Flap and slat lock
Heya guys,
So let's say we have a flap or slat lock. Or both. The pitch attitude on approach is higher (increased angle of attack) and we fly at a higher Approach speed. If we fly a standard ILS without any failures, then we come down at 700FPM 2.5 degrees for a standard jet transport approach. With the failure of the high lift devices we fly faster and to stay on the fixed glide path then we select a higher rate of descent to maintain the glide with a high pitch attitude. My question is, why do we require less flare to arrest the rate of descent. I am aware of the tail strike implications of this failure. But the FCTM says you will require less flare (understandable for tailstrike risk) but surely to reduce the higher rate of descent then you need a larger pitch increment rather than a smaller one? (Forgetting any tail strike implications) I'm sure there is something simple I'm missing, but I did get up at 3am so please forgive me! |
So let's say we have a flap or slat lock. Or both. The pitch attitude on approach is higher. |
but surely to reduce the higher rate of descent then you need a larger pitch increment rather than a smaller one? If you were on a 3 degree glide slope and didn't reduce the speed during the flare, then you would need to increase pitch by 3 degrees to fly level - no matter what your ROD was before hand. |
Higher ROD/Speed = An aircraft carrying more ENERGY. You require less elevator input because the elevator is more sensitive due to the high(er) energy situation.
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...the elevator is more sensitive due to the high(er) energy situation |
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