaces have a slight inertia; they don't reach the commanded position instantly at all.

To see what I mean, move a control from one extreme to the other -- instantly. The full response will take a fraction of a second. If you move it only a tiny little bit, you won't see the lag.

If you expect even more inertia, you expect too much inertia. The hydraulic power transfer is pretty quick.

If you want to see (to demo) a slower response from the hydraulics, shut down a few hydraulic systems and watch the indications: the movement will be slower. Also, the aerodynamic effect will be lower if, for example, only half of the entire elevator surface is operative.

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