Treat as one leg –

ARD to BULEN,

243nm,

Track 123º (or 124º - it won’t make any difference to the answer!)

Fuel used ARD-BULEN = (869 – 432) = 437 litres

Wiz wheel ….. GS OUT = 202kts         GS HOME = 135kts

Calculate fuel flow outbound:

Leg time = (distance/GS) = 243 / 202 = 1.203 hours

Fuel flow = Fuel used / Time = 437 / 1.203 = 363 litres/hour

Calculate fuel used BULEN – ARD

Leg time = (distance/GS) = 243 / 135 = 1.800 hours

Fuel used = fuel flow x time = 363 x 1.800 = 653 litres

Total fuel consumption = 869 + 20 + 653 = 1542 litres