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between VS1g for aircraft of the A320 family and VSmin for conventional aircraft types. As a
result, Authorities allow aircraft of the A320 family to use the following factors:
‐ V2 = 1.2 × 0.94 VS1g = 1.13 VS1g
‐ VREF = 1.3 × 0.94 VS1g = 1.23 VS1g
These speeds are identical to those that the conventional 94 % rule would have defined for
these aircraft. The A318, A319, A320, and A321 have exactly the same maneuver margin
that a conventional aircraft would have at its reference speeds.
The FCOM uses VS for VS1g.
VLS : Lowest Selectable Speed.
Represented by the top of an amber strip along the airspeed scale on the PFD.
Computed by the FAC, based on aerodynamic data, and corresponds to 1.13 VS during
takeoff, or after a touch and go.
Becomes 1.23 VS, after retraction of one step of flaps.
Becomes 1.28 VS, when in clean configuration.
Note: If in CONF 0 VLS were 1.23 VS (instead of 1.28 VS), the alpha protection strip
would hit the VLS strip on the PFD.
Above 20 000 ft, VLS is corrected for Mach effect to maintain a buffet margin of 0.2 g.
In addition, VLS increases with speed brakes extension.
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. Equal to about 1.26 VS of CONF 1 + F.
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 about 1.23 VS of clean configuration.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
OPERATING SPEEDS DEFINITION
A318/A319/A320/A321 FLEET PRO-SUP-10 P 12/16
FCOM 19 AUG 10
O : Green dot speed.
Engine-out operating speed in clean configuration.
(Best lift-to-drag ratio speed).
Also corresponds to the final takeoff speed.
Represented by a green dot on the PFD scale.
Below 20 000 ft equal to 2 × weight (tons) +85
Above 20 000 ft, add 1 kt per 1 000 ft
PROTECTION SPEEDS
Applicable to: ALL
Vα PROT, Vα MAX and VSW are computed by the FAC, based on aerodynamic data. They are only
used for display on the PFD, and not for flight control protection (the activation of the protections is
computed by the ELAC).
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.
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 FAC according to the aircraft configuration.
Is equal to VMO (or speed corresponding to MMO), VLE or VFE.
LIMIT SPEEDS
Applicable to: ALL
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 only using the primary flight controls, after a sudden failure of the critical engine,
the other engine remaining at takeoff power.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
OPERATING SPEEDS DEFINITION
A318/A319/A320/A321 FLEET PRO-SUP-10 P 13/16
FCOM 19 AUG 10
VMCA : Minimum control speed in flight at which the aircraft can be controlled with a
maximum bank of 5 °, 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 °, 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 SPEEDS
Applicable to:
V1 : The highest speed, during takeoff, at which the flight crew has a choice
between continuing the takeoff or stopping the aircraft.
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 14(54)
