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It is limited to a minimum of VMCL +10 kt and to a maximum of VFE CONF
FULL–2 kt.
S : Minimum speed at which the slats may be retracted at takeoff.
In approach, used as a target speed when the aircraft is in CONF 1.
Represented by “S” on the PFD airspeed scale.
Equal to 1.21 VS of clean configuration.
In approach, S is limited to a maximum of VFE CONF 1* -2 kt.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
OPERATING SPEEDS DEFINITION
A330/A340 FLEET PRO-SUP-10 P 3/8
FCOM 19 AUG 10
0 : Green dot speed.
Engine-out operating speed in clean configuration.
(Best lift-to-drag ratio speed).
Corresponds also to the final takeoff speed.
Represented by a green dot on the PFD scale.
With all engines running:
Below 20 000 ft equal ‐ to 0.6 × weight (tons) + 115 kt.
‐ Above 20 000 ft, add 1 kt per 1 000 ft
With at least one engine-out, subtract 10 kt, in the above situations.
CHARACTERISTIC SPEEDS
Applicable to: ,
The characteristic speeds displayed on the PFD are computed by the FE (Flight Envelope). VLS (of
normal landing configuration: CONF 3 or FULL), F, S and Green Dot speeds are also displayed on
the MCDU TAKEOFF and/or APPR, GO AROUND pages.
These values are computed by the FMGC.
Computations made by FE and FMGC are based on the gross weight information transmitted by the
FCMC (Fuel Control and Monitoring Computer).
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
OPERATING SPEEDS DEFINITION
A330/A340 FLEET PRO-SUP-10 P 4/8
FCOM 19 AUG 10
VS : Stalling speed.
Not displayed.
For a conventional aircraft, the reference stall speed, VSmin, is based on a load
factor that is less than 1 g. This gives a stall speed that is lower than the stall
speed at 1 g. All operating speeds are expressed as functions of this speed. (For
example, VREF=1.3 VSMIN).
Because the A330 has a low-speed protection feature (alpha limit) that the
flight crew cannot override, the airworthiness authorities have reconsidered the
definition of stall speed for this aircraft.
All the operating speeds must be referenced to a speed that can be
demonstrated by flight test. This speed is designated VS1 g.
Airworthiness authorities have agreed that a factor of 0.94 represents the
relationship between VS1 g for A330 and VSmin for conventional aircraft types.
As a result the authorities allow the A330 to use the following factors:
V2 MIN=1.2×0.94 VS1 g=1.13 VS1 g
VREF=1.3×0.94 VS1 g=1.23 VS1 g
These speeds are identical to those that the conventional 94 % rule would have
defined for this aircraft. The A330 has exactly the same maneuver margin that a
conventional aircraft would have at its reference speeds.
The FCOM uses VS for VS1 g.
VLS : Lowest Selectable speed.
Represented by the top of an amber strip along the airspeed scale on the PFD.
It is equal to:
‐ 1.13 VS, at takeoff
‐ 1.18 VS, when the flaps are retracted.
‐ 1.23 VS, when in clean configuration. (It remains at this value until landing).
VLS is corrected for Mach effect to maintain a 0.3 g buffet margin.
In addition, VLS is increased when the speedbrakes are extended.
The VMC is taken into account for VLS computation as follows:
‐ At takeoff, until retraction of one step of flaps, VLS is equal to or greater than
the lowest of:
• V2/1.05, or
• 1.05 VMCA maximum certified.
‐ In all the other phases, it is equal to or greater than VMCL.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
OPERATING SPEEDS DEFINITION
A330/A340 FLEET PRO-SUP-10 P 5/8
FCOM 19 AUG 10
F : Minimum speed at which the flaps may be retracted at takeoff.
In approach, used as a target speed when the aircraft is in CONF 2 or CONF 3.
Represented by “F” on the PFD speed scale.
At takeoff, it is equal to about 1.18 VS of CONF 1+F, and is limited to a minimum
of VMCL + 5 kt.
In approach, when the aircraft is in CONF 2, the takeoff value is increased by
14 %. It is limited to a minimum of VMCL + 15 kt and to a maximum of VFE
CONF 3 – 2 kt.
Then, when the aircraft is in CONF 3, the takeoff value is increased by 4 %. It is
limited to a minimum of VMCL +10 kt and to a maximum of VFE CONF FULL –
2 kt.
S : Minimum speed at which the slats may be retracted at takeoff.
In approach, used as a target speed when the aircraft is in CONF 1.
Represented by “S” on the PFD airspeed scale.
Equal to 1.21 VS of clean configuration.
In approach, S is limited to a maximum of VFE CONF 1* - 2 kt.
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 11(58)
