FE WEIGHT COMPUTATION (BACKUP)
‐ When the aircraft is below 14 625 ft, and 255 kt :
GW = f(α, CAS, N1/EPR actual, CG from FE part, altitude)
‐ When the aircraft is above 14 625 ft, or 255 kt :
GW = TOGW – WFU
TOGW : Takeoff Gross Weight
WFU : Weight Fuel Used, acquired from the FADECs.
FE CENTER OF GRAVITY COMPUTATION (BACKUP/AFT CG WARNING)
The CG is computed from the position of the horizontal stabilizer, and is function of the N1/EPR,
Vc, ALT, MACH and GW from FE part.
I don't understand how each thing, GW and CG, use each other for computation. GW uses FE CG and CG uses FE GW. How can that be???