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the Airspeed scale we will run through a
typical flight profile. We will assume a
departure with the Flaps in position 3. You
will learn about the various flap and slat
configurations in the Flight Control modules.
EFIS MENU
PFD Presentation 29/97
During the take off roll a blue
decision speed, V1, and a magenta
V2 speed are shown. Notice that
since these speeds are beyond the
visible scale they are shown as
numbers.
DDeecciissiioonn ssppeeeedd ((VV11)) ooff 113344 kknnoottss
VV22 ssppeeeedd ooff 115511 kknnoottss
040
060
134
151
EFIS MENU
PFD Presentation 30/97
040
060
134
151
080
100
120
140 1
As the take off progresses V1 and
V2 indications appear on the speed
scale as a blue 1 and a magenta
triangle.
VV22
VV11
EFIS MENU
PFD Presentation 31/97
080
100
120
140 1
140
160
180
200
F
120
Just after lift off the magenta
target speed remains at V2. The
speed demanded by the flight
director will be V2 + 10 knots.
FFlliigghhttDDiirreeccttoorr TTaarrggeett SSppeeeedd VV22 ++1100
EFIS MENU
PFD Presentation 32/97
140
160
180
200
F
120
The minimum Flap retraction speed
is shown by a green F. This is referred
to as F speed.
The Flap limit speed, VFE, is shown
by a red and black strip at the top of the
speed scale.
Minimum Flap retraction speed
F Speed
FFllaapp LLiimmiitt ssppeeeedd,, VVFFEE
EFIS MENU
PFD Presentation 33/97
140
160
180
200
F
120
250
At acceleration altitude the target
speed jumps to 250 knots and the
aircraft is accelerated towards that
speed. Notice that since this speed is
beyond the scale it is shown above
the scale as a number.
TTaarrggeett SSppeeeedd
EFIS MENU
PFD Presentation 34/97
140
160
180
200
F
120
The aircraft is now above the minimum flap
retraction speed, and accelerating. The flaps
can now be retracted to position 1.
Click on the Flap lever to select position 1.
140
160
180
250
200
F
EFIS MENU
PFD Presentation 35/97
140
160
180
250
200
F
The F speed indication is replaced
with an S speed indication. This is
the minimum Slat retraction speed.
Notice that the VFE has increased to
reflect the limiting speed for flap
position 1.
140
160
180
220
S
200
FFllaapp LLiimmiitt ssppeeeedd,, VVFFEE
Minimum Slat retraction speed
S Speed
EFIS MENU
PFD Presentation 36/97
140
160
180
250
220
S
200
160
180
200
220
S
240
The aircraft is now above S speed, and
accelerating, so the flaps can be fully
retracted.
Click on the Flap lever.
TTaarrggeett SSppeeeedd
EFIS MENU
PFD Presentation 37/97
160
180
200
250
220
S
240
220
240
260
280
=
After flap retraction the aircraft
is clean therefore no VFE is
indicated. The aircraft stabilizes
at 250 knots. Notice that the
target speed is in line with speed
reference line.
TTaarrggeett SSppeeeedd
EFIS MENU
PFD Presentation 38/97
220
240
260
280
=
When cleared to accelerate to
climb speed the target speed
jumps to approximately 330
knots. Once again the speed
trend arrow appears.
330
EFIS MENU
PFD Presentation 39/97
220
240
260
280
330
300
320
340
360
Once the speed has stabilized
at climb speed the red and black
VMAX indication will be visible.
Below approximately 25,000
feet the VMAX indication is fixed
at 350 knots to represent Vmo.
A MACH indication appears
below the speed scale once the
speed is above the equivalent of
M 0.5.
VVMMAAXX==VVmmoo
.675 MMAACCHHNNuummbbeerr
EFIS MENU
PFD Presentation 40/97
300
320
340
360
240
260
280
300
.782
320
o
Above approximately 25,000
feet the VMAX indication
becomes the airspeed equivalent
of the Mach Limit Speed, Mmo,
Mach.82.
In the example shown the
aircraft is cruising at Mach .782
and the indicated VMAX of 300
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空客a320飞机概述2(20)
