Fuel system
A333 in our fleet does not have a centre tank but the -200 does.
So then once settled in the climb/cruise fuel is transferred to the trim tank for C of G purposes.
Centre if avail is used then inner tank 1 and 2.
Trim tank moves fuel fwd incrementally to tanks 1 and 2 as C of G moves.
Outer tanks move fuel to inner tanks 1 and 2 when any inner reaches 3500kg incrementally.
Approx 35 mins to touchdown all remainder, if any left in trim tank, is moved fwd.
Now using inner 1 and 2 only.
TW
PS Someone will now be exacting but this is good for student level.