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The recommended technique is to carry out a FMS update over a beacon by pressing the UPDATE prompt once estimating that the aircraft overflies the beacon using the associated needle. The potential error induced is approximately 4 to 5 nm. When the position update is achieved, the EPE is automatically set to a higher value and the navigation accuracy is low.
The second technique consists in updating the FM position when flying over a Point/Bearing/
Distance (P/B/D) with reference to beacon raw data (Needle + Distance) rather than the beacon itself. The potential for error is far less when the distance is greater than 60 nm. The flight crew will keep in mind the potential 180 ° error on bearing.
 

  SUPPLEMENTARY INFORMATION
NAVIGATION ACCURACY
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

FM position update in flight
 
 

  SUPPLEMENTARY INFORMATION
NAVIGATION ACCURACY
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

Intentionally left blank
 

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

GENERAL
Applicable to: ALL
The aircraft Gross Weight (GW) and Centre of Gravity (CG) are computed independently by the FM and FAC:
GW and CG values FM computed are used for:
? FM predictions and speeds
? ECAM (GW)
? MCDU (GW and CG)
GW and CG values FAC computed are used for:
? Flight control laws
? Computation of characteristic speeds (VLS, F, S, GD) for display on PFD
A ZFW or ZFWCG entry error in MCDU INIT B page induces calculation errors that are to be highlighted.
TECHNICAL BACKGROUND
Applicable to: ALL
The GW and CG computation is as follows:
1. The pilot enters the ZFW and ZFWCG in the MCDU INIT B page
2. The FMGC computes the GW and CG from:
? The ZFW, ZFWCG inserted in the MCDU INIT B page
? The fuel quantities from the Fuel Quantity Indicator (FQI)
? The Fuel Flow from the FADEC.
3. This current GW and/or CG is used for:
? FM predictions and speeds
? ECAM (GW only)
? MCDU (GW and CG)
4. The FAC computes its own GW and CG from aerodynamic data.
5. GW and CG FAC computed are used for:
? Minor adjustments on the flight control laws
? Characteristic speeds (VLS, F, S, Green dot) display on PFD.
 

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

 
Note: 1. On ground, FAC uses the GW FM computed.
2. In flight, at low altitude (below 15 000 ft), low speed (below 250 kt) and flight parameters stabilized, GW FAC computed comes from aerodynamic data. If these conditions are not met, GW FAC computed equates to the last memorized GW - fuel used.
　
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本文鏈接地址：A318/A319/A320/A321 機組訓練手冊 FCTM Flight Crew Training Manual(177)