757/767 Drag factor
This may have been covered before, but here goes
On the Ident page on the 757/767 FMC there are 2 factors, Drag Factor and FF (Fuel Flow) factor. Now the FF I know how is found, but how is the Drag Factor found? Is it calculated by maintenance?, the result of flight tests as a sticker in one of our aircraft suggests or...
appreciate any info
regards,
Oceancrosser