Only then these pumps are switched ON, until they are again indicated on EICAS, you will switch them of because they are emptied. If the horizontal stabilizer also contains fuel at take-off, this fuel will be pumped to the CWT in level flight, when indicated on EICAS (eg >FUEL PUMP STAB L/R). This means that every main tank is feeding its respective engine. The OVRD pumps are switched OFF, and crossfeed 1&4 closed. This continues until main 1&4 are approx the same value as main 2&3 (so EICAS >FUEL TANK/ENG is displayed).Then the third mode kicks in. The second mode operates the OVRD pumps (which have a larger output power then the main pumps) and feeds all engines, and all crossfeed valves are open ("in-line"). After the EICAS alert >FUEL LO CTR L/R, the center tank pumps are switched off, since fuel quantity in the CWT is low. A second predetermined amount to which intelligent crossfeed valve 116 may be open may be when shaft 504 is positioned between position X 4 and X 6 and/or between position X 5 and X 7. Next, check for correctness the path to the aircraft. Likewise, between position X5 and X7, intelligent crossfeed valve 116 may allow more fuel to flow than between position X3 and X5 but not a maximum amount of flow. I planned to do this review with X-Plane 11.00, but that’s not yet in the X-Plane 11 list, but within the X-Plane 10 it is, so I go for that one and seek Rotate MD-80. After flap retraction, all angines are fed from the CWT. You’ll find on the left icons for X-Plane 10 and X-Plane 11. This occurs before T/O with the trailing edge flaps extended. The crossfeed valves are controlled automatically (so crossfeed 2&3 close automatic, so all crossfeed valves ON/IN-LINE and the CWT pumps ON). In the first one, main 2&3 feed their respective engines, and the CWT feeds engines 1&4. And last but not least the tank to engine configuration. Then the mode with no CWT fuel and main 2&3 > main 1&4.
#CROSSFEED VALVES X PLANE 11 FULL#
The 747 has three "modes" of fuel operation: all main tanks full and with CWT (center wing teank) fuel (and, if installed, fuel in the horizontal stabilizer).