747-468 FMS Calculation of Opt/Max Altitude
I'm curious about how the 400 FMS calculates step-climbs & opt/max altitudes. I have a sneaking suspician that ISA Dev is not a factor, but can't prove it. When forcast winds & temps are entered, 1) do these entered temps affect time/distance-to-go to opt step time, or 2) is it just present temp, or 3) is temp (both entered & measured) totally ignored? I have the Honeywell Pilot's Guide, and temp factors aren't mentioned; just weight & wind. (I assume the 777 DOES use temp devs; the 400 FMS, being earlier & cruder, may not).