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Any ENG N1 > 80 %or one Thrust Lever ‐ > MCT (≥ FLX if FLX or DERATED TO),
and
‐ The difference between the ENG N1’s exceeds 35 %.
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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INDICATING / RECORDING SYSTEMS
INDICATIONS ON PFD
A318/A319/A320/A321 FLEET DSC-31-40 P 12/68
FCOM 19 AUG 10
AIRSPEED
Applicable to:
(1) Actual Airspeed Reference Line and Scale
A white scale, on a grey background, moves in front of a fixed yellow reference line (next to a
yellow triangle) to indicate airspeed. The minimum airspeed indication is 30 kt.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INDICATING / RECORDING SYSTEMS
INDICATIONS ON PFD
A318/A319/A320/A321 FLEET DSC-31-40 P 13/68
FCOM 19 AUG 10
(2) Speed Trend (yellow)
This pointer starts at the speed symbol. The tip indicates the speed the aircraft will reach in
10 s, if its acceleration remains constant. if its acceleration remains constant. The pointer only
appears, when it is greater than2 kt, and disappears when it is less than 1 kt.
It also disappears, if the FACs 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 the airspeed manually entered on the FCU for selected speed mode (blue). The target speed
is a magenta double bar (=) when associated with the ECON speed range.
Otherwise it is a triangle (magenta or blue).
When the target speed is off the speed scale, its value is displayed as numbers, either above
or below the speed scale.
(4) Mach Number (green)
It is displayed, when it is greater than0.5.
(5) Speed Protection (green)
This symbol indicates the speed (VMO +6 kt or MMO +0.01) at which overspeed protection
becomes active (Refer to DSC-27-20-20 GENERAL).
(6) ECON Speed Range (magenta)
In descent mode with the ECON/AUTO SPD mode active, these two half triangles replace the
selected speed symbol. It shows the upper and lower limits, calculated by the FMGC.
The upper speed is target ‐ speed +20 kt, limited to VMAX or VMO -3 kt or MMO -0.006,
whichever is lowest.
‐ If a speed limit or a speed constraint applies, the upper margin is limited to ECON SPD
+5 kt.
‐ The lower speed margin is the target speed -20 kt, limited to green dot, F, S, or VLS,
whichever is higher.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INDICATING / RECORDING SYSTEMS
INDICATIONS ON PFD
A318/A319/A320/A321 FLEET DSC-31-40 P 14/68
FCOM 19 AUG 10
(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)
VLS information is inhibited from touchdown until 10 s after liftoff.
(2) Alpha Protection Speed
The top of a black and amber strip along the speed scale indicates this speed.
It represents the speed corresponding to the angle of attack at which alpha protection
becomes active (Refer to DSC-27-20-10-20-A PROTECTIONS - HIGH ANGLE OF ATTACK
PROTECTION).
It is displayed when in pitch normal law.
(3) Alpha Max Speed
The top of a red strip along the speed scale indicates this speed. It represents the speed
corresponding to the maximum angle of attack that the aircraft can attain in pitch normal law
(Refer to DSC-27-20-10-20-A PROTECTIONS - HIGH ANGLE OF ATTACK PROTECTION).
It is displayed when in pitch normal law.
(4) VMAX
The lower end of a red and black strip along the speed scale defines this speed.
It is the lowest of the following :
‐ VMO or the speed corresponding to MMO
‐ VLE
‐ VFE
(Refer to PRO-SUP-10 Characteristic Speeds)
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
INDICATING / RECORDING SYSTEMS
INDICATIONS ON PFD
A318/A319/A320/A321 FLEET DSC-31-40 P 15/68
FCOM 19 AUG 10
(5) Stall Warning Speed (VSW)
The top of a red and black strip along the speed scale defines this speed.
It is the speed corresponding to the stall warning. (Refer to DSC-27-20-10-20-A
PROTECTIONS - HIGH ANGLE OF ATTACK PROTECTION).
VSW information is inhibited from touchdown until 5 s after liftoff.
It is displayed when operating in pitch alternate or pitch direct law.
　
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