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Actual landing distance is established during certification with a firm landing and exuberant efforts at stopping, hence the requirement to factor this distance for mere mortals PRIOR to takeoff.
However, once in flight this factoring is no longer required, you can land on a runway that is the same length as the ACTUAL landing distance. If you have a QRH requirement to factor this distance, you can legally land on that factored runway length.
I understand the test pilot situation and certification, however, I had no idea that once airborne the factor no longer applied.
Are you sure about this?
Obviously in an emergency you have got to do whatever is needed... but lets change the scenario a little. In flight your pax tell you they no longer want to go to your massive 1.67 factored runway and want to go to that tiny little airfield off the left wing. It's LDA is exactly what's stated in your manual. Can you can legally put down there without any factor (assuming the AFM doesn't require it)?