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MANAGED SPEED/MACH TARGET
Applicable to: ALL
When the speed target is managed, the SPD/MACH window of the FCU shows dashes, and the
corresponding dot is lighted. The PFD speed scale shows the speed target in magenta.
ENGAGEMENT CONDITIONS
The SPD target is managed, whenever AP or FD is engaged, and one of the following occurs:
‐ The flight crew pushes in the SPD/MACH knob
‐ EXPEDITE mode is engaged
‐ V2 is inserted in the MCDU
‐ The speed reference system (SRS) is engaged (takeoff or go-around mode).
Note: At takeoff, SRS will not engage if V2 is not available.
DISENGAGEMENT CONDITIONS
Managed speed disengages any time the flight crew selects a speed target on the FCU, or if the
speed was preselected.
SPEED PROFILE
The form of the managed SPD profile depends on the lateral NAV mode.
If NAV mode is engaged, the SPD profile takes into account all the constraints linked to
the flight plan.
The SPD profile is:
V2 - SPD LIM - SPD CSTR (if applicable) - ECON CLB SPD/MACH - ECON CRZ MACH -
ECON or preset DES MACH/SPD -SPD LIM - SPD CSTR (if applicable) - HOLD SPD (if
applicable) - VAPP.
If NAV mode is not engaged, the SPD/MACH constraints are not considered.
The SPD profile is:
V2 - SPD LIM - ECON CLB SPD/MACH - ECON CRZ MACH - ECON or preset DES
MACH/SPD - SPD LIM - VAPP.
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 2/6
FCOM 19 AUG 10
Note: 1. When both AP/FDs are OFF, A/THR reverts to selected SPEED mode, except
when the approach phase is activated on MCDU where both managed and
selected SPD are available.
2. When expedite mode is engaged, the system disregards SPD LIM and SPD CSTR
no matter what lateral mode is engaged.
3. The managed speed/Mach target may be set below maneuvering speed but
as long as the speed target is managed, the FMGS limits the aircraft to the
maneuvering speed of the current slats/flaps configuration (VAPP, F, S, Green
Dot).
4. If the managed speed/Mach target is set above VMAX (VFE, VMO, MMO), the
FMGS automatically limits the speed to VMAX.
5. If a SPD/MACH constraint has already been taken into account, it remains applied
(until a more restrictive constraint applies).
MINI GROUND SPEED
In approach phase, the managed speed target is the Mini Ground Speed target computed by the
Flight Guidance (FG) part of the FMGS. Refer to DSC-22_30-90 General for details.
SELECTED SPEED/MACH TARGET
Applicable to:
To use a selected speed/Mach target, the flight crew uses the knob on the FCU to set the target
speed, which is then displayed in the FCU window. It is also displayed in blue on the PFD speed
scale.
Note: The selected speed/Mach target may be set beyond VLS or VMAX, but when autothrust is
active, the guidance limits the speed to VLS or VMAX.
Selected speed has priority over managed speed. The only automatic change-over from selected to
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 SPD AUTO, SET HOLD SPD, or
SET VFTO or SET GREEN DOT ).
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)
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 3/6
FCOM 19 AUG 10
‐ The MCDU has a preselected speed for the next phase, and the aircraft transitions into that
phase
‐ The FMGC is powered up in flight.
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.
SELECTED SPEED/MACH TARGET
Applicable to:
,
,
MSN,,,,
To use a selected speed/Mach target, the flight crew uses the knob on the FCU to set the target
speed, which is then displayed in the FCU window. It is also displayed in blue on the PFD speed
scale.
Note: The selected speed/Mach target may be set beyond VLS or VMAX, but when autothrust is
active, the guidance limits the speed to VLS or VMAX.
Selected speed has priority over managed speed. The only automatic change-over from selected to
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 2(82)
