Quote:
Originally Posted by Endir1001
This is all nice for T/O, but DA also effects our landing distances, and no one has ever been able to tell me why we don't have to correct for DA changes in computing landing distances...
Think about it, if 2 kts fast over the fence adds about 5% to landing roll, and you are at a 6000' MSL strip in August with temps in the high 90's, then you TAS is going to be up there as you cross the fence.
I know most field lengths are more than sufficient to account for any increases in landing roll due to DA, but what about an abnormal situation, we have no way of calculating the new roll out. Unless DX has it buried somewhere, but I doubt it.
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you have a good point. you can calculate density altitude on the FMS landing page 2, and use that instead of pressure altitude. even without doing that, the landing distances in the charts are in increments of 1000' pressure altitude, so if you look at the next higher 1000' increment your covering the increase due to high temp. between those two methods you're getting a safe estimate of landing distance without taking an unnecessary penalty.