Well... I don’t know the details of the B747 pneumatic system either… and how the PAX configuration differs from the freighter configuration…? I know the KC10’s dropped the “customer bleed” system on the number two engine… due to less ECS demand. "Sick"… when you mentioned 3% fuel burn increase for cargo cooling down to 4 deg C… 3% over what…? Is this a given “Book” value from Boeing…? Is this built into your flight-planning program…? We keep a close eye on the Drag/FF values… especially on the B777’s… to ensure the Drag/FF index in the FMS matches the flight-plan… and these values are updated on a monthly basis to optimize payload… It becomes a challenge when you intermix the conventional GE90’s and the 3D compressor engines… due to substantial difference in fuel burn.
Phil… still no takers here…?
Dag