What kind of numbers do you usually run before approach?
Well, us being a Part 135 charter operator..we have a few things we have to do.
Landing distance.
Landing distance 135 (within 60% of the runway)
Corrected landing distance (contaminated runway)
Those are all generally done prior to accepting a trip. For our jets we have to run a "performance analysis" and clear it with the chief pilot if the field is less than 5000' or if the field elevation is greater than 3,000'. For the King Airs we have to do it if the field is less than 4,000'. The performance analysis basically is just a check that we can legally land at the field since it is getting closer to the margins of the 60% rule (landing within 60% of the available runway). Prior to departure we also look at things like wet or snowy runways, go into our Section 7 of the Flight Manual and look up the contaminated runway correction factors. Sometimes those numbers get ridiculous (ie: multiply landing distance x 2.2 for snow less than 1" or something like that). So we can't go into some fields with snow or ice even if they are 6 or 7-thousand feet long..despite knowing full well that we can get the aircraft stopped easily. Them's the rules though.
Prior to approach we do a typical TOLD card for the landing numbers. Calculate landing weight, approach speed, Vref, single engine go-around, fan speed (both single and two-engine).. That's about it (I'm sure I'm missing something but I don't have a TOLD card in front of me right now..
