Don Terrill’s Speed-Talk

As engine load goes up the fuel level in the main well lowers and exposes a bleed hole. As engine load increases even more the fuel level in the main well lowers even more and exposes another bleed hole. This is how the fuel curve is ''trimmed'' to make it as linear as possible. Is this true?

BigBlocksOnTop wrote:As engine load goes up the fuel level in the main well lowers and exposes a bleed hole. As engine load increases even more the fuel level in the main well lowers even more and exposes another bleed hole. This is how the fuel curve is ''trimmed'' to make it as linear as possible. Is this true?

KINDA ... air is always being brought through those holes; just sometimes BELOW the fuel level. It is just not as simple a process as you think.
The bleeds change the pullover weight of the fuel by adding air as well as reduce the amount of draw, as the dropping fuel level exposes another hole.