Fuel requirements
107. In general, a gas turbine fuel should have the following qualities:
(1) Be 'pumpable' and flow easily under all operating conditions.
(2) Permit engine starting at all ground conditions and give satisfactory flight relighting characteristics.
(3) Give efficient combustion at all conditions.
(4) Have as high a calorific value as possible.
(5) Produce minimal harmful effects on the combustion system or the turbine blades.
(6) Produce minimal corrosive effects on the fuel system components.
(7) Provide adequate lubrication for the moving parts of the fuel system.
(8) Reduce fire hazards to a minimum.
108. The pumping qualities of the fuel depend upon its viscosity or thickness, which is related to fuel temperature, Fuel must be satisfactory down to approximately -50 deg. C. As the fuel temperature falls, ice crystals may form to cause blockage of the fuel filter or the orifices in the fuel system. Fuel heating and anti-icing additives are available to alleviate this problem.
