According to my KDR I'm guessing I got it wrong.
The usable fuel on board is 68 gallons and the flight time is 160 minutes with a fuel flow of 12gph
What is the Margin fuel available at destination if fixed reserves remain intact. (Use Fuel Flow to work out Fixed Reserve of 45 mins)
. I then worked out the Fixed Reserve to be 9 gallons and got 45 gallons for margin at destination (Added 9 to 36) . I obviously did something wrong, I probably over complicated things.
use cruise fuel flow to work out fixed reserve for 45 mins
A PVT flight takes off with 65 gallons of useable fuel.
For a planned flight time of 2 hours and 40 minutes at a fuel consumption rate of 14 gph, the margin of fuel available at the destination assuming the 45 minute fixed reserve remains intact is -