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summarized in the table.
When the selected autothrust function is active
(according to the thrust lever position), the master
FMGC controls the engines, via the FCU.
Consequently, in automatic control, it is the same
FMGC which controls the engines and the flight
controls.
To recover the A/THR function, when one AP (AP1 or
AP2) is engaged and its own A/THR has failed, the
opposite AP should be engaged to switch from the master
FMGC to the other (which now becomes the master) and
to switch to the opposite A/THR.
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TMUFGCI04-P04 LEVEL 1
FLIGHT GUIDANCE PRIORITY LOGIC - AUTOTHRUST (A/THR)
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FLIGHT GUIDANCE PRIORITY LOGIC
FLIGHT MODE ANNUNCIATOR (FMA)
The three types of information on the Flight Mode
Annunciator (FMA) are:
- Autothrust mode/status,
- Autopilot/Flight Director mode and status,
- Flight Management messages.
The autothrust information is displayed by the master
FMGC which supplies both FMAs.
The autopilot/Flight Director information is displayed
according to the following logic:
- With at least one AP, the master FMGC supplies
both FMAs.
- Without AP, with the FDs engaged, FMGC1
supplies FMA1, FMGC2 supplies FMA2.
- Without AP, with one FD failed or manually
disengaged, the opposite FMGC supplies both
FMAs.
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TMUFGCI04-P05 LEVEL 1
FLIGHT GUIDANCE PRIORITY LOGIC - FLIGHT MODE ANNUNCIATOR (FMA)
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SELF EXAMINATION
Which is the master FMGC with no FD engaged and AP2
engaged?
A - FMGC1.
B - FMGC2.
C - Either FMGC 1 or FMGC 2, independently
of AP, FD and A/THR engagement status.
AP1 is engaged, FDs are engaged, A/THR1 is engaged.
How do the FMGCs work in normal conditions?
A - Each FMGC drives its own FD symbols,
FMGC1 supplies both FMAs and controls
the flight controls and engines.
B - FMGC1 drives FD symbols on both PFDs,
supplies both FMAs and controls the
flight controls and engines.
C - FMGC1 drives FD symbols on the Captain
PFD, supplies FMA on Captain PFD and
controls the flight controls. FMGC2
controls the engines.
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22 - AUTO FLIGHT SYSTEM
22-81-00 FLIGHT CONTROL UNIT
DESCRIPTION/OPERATION
CONTENTS:
General
Display
Speed/Mach Reference Control Knob
Speed/Mach Switching
Heading/Track Lateral Control Knob
Altitude Selector Knob
Metric Altitude Pushbutton
Vertical Speed/Flight Path Angle Control Knob
Heading-V/S/Track-FPA Switching Pushbutton
Autopilot 1 & 2 Engagement Pushbuttons
Autothrust Engagement Pushbutton
Expedite Engagement Pushbutton
Approach Engagement Pushbutton
Localizer Engagement Pushbutton
Self Examination
TMUFM2004 LEVEL 3
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FLIGHT CONTROL UNIT DESCRIPTION/OPERATION
GENERAL
This description only deals with the central part of
the Flight Control Unit (FCU).
In general, the FCU provides the short term interface
between the crew and the Flight Management and Guidance
System.
The FCU is the main interface to engage functions and
guidance modes and to select parameters.
NOTE: In fact, there is one FCU PANEL which controls
two identical processing channels: FCU 1 and FCU
2.
Only one channel is active at a time, the other
is in standby. If both channels fail, all FCU
controls are inoperative: AUTOTHRUST, AP/FD 1
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