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managed speed target may occur at go-around mode engagement.
In flight, if the situation calls for managed speed, both the PFD and the MCDU display a message
proposing a manual change to managed speed (for example, SET MANAGED SPEED, SET HOLD
SPEED, or SET GREEN DOT SPEED).
ENGAGEMENT CONDITIONS
The aircraft has a selected speed target under any one of the following conditions:
The flight crew pulls out ‐ the SPD/MACH knob (5 s after lift-off)
‐ Both AP/FDs are OFF (except in APPR phase)
‐ The FM speed target is lost (except in SRS, G/S, LAND, and GO AROUND modes)
‐ The MCDU has a preselected speed for the next phase, and the aircraft transitions into that
phase
‐ The FMGC is powered up in flight.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
SPEED/MACH CONTROL
A318/A319/A320/A321 FLEET DSC-22_30-40 P 4/6
FCOM 19 AUG 10
DISENGAGEMENT CONDITIONS
The selected speed target disengages:
‐ When the managed SPD engages
‐ When the aircraft is on ground at engine start.
Note: With engines running, the flight crew can select a speed on the FCU only after takeoff.
AUTO SPD
Applicable to: ALL
The flight crew may insert the AUTO SPD (speed or Mach) on the PERF DES page to replace the
ECON DES SPD.
In this case, the managed speed profile takes into account the selected value. The top of descent
and the descent path are computed on AUTO SPD assumption.
SPEED/MACH SWITCHING
Applicable to: ALL
At the crossover altitude, the FMGC automatically changes the selected speed target to the
corresponding MACH target. The FCU displays the Mach number corresponding to the speed at the
switching altitude.
Note: When the speed is selected, the flight crew can do the switching manually by pressing the
SPD/MACH pb on the FCU. The FCU then displays the aircraft Mach number.
When the target speed is managed, the FMGC commands the switchover automatically as a function
of the ECON MACH value.
MANAGED SPEED TARGET MEMORIZATION
Applicable to: ALL
A dual FM failure has different consequences when it occurs in different phases of the flight.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
SPEED/MACH CONTROL
A318/A319/A320/A321 FLEET DSC-22_30-40 P 5/6
FCOM 19 AUG 10
The system handles target speed and SPD mode as follows:
During approach with LOC and G/S engaged and radio altitude ‐ < 700 ft, the target speed is set to
VAPP as previously memorized, and managed SPD target is maintained.
‐ At go-around, the target speed becomes the memorized go-around speed, which is the higher of
VAPP or the speed when go-around was initiated. Managed SPD target is maintained.
‐ In all other cases, managed target speed reverts to selected, the value being the speed at the
moment of the failure.
SPEED/MACH FCU WINDOW SYNCHRONIZATION
Applicable to: ALL
When the target SPD is managed, the SPD/MACH display of the FCU shows dashes.
However, the window displays the target SPD or MACH in the following situations:
‐ The flight crew turns the SPD/MACH knob.
If the flight crew does not pull the knob within 10 s after turning it, the selection reverts to dashes.
‐ The flight crew manually engages a selected SPD target.
‐ If the flight crew has manually preselected a speed or Mach number for the next phase on the
MCDU PERF page, that preselected SPD/MACH engages when the aircraft enters that phase and
the FCU window then displays as the target the preselected speed or Mach.
‐ If the FMGS is powered up in flight, the synchronized speed/Mach value is the current aircraft
speed or Mach number.
‐ If no V2 is entered at takeoff, the V/S mode engages 5 s after lift-off (no speed reference system).
The FCU speed target is the speed at V/S mode engagement. (A/THR becomes active when the
thrust levers are set in the active range).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
SPEED/MACH CONTROL
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-22_30-40 P 6/6
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD MODES GENERAL
A318/A319/A320/A321 FLEET DSC-22_30-50 P 1/2
FCOM 19 AUG 10
AP/FD MODES GENERAL
Applicable to:
The FMGS has guidance parameters for both AP/FD lateral and vertical modes.
The AP/FD lateral modes are:
RWY, RWY TRK Runway, Runway track mode
NAV Nav mode
HDG, TRK Heading, track mode. Also called basic modes
APP NAV Approach Nav mode
　
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