CAP 697 section 4 page 68
a 3 step method:
1. calculate
TAS
2. calculate
leg distance in NAM (use formula)
3. back
to table enter at START MASS, calculate END MASS difference is FUEL
required
1. TAS 406kts, ISA +20ēC,
Note 2 (C) +20kts, 426kts
2. NAM = NGM x (TAS/GS) =
540 x (426/376) = 612 NAM
3. START MASS 60000kg
.
Range 3898 NAM
. Subtract 612 NAM = 3286NAM
Back to the table look
for 3286 (3284 close enough)
corresponds to mass 52800kg (END MASS)
(START MASS END MASS) =
FUEL REQUIRED = 60000 52800 = 4200kg
Lastly, small correction
(Note 2 A), +1%, +42kg, 4242kg