Bladecrack wrong I'm afraid, the Amber warning doesn't trigger because the supplies show permanent full
JT - I have not seen this described, do you have a reference?
Falcon900
I may yet be missing something, but they clearly are concerned with quantity readings and the amber warnings. I know that the red warnings are separate
I agree with you about the amber FUEL caution fault, but can you explain your reference for a defective fuel contents gauge?
To summarise, there will always be fuel in the tank which cannot be accessed by the supply tanks and hence the engines. The quantity varies depending on aircraft attitude, and can be increased by incorrect transfer pump settings or pump/valve failures.
I am aware, and all EC135 pilots are trained how to manage it.