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┃      A~7-~'M" A321             ┃FLIGHT MANAGEMENT ┃SEQ 001 ┃REV 27  ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                  ┃        ┃        ┃
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The performance function includes optimization and predictions
OPTIMIZATION
The FMGC minimizes cost by optimizing speed. The optimization function computes the
following items :
- takeoff, approach, and go-around speeds (F, S, Green Dot, VAPP)
- an optimum target speed for CLB and DES phases (ECON CLB/DES SPD)
- an optimum target Mach number for CRZ phase (CRZ MACH)
- an optimum FL, for information purposes
- an optimum descent profile from CRZ FL down to the destination airport.
These items depend on the data the pilot inserts during lateral and vertical flight planning
and revision procedures.
Most are displayed on the PERF pages associated with the appropriate flight phases.
Takeoff, approach and go around speeds
The FMGC computes takeoff speeds (F, S, Green Dot) during the preflight and takeoff
phases, using the performance model in the database and the takeoff weight.
The pilot has to insert V1, VR, and V2 in the PERF TO page manually.
The FMGC uses the performance model and either the predicted landing weight or the
current gross weight at transition to the approach phase to compute approach speeds
(VLS, VAPP, F, S, Green Dot). On the PERF APPR page, the selected LDG CONF determines
the applicable VLS and VAPP, the latter being updated by the WIND correction that the pilot
enters on the same page.
The FMGC uses the performance model and gross weight to compute go-around speeds
(F, S, Green Dot).
bEST          APPR
  QNH     FLP RETR   FINAL
1015          F=187     VOR33R
  TEMP    SLT RETR  MDA
[  ]o          S=230          640
MAG WIND     CLEAN
[ ]~/[ ]  0=267
TRANS ALT       LDG CONF
4000                     CONF3
  VAPP       VLS
145             135        FULL
  PREV               NEXT
<PHASE                   PHASE>
PERF APPROACH PAGE
CCM ALL
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┃                                ┃                            ┃1.22.20     P 22      ┃
┃                                ┃                            ┣━━━━━┳━━━━━┫
┃I  -2 A318                      ┃I         FLIGHTFMANAGEMENT ┃SEQ 001 1 ┃I REV 29  ┃
┃  .-,,.8, ,, ~e~ A319           ┃                            ┃          ┃          ┃
┃ Lli,~ A320                     ┃                            ┃          ┃          ┃
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(7)