Found the supplement after lots of searching - AS350 B3 Supplement 9-28 "Increased maximum internal gross weight to 2370 kg." Aircraft must be equipped with high landing gear and dual hydraulics.
The hydraulics is self-explanatory. The high skid option, however, I believe (after discussing with my colleagues) is because of the autorotation performed in the takeoff portion of the flight. With low skid, there might not be enough kinetic energy to safely cusion the landing.
What do you think?
Last edited by tigerpic; 12th May 2009 at 17:58.