If the turoprop engine is not flat-rated, the piston DC-3 probably does have pretty good numbers up to (some) altitude (as it's supercharged).
Previously, the -3 was 25200lbs.Max (25346 with deice boots).
Most US DC-3's are now limited to 26200 (pax) or 26900(cargo) Max TO/Max Lndg by their Increased Gross Weight STC performance manual.
Some Part 137(Ag) operators would go up to 31000 or 31500 lbs for TO, like old WWII "war loads", but with a dump system for the chemical.
Last edited by 727gm; 14th Jul 2014 at 04:12.
Reason: clarif.