ED Decision 2003/18/RM
(a) Main pump. For the main pump, the following applies:
For an engine installation having fuel pumps to supply fuel to the engine, at least one pump must be directly driven by the engine and must meet CS-VLA 955. This pump is a main pump.
(b) Emergency pump. There must be an emergency pump immediately available to supply fuel to the engine if the main pump (other than a fuel injection pump approved as part of an engine) fails. The power supply for the emergency pump must be independent of the power supply for the main pump.
(c) Warning means. if both the main pump and emergency pump operate continuously, there must be a means to indicate to the pilot a malfunction of either pump.
(d) Operation of any fuel pump may not affect engine operation so as to create a hazard, regardless of the engine power or the functional status of any other fuel pump.
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