Hiya
According to JAR-OPS, for dispatch (planning the flight) AND in the event of in-flight replanning, your required landing distance for DRY rwy is the actual landing distance (at the expected landing weight) multiplied by 1.67
This means you must be able to stop within 60% of the available rwy length. For WET runway, add another 15% to the DRY figures. This equals about 1.92 times actual landing distance for DRY runway.
In-flight, the commander must be satisfied that a safe landing can be carried out considering the actual weight, rwy condition, weather etc.
In-flight replanning according to JAR-OPS- what does this mean? In my opinion, a change of destination. Perhaps prompted by Operations, in order to pick up stranded passengers? If anyone has a definition, please post it. Clearly, in the in-flight case there is room for interpretation. Maybe that's why we haven't been replaced by machines yet?!
