Refer to CAP 697 Section 2 page 6 ...
Question conditions, 8000ft, OAT +
13º C
8000ft, ISA is -1ºC, so temperature
condition is 'ISA +14ºC'
We need to interpolate between ISA
and ISA +20ºC
From the table, 8000ft:
ISA ...... Fuel flow 71.1PPH, Man Press 22.4
ISA+20º. Fuel flow 68.5PPH, Man Press 22.4
Interpolating ... (71.1-68.5)x(14/20) = 1.82
So fuel flow = 71.1 - 1.82 = 69.28
PPH
Also, refer to CAP 697 Section 2 page
1 .... fuel density 6 lb per
US gallon (unless otherwise specified)