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A330/A340 FLEET SI-030 P 8/8
FCTM 17 JUN 09
A330/A340 FLIGHT CREW TRAINING MANUAL
SUPPLEMENTARY INFORMATION
ZFW- ZFCG ENTRY ERRORS
A330/A340 FLEET SI-040 P 1/4
FCTM 17 JUN 09
GENERAL
Applicable to: ALL
Before engine start, the FMGC computes the aircraft’s Gross Weight (GW) and Center of Gravity
(CG). After engine start, both the Flight Envelope Computer (FE) and the Fuel Control and
Monitoring Computer (FCMC) calculate the GW and CG.
These GW and CG values provide information for:
• Aircraft GW and CG displays
• FM predictions and speeds
• The AP/FD and flight control laws
• The calculation of the VS1G
• The calculation of the characteristic speeds (VLS, F, S, GD), for display on the PFD
• CG control
If a ZFW or ZFWCG is not correctly entered on the INIT B page of the MCDU, this results in
calculation errors.
TECHNICAL BACKGROUND
Applicable to: ALL
To calculate the GW and CG:
1. The pilot enters the ZFW and ZFWCG on the INIT B page of the MCDU.
2. The FCMC calculates the GW and CG by taking into account the ZFW and ZFWCG (entered on
the INIT B page of the MCDU), and the quantity of fuel in each tank.
The GW and CG, calculated by the FCMC, are:
• Used by the FCMC to regulate the center of gravity
• Transmitted to the ECAM SD for display
• Transmitted to the FE.
3. The FE transmits the GW and CG to the:
• FM, for predictions and speeds
• PRIM, for the computation of the VS1G and for flight control laws
• FG, for the AP/FD control laws
• EIS, for the display of characteristic speeds
A330/A340 FLIGHT CREW TRAINING MANUAL
SUPPLEMENTARY INFORMATION
ZFW- ZFCG ENTRY ERRORS
A330/A340 FLEET SI-040 P 2/4
FCTM 17 JUN 09
Note: • The FE computes a backup:
GW, with aerodynamic ‐ data or from Fuel Used (FU) data
‐ CG, with aerodynamic data, and the THS position.
If FCMC data are available, the GW and CG FCMC computed are used.
If FCMC data are not available, the GW and CG FE computed are used.
However, if the FCMC-computed CG, and the FE-computed CG differs more than a
specified threshold, the PRIM uses 30 % CG for flight control laws.
• The FE uses VS1G from the PRIM to compute characteristic speeds (VLS , F, S, GD).
These speeds are displayed on PFD.
• For the calculation of ValphaPROT, ValphaMAX, and VSW, the PRIM uses AOA data
only.
4. The FE-computed CG is used to trigger the Excess AFT CG warnings of the FWC. This works
independently from the FCMC.
GW and CG computation and use
ENTRY ERROR AND OPERATIONAL CONSEQUENCES
Applicable to: ALL
The following summarizes the impact of erroneous ZFW or ZFWCG entries on the INIT B page of the
MCDU:
ERRONEOUS ZFWCG ENTRY
If the ZFWCG entry is not correct, the FCMC-computed CG will not be correct, and:
• An erroneous CG appears on both the SD page of the ECAM, and on the FUEL PRED page of
the MCDU.
• Affects CG regulation.
However, the EXCESS AFT CG warning remains reliable.
A330/A340 FLIGHT CREW TRAINING MANUAL
SUPPLEMENTARY INFORMATION
ZFW- ZFCG ENTRY ERRORS
A330/A340 FLEET SI-040 P 3/4
FCTM 17 JUN 09
• Slightly affects FM predictions.
• Impacts the VLS and VAPP speeds, that appear on the PERF APPR page of the MCDU
(A340-500/600 only).
• The pitch trim setting may not be correct at takeoff.
• The PRIM operates with a CG of 30 % in flight.
However, this will have a very small effect on aircraft handling.
• Slightly affects AP/FD control laws.
• Impacts the VLS that appears on the PFD (A340-500/600 only).
However, ValphaPROT, ValphaMAX, VSW are not affected, because they are calculated on the
basis of aerodynamic data.
ERRONEOUS ZFW ENTRY
If the ZFW entry is not correct, the FCMC-computed GW and, to a lesser degree, the CG will not
be correct, and:
• Erroneous GW and CG appear on both the ECAM and on the FUEL PRED page of the MCDU.
• Slightly affects CG regulation, because the aft CG target depends on the weight. However the
EXCESS AFT CG warning remains reliable.
• May affect the SRS guidance mode (If VLS is greater than the V2 that is entered on the PERF
TO page of the MCDU).
• Affects FM predictions and speeds.
• Slightly affects FG and the PRIM control laws
• Affects the characteristic speeds that appear on the PFD.
However, ValphaPROT, ValphaMAX, VSW are not affected, because they are calculated on the
basis of aerodynamic data.
ERRONEOUS FUEL ON BOARD (FOB) ENTRY
　
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