Three problems .... TAS, NAM calculation, 0.6% correction .... to help, don't use figure 4.5.2 to find NAM ... use the formula:

NAM = NGM x (TAS/GS)

So .... the answer

CAP 697 Section4 page 32

1. TAS 431 kt temp is ISA +12° so +12 kts TAS 443kts

2. NAM = NGM x (TAS/GS) = 3200 x (443/493) = 2875 NAM

3. Start mass = 55 000kg ... from table Range = 4151 NAM ... subtract NAM range ... 4151 - 2875 = 1276 NAM

Back to table, look for 1276 NAM ... 40 600 kg ....this is END MASS

Start mass - End mass = 55 000 - 40 600 = 14 400 kg (Fuel required)

Last correction for temp, ISA +12, +0.7%, 14 400 x 0.7% = +100kg ....Fuel 14 500kg

NB>>>>For most examples we would advise using the formula, as Fig 4.5.2 is a nightmare