Originally Posted by
illusion
Total fuel 9360kg
Minus fixed reserve of 900kg gives
8460kg
Taxi/takeoff/climb first hour 3000kg gives
5460kg
5460kg/2200 per hour burn gives 2.48 hours.
1+2.48 = 3.48 hrs @ 380ktas equals
1322nm range nil wind with no variable reserve.
This is somewhat less than the reported 1600nm sector.
First off, nice illustration of a fuel planning approach.
Now just to play devil's advocate: if forecast winds aloft are 70-90 knots tail wind component at planned FL, you can see how someone might talk themselves into figuring that they can make it.
I prefer your approach, however.
Later Edit: I did a little poking about at some met sites, and from what I found, a tail wind approaching that value was not available for that night's flight. Maybe that was a bad example of how one might talk one's self into making this a one leg flight.