Originally Posted by
PEI_3721
FW ‘…
right place at the right speed is more important …’
vilas, you words “small”, “critical”, #13, could mask the importance of the approximation by falsely assuming sufficient accuracy.
When does ‘small’, ‘critical’ matter. If the approximation is critical, then to know this requires knowledge of the difference between not-critical and important.
I assume that your “…
LDR figures are given for max LW” relates to the max LW in conditions at the time of assessment; configuration, runway braking action, choice of auto-brake setting, etc.
“
Nothing is achieved by being so accurate for a ton or less”, but this could be the vital factor in combination with other approximations or mistaken values; e.g. normal range of error in wind speed, braking action vs wet or very wet, type of runway surface, depth of tyre tread, plus the variable human.
My comments are on difference of few tons of weight. Don't you use factored landing distance? That will take care of that difference. One ton extra increases Vapp by 1kt. Do you fly that accurately? If you don't have twenty or thirty meters extra you should not be landing there.