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the runway center line on the
yaw axis and the flare on the
pitch axis.
Engages below 50 ft RA as a
function of the current vertical
speed.
INTERACTION BETWEEN AP/FD AND A/THR MODES
Applicable to: ALL
The AP and FD pitch modes can control a target SPD/MACH or a vertical trajectory, and the A/THR
mode can control a fixed thrust or a target SPD/MACH. However, the AP/FD and the A/THR cannot
both control a target SPD/MACH simultaneously.
Therefore the AP/FD pitch modes and A/THR mode are coordinated as follows:
If an AP/FD pitch mode controls a vertical trajectory, ‐ the A/THR mode controls the target
SPD/MACH.
‐ If an AP/FD pitch mode controls a target SPD or MACH, the A/THR mode controls the thrust.
‐ If no AP/FD pitch mode is engaged, the A/THR mode reverts to controlling the SPD/MACH mode.
In other words, the selection of an AP/FD pitch mode determines which mode the A/THR controls.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
GENERAL
A318/A319/A320/A321 FLEET DSC-22_30-10 P 8/8
FCOM 19 AUG 10
AP/FD pitch modes A/THR modes
V/S - FPA
DES (geometric path)
ALT*, ALT
ALT CRZ*, ALT CRZ
ALT CST*, ALT CST
G/S*, G/S
FINAL, FINAL APP
AP/FD OFF
SPEED/MACH MODE
CLB/DES (idle path)
OP CLB/OP DES
EXP CLB/EXP DES ��
SRS
THR (CLB, IDLE) MODE
FLARE RETARD (IDLE)
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
FLIGHT DIRECTOR
A318/A319/A320/A321 FLEET DSC-22_30-20 P 1/6
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The Flight Director (FD) displays guidance commands from the Flight Management and Guidance
Computer (FMGC) on the Primary Flight Display (PFD).
The flight crew may manually fly the aircraft, following FMGC guidance commands, or crosscheck
the FMGC orders when the autopilot is engaged.
In normal operations, FD1 displays FMGC1 orders on the PFD1 and FD2 displays FMGC2 orders on
the PFD2.
The FDs use their respective onside FMGCs.
On the PFD:
1. The FD pitch and roll crossbars show pitch and roll demands.
2. Below 30 ft during landing and takeoff, when a localizer is available, the vertical bar is replaced by
a yaw bar that gives lateral orders.
3. The Flight Path Director (FPD) symbol relates to the Flight Path Vector (FPV).
The HDG V/S – TRK FPA pb on the FCU enables the flight crew to select either type of reference
and display.
The FD pb on the Electronic Flight Instrument System (EFIS) control panel allows the FD bars to be
displayed or removed.
FD BARS (HDG V/S SELECTED ON THE FCU)
The pitch bar is displayed if a vertical mode is engaged. It gives ‐ pitch orders for the vertical
guidance
‐ The roll bar is displayed if a lateral mode is engaged. It gives roll orders for lateral guidance.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
FLIGHT DIRECTOR
A318/A319/A320/A321 FLEET DSC-22_30-20 P 2/6
FCOM 19 AUG 10
FLIGHT PATH DIRECTOR (TRK FPA SELECTED ON THE FCU)
The display is an alternate way of transmitting flight director commands.
‐ The Flight Path Vector (FPV) symbol illustrates the track and flight path angle actually being
flown
The Flight Path Director (FPD) symbol shows the flight crew ‐ how to intercept the required
vertical and lateral flight trajectory. When the flight crew superimposes the FPV and the FPD
symbols, the aircraft is flying the required trajectory.
YAW BAR
The yaw bar is displayed in RWY mode on takeoff and in FLARE and ROLL OUT modes at
landing.
FLIGHT DIRECTOR (FD) ENGAGEMENT
Applicable to:
The FDs are engaged automatically when the FMGC powers up.
GROUND ENGAGEMENT
‐ The "1FD2" symbol appears on both PFDs
‐ No FD bars appear on the PFDs. (The PFD displays FD orders when a mode is active on the
corresponding axis)
‐ The FCU windows display dashes.
FLIGHT ENGAGEMENT
The two FDs engage in the HDG V/S or TRK FPA modes (basic modes).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
FLIGHT DIRECTOR
A318/A319/A320/A321 FLEET DSC-22_30-20 P 3/6
FCOM 19 AUG 10
FLIGHT DIRECTOR (FD) ENGAGEMENT
Applicable to:
,
,
MSN,,,,
The FDs are engaged automatically when the FMGC powers up.
GROUND ENGAGEMENT
‐ ___________The "1FD2" symbol appears on both PFDs
‐ No FD bars appear on the PFDs. (The PFD displays FD orders when a mode is active on the
　
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