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   Predicted targets are computed by the FMGS.
- Selected Guidance : The aircraft is guided to the selected target, modified by the pilot.
Targets are selected on the flight control unit located on the pilot's glareshield. The
decision to engage a "selected" or "managed" guidance is always under the control of
the pilot.
Selected guidance has priority over managed guidance.
CCM ALL
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┃                                ┃                          ┃1.22.10     P 2       ┃
┃                                ┃                          ┣━━━━━┳━━━━━┫
┃I  -~ A318                      ┃l          AUTO FGENERAL  ┃SEQ 001 1 ┃I REV 32  ┃
┃  .,,,.8, ,, ~e~ A319           ┃                          ┃          ┃          ┃
┃ Lli,~ A320                     ┃                          ┃          ┃          ┃
┃      A~7-~'M" A321             ┃                          ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                          ┃          ┃          ┃
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FLIGHT MANAGEMENT GUIDANCE COMPUTER (FMGC)
Each FMGC is divided into two main parts.
- The Flight Management (FM) part controls the following functions :
   ~ Navigation and management of navigation radios.
   ~ Management of flight planning.
   ~ Prediction and optimization of performance.
   ~ Management of displays.
- The Flight Guidance (FG) part performs the following functions :
   ~ Autopilot (AP) command
   ~ Flight director (FD) command
   ~ Autothrust (A/-FHR) command
Each FMGC has its own database (190 Kwords or 400 Kwords, depending upon the FMGS
standard), and each is comprised of two fields.
- One field, which the pilot cannot modify, contains customized and standard navigation
   data : Navaids, waypoints, airways, enroute information, holding patterns, airports,
   runways, procedures (SIDs, STARs, etc.), company routes, fuel policy, alternates.
   The airline updates this part every 28 days, and is responsible for defining, acquiring,
   updating, loading, and using this data.
   The data goes into each FMGC separately, although it can be copied from one FMGC to
   the other, if the system has the optional crossload function. This updating operation
   takes about 20 minutes.
- The second field contains pilot-stored elements that enable the pilot to create 20
   waypoints, 10 runways, 20 navaids, and 3 routes.
Note : When the two FMGCs are not working with the same database, the FMGS operates
       in independent mode. (See FMGS MODES OF OPERATION).
Each FMGC also contains an integrated performance database, used by the FM part, for
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual1(139)