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corresponding axis)
‐ The FCU windows display dashes.
MANUAL FLIGHT ENGAGEMENT
The two FDs engage in the HDG V/S or TRK FPA modes (basic modes).
AUTOMATIC FLIGHT ENGAGEMENT
FD bars are automatically restored in SRS/GA TRK modes at go-around engagement. If FPV/FPD
was previously selected, it reverts to FD bars.
FLIGHT DIRECTOR (FD) DISENGAGEMENT
Applicable to: ALL
The flight crew may disengage one or two FDs manually, or FDs may disengage automatically if
there is a failure.
MANUAL DISENGAGEMENT
One FD OFF:
The FD bars no longer ‐ appear on the associated PFD.
‐ The corresponding FD is disengaged.
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 4/6
FCOM 19 AUG 10
Both FDs OFF:
‐ The FD bars disappear from both PFDs.
‐ If no AP was engaged, lateral and vertical modes disengage. The A/THR, if active, automatically
reverts to (or remains in) SPEED/MACH mode.
‐ If one AP was engaged when FDs are switched OFF, this AP remains engaged in the active
modes but the FDs are no longer displayed.
AUTOMATIC DISENGAGEMENT
If one FD fails or one FMGC is not valid, both PFDs display the remaining FD.
AUTOMATIC DISENGAGEMENT DUE TO SPEED PROTECTION
When APs are not engaged and the flight crew does not follow the FD bars to maintain the
commanded trajectory in climb with CLB or OP CLB (or EXP CLB �� ) engaged or in descent
with DES or OP DES (or EXP DES �� ) engaged, the FDs will disengage at the activation of the
automatic speed mode protection.
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 5/6
FCOM 19 AUG 10
Refer to DSC-22_30-75-A Reversion with Global Speed Protection - Automatic Speed Mode
Protection in Climb.
AUTOMATIC FD REMOVAL
Applicable to: ALL
‐ The FD pitch bar is removed when no vertical mode is engaged or when ROLL OUT mode is
engaged.
‐ The FD roll bar is removed when no lateral mode is engaged or when the RWY or ROLL OUT
mode is engaged.
‐ Both FDs are removed when the aircraft pitch exceeds 25 ° up or 13 ° down, or bank angle
exceeds 45 °.
Note: If AP/FDs are OFF, and FD2 then FD1 are engaged within 180 ms (one computation cycle),
a flip flop of master FMGC may occur.
As a result, no vertical mode engages, the FMA 1st column, 1st line (A/THR mode) is blank
or displays dashes.
Engaging V/S mode manually reselects the correct FMGC and restores the display.
FD WARNINGS
Applicable to: ALL
FD bar WARNINGS CONDITIONS
Pitch FD bar (or FPV) flashes 10 s If the ALT* mode is lost further ‐ to FCU altitude reference
change of more than 250 ft.
‐ When in APPR mode (G/S*, G/S, LAND, FINAL), FD
reverts to V/S mode (flight crew action or loss of vertical
approach mode).
‐ One AP or one FD is engaged while both AP/FD were
previously OFF.
Pitch FD bar (or FPV) flashes permanently Transmission of the GLIDE data is interrupted when in G/S,
G/S* or LAND modes above 100 ft RA.
Roll FD bar (or FPV) flashes 10 s ‐ When in APPR mode (LOC*, LOC, LAND, APP NAV), FD
reverts to HDG mode (flight crew action or loss of lateral
approach mode).
‐ One AP or one FD is engaged while both AP/FD were
previously OFF.
Roll FD bar (or FPV) flashes permanently Transmission of the LOC data is interrupted when in LOC,
LOC* or LAND modes above 15 ft RA.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
FLIGHT DIRECTOR
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-22_30-20 P 6/6
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOPILOT (AP)
A318/A319/A320/A321 FLEET DSC-22_30-30 P 1/6
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The AP:
‐ Stabilizes the aircraft around its center of gravity
‐ Acquires and tracks a flight path
‐ Flies the aircraft to an automatic landing or go-around.
The AP commands the:
‐ Position of the flight control surfaces for pitch, roll and yaw
‐ Nose wheel position.
AP ENGAGEMENT
Applicable to:
The flight crew can engage AP1 or AP2 by pressing the corresponding pushbutton on the FCU if the
aircraft has been airborne for at least 5 s.
When one AP is engaged, the corresponding FCU pushbutton comes on and AP1 (or 2) is displayed
on the FMAs.
‐ One AP can be engaged on ground if the engines are not running. It disengages when one engine
　
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