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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
‐ 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 selected 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 selected DES
MACH/SPD - SPD LIM - VAPP.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
SPEED/MACH CONTROL
A330/A340 FLEET DSC-22_30-40 P 2/4
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. The managed speed/Mach target may be set below maneuvering speed but
as long as the speed target is managed, the FMGES limits the aircraft to the
maneuvering speed of the current slats/flaps configuration (VAPP, F, S, Green
Dot).
3. If the managed speed/Mach target is set above VMAX (VFE, VMO, MMO), the
FMGES automatically limits the speed to VMAX.
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 FMGES. Refer to DSC-22_30-90 General for details.
SELECTED SPEED/MACH TARGET
Applicable to: ALL
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 MANAGED SPEED, SET HOLD
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 below 700 ft RA in takeoff, LAND or go-around mode
‐ The MCDU has a preselected speed for the next phase, and the aircraft transitions into that
phase
‐ The FMGEC is powered up in flight
‐ 5 s after lift off when a takeoff is initiated without managed or selected speed.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
SPEED/MACH CONTROL
A330/A340 FLEET DSC-22_30-40 P 3/4
FCOM 19 AUG 10
DISENGAGEMENT CONDITIONS
The selected speed target disengages when:
‐ The managed speed target engages
‐ On ground at AP or FD engagement
‐ On ground at engine start.
Note: It is not possible to activate selected speed mode on ground with engines running and
FD ON until after takeoff.
SELECTED DESCENT SPEED
Applicable to: ALL
A manual speed or Mach may be inserted by the flight crew on the PERF DES page to replace the
ECON DES SPD.
In this case, although the value is selected by the flight crew, this speed or Mach is taken into
account to compute the top of descent and the descent profile.
SPEED/MACH SWITCHING
Applicable to: ALL
At the crossover altitude, the FMGEC 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 FMGEC commands the switchover automatically as a
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 2(38)
