| 摘要 |
A fuel system is provided with two filters between the L.P. pump and the H.P. pump, both of which are used (in parallel) when the temperature of the L.P. fuel is above 0 DEG C. When the temperature of the fuel drops below 0 DEG C., all the L.P. fuel is passed through the first filter, and a small supply of warm H.P. fuel is passed through the second filter. Ice collects in the first filter until a predetermined pressure drop across it causes all the L.P. fuel flow to be switched to the second filter. The first filter is then de-iced by a small supply of warm H.P. fuel. This cycle is repeated continuously while the temperature of the L.P. fuel is below 0 DEG C.
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