CAP 697 FIG 3.1

Enter chart the first time at TOC OAT (FL110, ISA=-7ºC, so ISA -10ºC = -17ºC),

Then enter a second time to correct for Airfield elevation (OAT -1ºC)

Base scale left side -17ºC, vertically up to 11000ft, across to the fuel line, read the scale = 9.5 US gall

Base scale left side -1ºC, vertically up to 3000ft, across to the fuel line, read the scale = 3 US gall

Fuel for climb Airfield (3000ft) to 11000ft = (9.5 - 3) = 6.5 US gall