Everyone, we have updated the manual in which regards to the fuel system transfer explaining how the fuel system work when the trim transfer valves and pumps are at auto. This is the extract:
Fuel auto transfer:
For the correct operation of the fuel auto transfer it is required:
- Inlet and Override valves 5, 7, 9, 11 set at Auto (middle position).
- Pumps 9, 10, 11 (remember tank 11 has 4 pumps) set at Auto (middle position).
Normal Mode (Fuel auto transfer OFF by default)
If nothing is specified in the Rotary selectors or the quantities specified in the selectors are below the current quantities: The fuel will be transferred to valves 5 and 7 in the normal discharge order, first emptying from tank 9, followed by 10 and finally from 11 (always in that order since the priority is always to maintain a CG aft). If load limits have been specified in the selectors, once the current quantities of tanks 9, 10 and 11 coincide with their load limits, all valves (5,7,9 and 11) will close maintaining those limits. If a value of 0 was set on any of the selectors, the tanks attached to their selectors will empty their entire tanks (Remember that rotary selector 9 is the combined amount of fuel from tanks 9 and 10).
Forward Mode:
An fwd. transfer process will be initiated, according to the load limit specified in the rotary selector 9: When the combined amount of fuel from tank 9 and tank 10 matches the load limiter set in the selector or the amount of current fuel is higher than the load limit specified, its valves will close and fuel will continue to be transferred through valves 5 and 7. When tank 11 match its load limit, its pumps, as well as valves 5 and 7, will be closed, ending the transfer.
Rearward Mode:
An aft transfer process will be initiated, according to the amount specified in the rotary selector 11: When tank 11 reaches the load limit specified in the selector or the amount of fuel is higher than the load limit specified, its valves will close and fuel will continue to be transferred through valves 5 and 7. When tank 9 matches it load limit, its pumps, as well as valves 5 and 7, will be closed, ending the transfer.
Fuel Fwd transfer switch Override (Overhead switch):
It will ignore the load limit quantities specified in the selectors, and will simply start a fwd transfer process from tank 11 to tank 9. If tank 9 has reached its limit (tank 10 is not taken into account), fuel will continue to be transferred through valves 5 and 7.
Tanks 1-4 switch:
If it is activated it will try to maintain an amount of fuel of 40% for tanks 1-4, in order to favor a CG aft.