-stabilization of the aircraft around its center of gravity when the AP/FD system holds vertical speed or flight path angle and heading or track
-acquisition and hold of a flight path
-guidance of the aircraft at takeoff by holding runway axis and speed (available in the FD as long as the aircraft is on ground)
-automatic landing and go around.
The autopilot gives orders to control:
-
the position of the control surfaces on the three axes: pitch, roll and yaw
-
the position of the nose wheel.
These orders are taken into account by these computers:
FACs, ELACs, SECs and BSCU.
The flight director generates guidance orders used in manual control.
These orders are displayed on the Primary Flight Displays (PFD) through the
Display Management Computers (DMC).
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Layout of AP/FD and Flight Control Components
Figure 001
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2. Component Location__________________ (Ref. Fig. 002, 003)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------1CA1 FMGC-1 83VU 127 824 22-83-34 1CA2 FMGC-2 84VU 128 824 22-83-34 2CA FCU 13VU 211 831 22-81-12 3CA1 MCDU-1 11VU 211 831 22-82-12 3CA2 MCDU-2 11VU 211 831 22-82-12 12CA1 SOLENOID-PITCH & ROLL LOCK, CAPT 193VU 211 831 22-11-00 12CA2 SOLENOID-PITCH & ROLL LOCK, F/O 182VU 212 831 22-11-00 15CA1 RELAY-RUDDER ARTF FEEL 1 187VU 127 824 22-31-00 15CA2 RELAY-RUDDER ARTF FEEL 2 187VU 127 824 22-31-00 16CA SOLENOID-RUDDER ARTF FEEL 325 325AL 27-23-17 21CA RELAY-STICK LOCK 1/CAPT 187VU 127 824 22-31-00 22CA RELAY-STICK LOCK 2/CAPT 187VU 127 824 22-31-00 23CA RELAY-STICK LOCK 1/F/O 187VU 127 824 22-31-00 24CA RELAY-STICK LOCK 2/F/O 187VU 127 824 22-31-00 1CC1 FAC-1 83VU 127 824 22-66-34 1CC2 FAC-2 84VU 128 824 22-66-34 2CE1 ELAC-1 83VU 127 824 27-93-34 2CE2 ELAC-2 84VU 128 824 27-93-34 1CE1 SEC-1 83VU 127 824 27-94-34 1CE2 SEC-2 84VU 128 824 27-94-34 1CE3 SEC-3 93VU 121 811 27-94-34 8CE1 P/BSW-TAKEOVER & PRIORITY, CAPT 191VU 211 831 27-92-00 8CE2 P/BSW-TAKEOVER & PRIORITY, F/O 180VU 212 831 27-92-00 10GG BSCU 94VU 122 811 32-42-34
3. System Description__________________
A. Control and Indicating
(Ref. Fig. 004)
(1) Controls
(a) Flight Control Unit (FCU) This unit transmits the modes and the references selected by the pilots to the FMGCs. It also enables the selection of the displays on the EFIS display units and the display of the standard baro value for the ADIRUs.
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Location of FCU and MCDUs
Figure 002
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INTENTIONALLY BLANK
R 1 1
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R R Location of Components Figure 003 (SHEET 1)
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R R Location of Components Figure 003 (SHEET 2)
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AP/FD Controls and Indicating in the Cockpit Figure 004
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(b)
Multipurpose Control and Display Units (MCDU) These units permit to enter and display a flight plan and the control parameters required by the FMGCs for flight control.
(c)
Takeover and priority pushbutton switches These pushbutton switches identified 8CE1 and 8CE2 are used for AP disconnection and taking of priority in manual control. They are located on the side stick controllers.
(d)
Pitch and roll lock solenoids These two solenoids identified 12CA1 and 12CA2 are associated with four side stick lock relays 21CA, 22CA, 23CA and 24CA. They are active when the AP is engaged. They increase the load threshold on the pitch and roll axes.
(e)
Throttle control levers These control levers are used by the AP/FD system to engage the TAKEOFF and GO AROUND modes.
(f)
SWITCHING panel This panel is located on the center pedestal and comprises the switching controls necessary to perform a changeover in the event of a failure.
(g)
Rudder artificial feel solenoid 16CA This solenoid serves to increase the threshold of the rudder artificial feel in the vertical stabilizer. This solenoid is associated with two relays 15CA1 and 15CA2 in the avionics compartment.
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