Question regarding Actual and available Landing distance...
Here's a Question that came up the other day:
In a normal situation, lets say that the Actual Landing Distance of an a/c (ALD) is 2500 ft. The Required Available Landing Distance (*1.67%) would be 4175 feet.
Now, for the sake of the example, lets say there was a warning msg of degraded brakes and the QRH instructs you to add 1.55 to your ACTUAL landing distance.
Is your now Actual landing distance 2500 * 1.55 = New Actual Landing Dist ? = 3875 ft? And then add onto that *1.67 = 6471 ft - New Required runway available?
- or -
does the Original Actual Landing Dist * 1.55 fall into the the already enough Available runway required, which is the Original Actual * 1.67?
Your thoughts are as always, highly appreciated.
Cheers!