Make it a habit to give the engine and engine compartment a visual inspection before starting the engine and after operation once the engine has stopped. This will help you to discover quickly if anything abnormal has happened, or is about to happen.
The fan plot only applies to a given air temperature, normally 20 °C (68 °F), which gives an air density of 1.2 kg/m3 (0.075 lb/ft.3). If the plot is not drawn for 20 °C the actual temperature and density must be specified. The pressure from the fan plot must be recalculated for other temperatures. If the fan graph applies to an air density of ρ0 and the actual air density is ρ1, the pressure ρ0 from the graph is recalculated as follows:
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