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3. If the GW FM computed and FAC computed differs from a given threshold, a "CHECK GW" message appears on the MCDU scratchpad.
ZFW ENTRY ERROR AND OPERATIONAL CONSEQUENCES
Applicable to: ALL
If the pilot enters erroneous ZFW on MCDU INIT B page, this will affect as follows:
GW and, to a lesser degree, CG, computed by FM are erroneous. This induces the following consequences:
? The FM predictions and speeds are erroneous
? Incorrect GW and CG on MCDU FUEL PRED page
? Incorrect GW displayed on ECAM
FAC GW, which is based on FM GW on ground, will be updated only once airborne through a specific slow calculation using AOA information. Consequently,
? Characteristic speeds on PFD at take-off are erroneous, but they are correct in flight
? SRS mode guidance is affected if computed VLS is above V2 as inserted in the MCDU PERF TAKE-OFF page.
 

  SUPPLEMENTARY INFORMATION
ZFW - ZFCG ENTRY ERRORSZFW - ZFCG ENTRY ERRORS
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

Note: 1. In flight, if the FM and FAC GW differ from a given threshold, a "CHECK GW" message is triggered on the MCDU.
2. Valpha prot, Valpha max, Vsw are not affected since based on aerodynamic data.
ERRONEOUS FUEL ON BOARD ENTRY
As long as the engines are not started, the FM GW is erroneous and above-mentioned consequences apply. Once the engines are started, the fuel figures are updated and downstream data update accordingly.
It should be noted however, that the FOB on ECAM is correct since it is provided from FQI data.
OPERATIONAL RECOMMENDATIONS
Applicable to: ALL
ZFW entries should be cross-checked by both crew members to avoid entry error.
If the "CHECK GW" amber warning is displayed on the MCDU, a significant discrepancy exists between the FM computed GW and the FAC computed GW.
The crew will compare the Load and Trim Sheet (LTS) figures with the FM GW and fuel used:
? If an obvious entry error is detected, FM GW will be updated on the MCDU FUEL PRED page.
? If FM and LTS GW are in accordance and appear to be correct, the FAC computed GW should be suspected. (AOA sensor problem). Consequently, characteristic speeds on PFD are erroneous and should be disregarded. Characteristic speeds should be extracted from QRH.
? If FM and LTS GW are in accordance but LTS GW is suspected, FAC and QRH characteristic
speeds should be compared (to validate FAC outputs) and the most appropriate applied.
 

  SUPPLEMENTARY INFORMATION
ZFW - ZFCG ENTRY ERRORSZFW - ZFCG ENTRY ERRORS
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

Intentionally left blank
 

  SUPPLEMENTARY INFORMATION
TCAS
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

TECHNICAL BACKGROUND
　
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