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(6) Sideslip Index (yellow)
This trapezoidal index moves beneath the roll index. On ground, it represents the lateral
acceleration of the aircraft. In flight, it shows sideslip (as computed by the PRIM computers).
One centimeter of displacement indicates 0.2 g. The sideslip index is against its stop at 0.3 g.
In case of engine failure at take-off or go-around, the sideslip index changes from yellow to
blue.
Note: The sideslip target is blue if :
Slats/Flaps are in ‐ CONF 1, 1+F, 2, 3 or FULL, and
‐ One thrust lever > MCT (≥ FLX if FLX or DERATED TO), and
‐ At least one engine > 1.3 EPR, and
‐ Engine thrust asymmetry > 0.25 EPR.
In this case the sideslip index is called β target.
When this index is centered with the roll index, the sideslip equals the sideslip target for
optimum aircraft performance.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INDICATING/RECORDING
INDICATIONS ON PFD
A330/A340 FLEET DSC-31-40 P 9/48
FCOM 19 AUG 10
AIRSPEED
Applicable to:
(1) Actual Airspeed Reference Line and Scale
A white scale on a gray background moves in front of a fixed yellow reference line next to a
yellow triangle to show airspeed. The minimum airspeed indication is 30 kt.
(2) Speed Trend (yellow)
This pointer starts at the speed symbol. The tip shows the speed the aircraft will reach in 10 s
if its acceleration remains constant. The pointer appears only when it is greater than 2 kt and
disappears when it is less than 1 kt.
It also disappears if the FMGCs fail.
(3) Target Airspeed (magenta or blue)
This symbol gives the target airspeed or the airspeed corresponding to the target Mach
number.
The target airspeed is the airspeed computed by FMGC in managed speed mode (magenta) or
entered manually on the FCU for selected speed mode (blue).
When the target speed is off the speed scale, its value is displayed as numbers below or above
the speed scale.
(4) Mach Number (green)
This is displayed when it is greater than 0.5 and the LS pushbutton is not selected on the EFIS
control panel.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INDICATING/RECORDING
INDICATIONS ON PFD
A330/A340 FLEET DSC-31-40 P 10/48
FCOM 19 AUG 10
(5) Speed Protection (green)
This symbol indicates the speed (VMO + 4 kt or MMO + 0.006) at which overspeed warning
will occur. This symbol is not displayed in pitch alternate or direct law because the protection
is not available. (Refer to DSC-27-20-20-30 RECONFIGURATION CONTROL LAWS - PFD
DISPLAY)
AIRSPEED
Applicable to: ,
(1) Actual Airspeed Reference Line and Scale
A white scale on a gray background moves in front of a fixed yellow reference line next to a
yellow triangle to show airspeed. The minimum airspeed indication is 30 kt.
(2) Speed Trend (yellow)
This pointer starts at the speed symbol. The tip shows the speed the aircraft will reach in 10 s
if its acceleration remains constant. The pointer appears only when it is greater than 2 kt and
disappears when it is less than 1 kt.
It also disappears if the FMGCs fail.
(3) Target Airspeed (magenta or blue)
This symbol gives the target airspeed or the airspeed corresponding to the target Mach
number.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INDICATING/RECORDING
INDICATIONS ON PFD
A330/A340 FLEET DSC-31-40 P 11/48
FCOM 19 AUG 10
The target airspeed is the airspeed computed by FMGC in managed speed mode (magenta) or
entered manually on the FCU for selected speed mode (blue).
When the target speed is off the speed scale, its value is displayed as numbers below or above
the speed scale.
(4) Mach Number (green)
This is displayed when it is greater than 0.5.
(5) Speed Protection (green)
This symbol indicates the speed (VMO + 4 kt or MMO + 0.006) at which overspeed warning
will occur. This symbol is not displayed in pitch alternate or direct law because the protection
is not available. (Refer to DSC-27-20-20-30 RECONFIGURATION CONTROL LAWS - PFD
DISPLAY)
AIRSPEED (CONT'D)
Applicable to: ALL
(1) Minimum Selectable Speed (VLS)
The top of the amber strip along the speed scale indicates this speed. It represents the lowest
selectable speed providing an appropriate margin to the stall speed. (Refer to PRO-SUP-10
Characteristic Speeds)
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INDICATING/RECORDING
INDICATIONS ON PFD
A330/A340 FLEET DSC-31-40 P 12/48
FCOM 19 AUG 10
VLS information is inhibited from touchdown until 1 s after liftoff.
(2) Alpha Protection Speed
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 3(67)
