PSS A319/A320/A321 Systems Manual 系统手册(4)

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If the airspeed is below 30 knots, the scale is xed at 30 knots.
‚ Speed Trend
An arrow extending from the actual airspeed line shows aircraft acceleration and
displays the speed which will be attained in 10 seconds if present acceleration
remained constant.
ƒ Target Airspeed
Gives the active FMS speed target. If the target is outside the displayed scale, the
triangle is replaced by a numeric readout above or below the scale.
The triangle or readouts are magenta if target is Managed speed automatically
computed by FMS according to ight plan or active ight stage, and are cyan if the
target is speed manually selected on FCU.
„ Mach Number
Appears if current Mach number is greater than 0.5
 VMAX
‚ VLS
ƒ Alpha Protection
„ Alpha Max
 VMAX
Lowest of:
- Maximum operating speed if in clean conguration
- Maximum gear down speed if gear down
- Maximum aps extended speed for current ap conguration
‚ VLS
Mimimum selectable speed
ƒ Alpha Protection
Speed corresponding to angle of attack at which alpha protection becomes active
„ Alpha Max
Speed corresponding to maximum angle of attack that may be reached in pitch
normal law
A319/320/321
Systems Manual
Phoenix Simulation Software P 12
REV 01 SEQ 001 PRIMARY FLIGHT DISPLAY
Airspeed (continued)
Managed Descent speed range
When aircraft is in Managed Descent (DES) guidance mode, and in managed speed, the airspeed may vary
to maintain the computed descent path. In these modes the target speed triangle is replaced by a = mark
and two brackets indicate allowable airspeed range. The range is managed speed target plus minus 20
knots, accounting for ight plan speed limits and minimum and maximum operating speeds.
1
F
S
Decision Speed (V1)
V1 speed selected through MCDU. Digitally
shown in top part of the scale if outside visible
range. Displayed only on the ground. If V speeds
are not selected, a red “SPD SEL” ag is displayed
above airspeed scale.
F speed
Minimum ap retraction speed, visible when
aps are in conguration 3, 2 or 1+F
S speed
Minimum slat retraction speed, visible when
aps are in conguration 1
O
VFE NEXT
Maximum aps extended speed for the next
(greater) ap lever position
Green Dot
Maneuvering speed in clean conguration
A319/320/321
Systems Manual
Phoenix Simulation Software P 13
REV 01 SEQ 001 PRIMARY FLIGHT DISPLAY
Altitude
 Altitude
‚ Target Altitude
ƒ Vertical Speed
„ Baro Reference
 Altitude
Displays current aircraft barometric altitude. If altitude is negative, white “NEG”
ag appears near the readout window. The window will ash yellow when aircraft
approaches altitude target, and ash amber when it deviates from the target. The
readout turns amber if aircraft descents below MDA (if dened).
‚ Target Altitude
Indicates altitude selected on FCU. If the target is outside visible scale, it is
displayed in numeric form above or below the scale. If managed vertical guidance
mode (CLB or DES) and ight plan contains a constraint altitude which is closer
than one selected on FCU, displayed target shows this constraint in magenta
color.
ƒ Vertical Speed
The VS scale is marked at 500, 1000, 1500 and 2000 fpm. Digital readout appears
and moves together with the needle at greater than ±200 fpm. Readout turns
amber at excessive climb or descent rates.
„ Baro Reference
STD (standard) or QNH altimeter settings in selected units, as selected on EFIS
control panel. If reference is STD and aircraft is below transition altitude, or
reference is QNH and aircraft is above transition level, the Baro indication will be
boxed in ashing yellow.
Baro controls,
EFIS control panel
Select in Hg
Decrease
settings
Select hPa
Increase
settings
Toggle
QNH / STD
Terrain indication
Ground level, based on radar altimeter.
Descent Path Indicator
This symbol is automatically displayed during FMS
Descent and Approach phases. The indicator displays
aircraft’s vertical relationship to computed descent
path. In this example, the aircraft is slightly below
the path. Maximum symbol movement represents
±500 ft deviation.
A319/320/321
Systems Manual
Phoenix Simulation Software P 14
　
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