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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) + 107 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.
PROTECTION SPEEDS
Applicable to: ALL
Vα PROT, Vα MAX and VSW are computed by the PRIM, based on aerodynamic data.
Vα PROT: Angle-of-attack protection speed.
Corresponds to the angle-of-attack at which the angle-of-attack protection becomes
active. Represented by the top of a black and amber strip along the PFD speed scale,
in normal law.
Vα MAX : Maximum angle-of-attack speed.
Corresponds to the maximum angle-of-attack that may be reached in pitch normal law.
Represented by the top of a red strip along the PFD speed scale, in normal law.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
OPERATING SPEEDS DEFINITION
A330/A340 FLEET PRO-SUP-10 P 6/8
FCOM 19 AUG 10
VSW : Stall warning speed.
Represented by a red and black strip along the speed scale when the flight control
normal law is inoperative.
VMAX : Represented by the bottom of a red and black strip along the speed scale. Determined
by the FE according to the aircraft configuration. It is equal to VMO (or speed
corresponding to MMO), VLE or VFE.
LIMIT SPEEDS
Applicable to:
VA : Maximum design maneuvering speed. This corresponds to the maximum structural
speed permitted for full control deflection, if alternate or direct law is active.
VMCG : Minimum speed, on the ground during takeoff, at which the aircraft can be controlled
by the use of primary flight controls only, after a sudden failure of the critical engine,
the other engines remaining at takeoff power.
VMCA : Minimum control speed in flight at which the aircraft can be controlled with a
maximum bank of 5 °C, if one engine fails, the other engines remaining at takeoff
power (takeoff flap setting, gear retracted).
VMCL : Minimum control speed in flight at which the aircraft can be controlled with a
maximum bank of 5 °C, if one engine fails, the other engines remaining at takeoff
power (approach flap setting).
VMCL-2 : Minimum control speed in flight at which the aircraft can be controlled with a
maximum bank of 5 °C, if two engines fail on the same side, the other engines
remaining at takeoff power (approach flap setting).
VFE : Maximum speed for each flap configuration.
VLE : Maximum speed with landing gear extended.
VLO : Maximum speed for landing gear operation.
VMO : Maximum speed.
VFE NEXT: Maximum speed for the next (further extended) flap lever position.
LIMIT SPEEDS
Applicable to: ,
VA : Maximum design maneuvering speed. This corresponds to the maximum structural
speed permitted for full control deflection, if alternate or direct law is active.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
OPERATING SPEEDS DEFINITION
A330/A340 FLEET PRO-SUP-10 P 7/8
FCOM 19 AUG 10
VMCG : Minimum speed, on the ground during takeoff, at which the aircraft can be controlled
by the use of primary flight controls only, after a sudden failure of the critical engine,
the other engines remaining at takeoff power.
VMCA : Minimum control speed in flight at which the aircraft can be controlled with a
maximum bank of 5 °C, if one engine fails, the other engine remaining at takeoff
power (takeoff flap setting, gear retracted).
VMCL : Minimum control speed in flight at which the aircraft can be controlled with a
maximum bank of 5 °C, if one engine fails, the other engine remaining at takeoff
power (approach flap setting).
VFE : Maximum speed for each flap configuration.
VLE : Maximum speed with landing gear extended.
VLO : Maximum speed for landing gear operation.
VMO : Maximum speed.
VFE NEXT: Maximum speed for the next (further extended) flap lever position.
OTHER SPEED
Applicable to: ALL
V1 : The highest speed, during takeoff, at which the flight crew has a choice between
continuing the takeoff or stopping the aircraft.
Represented by “1” on the airspeed scale (or the V1 value when it is off the
airspeed scale).
Inserted manually through the MCDU by the crew.
Displayed on the MCDU TAKEOFF page.
VR : The speed at which the pilot rotates in order to reach V2 at an altitude of 35 ft at
the latest after an engine failure.
Inserted manually through the MCDU by the crew.
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 11(59)
