The flight management system is available when the aircraft electrical network is energized. The FMGCs work normally in dual mode on the master/slave concept. Both FMGCs perform the same functions simultaneously and use all crew inputs on MCDU 1 or 2. The flight management functions are performed by using normally the system input of the associated side (1 or 2). The slave system synchronizes on the master system for the initialization of flight planning or for the modification and sequencing or for the performance modes or for the guidance modes or for the radio navigation. The results are compared and, in case of discrepancy, the MCDU displays messages (position, weight, target speeds). If dual mode cannot be maintained (incompatible data base...), both FMGCs revert to independent mode, i.e. each FMGC controls the MCDU of its own side. No information is transferred from one FMGC to the other and therefore neither synchronization nor comparison can be performed. In case of FMGC failure, the opposite FMGC takes control of MCDU 1 and 2 independently and feeds both NDs with the same data. All the functions of the flight management are available through MCDU 1 or 2.
AFS - FD Symbols on the PFD Figure 007
1EFF : 1 1R 1CES ALL 1 11 1 22-00-00 Page 19 Feb 01/99
(2) Autopilot (AP)
(a) Autopilot modes The autopilot performs the modes given below:
-cruise modes: | Vertical Speed (V/S) | Flight Path Angle (FPA) | Altitude Hold (ALT)
Longitudinal | Altitude Acquire (ALT*) | Open Climb (OP CLB) | Climb (CLB) | Open Descent (OP DES) | Descent (DES) | Expedite (EXP)
| Heading (HDG)
Lateral | Track (TRK)
| Lateral Navigation (NAV)
-Takeoff/Go Around/Approach modes:
-------------------------------------------------------------------------------| MODES | PITCH AXIS | ROLL AXIS | |---------------------|----------------------------------|--------------------| | | 2 engines | 1 engine fail | Runway (RWY) : | | | operational | | holding of LOC | | |----------------|-----------------| center line up to | | TAKEOFF | Speed Reference| SRS : holding of| 30 ft. and TRACK | | (TO) | System (SRS) : | Va if Va > V2 | after 30 ft. (not | | | holding of | V2 if Va < V2 | available on ground| | | V2 + 10 kt | (*) | for AP) | |---------------------|----------------------------------|--------------------| | GO AROUND | SRS : holding of Va if Va > VAPP | Track | | (GA) | VAPP if Va < VAPP (*) | | |---------------------|----------------------------------|--------------------| | LOCALIZER (LOC) | | LOC capture & track| |---------------------|----------------------------------|--------------------| | | ILS | Glide capture and track (G/S) | LOC capture & track| | APPROACH | approach | | Align and roll out | |(depending|----------|----------------------------------|--------------------| | on pilot | non-| Final descent (FINAL) | Approach NAV | |selection)| precision| | | | | approach | | | -------------------------------------------------------------------------------(*) Va : Aircraft speed when the engine failure occurs
(b) Operational use
1 Engagement of system and selection of modes
_ The FCU enables the engagement of the AP and the selection of modes through three control panels:
-
the left and right side panels for the selection of modes on Capt PFD, ND and on F/O PFD, ND respectively
-
the center panel for the engagement of AP and A/THR and the
selection of the AP/FD modes. The FCU also enables the selection of reference parameters:
-heading/track
-vertical speed/flight path angle
-speed/Mach
-altitude.
The operating mode of the AP is in MANUAL CONTROL when the
references are selected on the FCU. The AP is in AUTO CONTROL
when the flight management system defines these references.
The table below defines the modes which are available in
manual and auto controls.
------------------------------------------------
| AUTO CONTROL | MANUAL CONTROL | ------------------|----------------------|-----------------------| | | RWY | | | LATERAL | NAV | HDG/TRK | | | LOC | | | | TRK (GA) | | |-----------------|----------------------|-----------------------| | | SRS (TO/GA) | ALT (AUTO ARMED) | | VERTICAL PATH | PROFILE | VS/FPA | | | . CLB | EXP (SPEED AUTO | | | . ALT CNST | CONTROL) | | | . DES | OP CLB | | | | OP DES | |-----------------|-- -------------------|-----------------------| | SPEED | FLT PLN REFERENCE | FCU REFERENCE | |-----------------|----------------------|-----------------------| | APPROACH | APPR RNAV/ADF/VOR | | | | LAND LOC/GLIDE/FLARE/| | | | ALIGN/ROLLOUT/ | | | | RETARD | | ------------------------------------------------------------------ In auto control:
-the corresponding reference is shown by a dashed line on the FCU (for altitude, a value is always shown).
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