曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
knots represents the equivalent
of Mach .82
VVMMAAXX==MMmmoo
MMAACCHHNNuummbbeerr
EFIS MENU
PFD Presentation 41/97
300
320
340
360
240
260
280
300
.782
320
o
A green circle indicates the
best lift drag ratio speed for the
aircraft in clean configuration.
This speed is known as Green
Dot Speed.
GGrreeeennDDoott SSppeeeedd
EFIS MENU
PFD Presentation 42/97
300
320
340
360
.636
During an FMGS computed
(managed) descent the single
triangle is split into two to give a
speed range. A double magenta bar
indicates the target speed. In the
example shown the target speed is
325 knots. The speed will vary in
between the two speed range
indicators as the aircraft maintains
the required descent profile.
Managed descent profiles will be
studied in depth in the Autoflight
modules.
Managed Target
Airspeed
Upper speed range
indication
Lower speed range
indication
EFIS MENU
PFD Presentation 43/97
300
320
340
360
220
240
260
280
=
o
Following initial deceleration
to 250 knots there is an indication
of the next flap limiting speed,
VFE Next. In this case the next
flap setting is 1 so an indication
is shown at 230 knots. The VFE
Next indication will be visible
provided the aircraft is below
15,000 feet.
Green Dot Speed may also be
visible.
GGrreeeennDDoott SSppeeeedd
VVFFEENNeexxtt
EFIS MENU
PFD Presentation 44/97
220
240
260
280
=
o
180
200
220
240
=
o
140
A further deceleration to
Green Dot Speed takes the
airspeed below the VFE for the
first flap selection.
Flap 1 can now be selected.
Notice that a target speed of
140 knots has appeared. This
represents the approach speed
target.
Click on the Flap lever.
VVFFEENNeexxtt
EFIS MENU
PFD Presentation 45/97
180
200
220
240
=
o
140
160
180
200
220
=
S
Once the flap lever is in
position 1, S Speed, VFE Next
and the Flap limit speed
indications will appear.
The speed will decrease
towards S speed.
VVFFEENNeexxtt
FFllaapp LLiimmiitt ssppeeeedd,, VVFFEE
SSSSppeeeedd
EFIS MENU
PFD Presentation 46/97
160
180
200
220
=
S
140
Notice that at S speed the
aircraft is below the limit speed
for the next flap setting, VFE
Next.
Flap 2 can now be selected.
Click on the Flap lever.
VVFFEENNeexxtt
SSSSppeeeedd
EFIS MENU
PFD Presentation 47/97
160
180
200
220
=
S
140
160
180
200
220
=
F
140
As soon as the flap lever is in
position 2 S Speed is removed.
F Speed, and a new VFE Next
indications will appear. The Flap
limit speed will move to a new
limit.
VVFFEENNeexxtt
FFllaapp LLiimmiitt ssppeeeedd,, VVFFEE
FF ssppeeeedd
EFIS MENU
PFD Presentation 48/97
160
180
200
220
=
F
140
Notice that the approach speed
target, V Approach, has now
appeared as a magenta triangle.
The aircraft will continue
decelerating towards F speed.
By reducing towards F speed
the aircraft will be below the VFE
for the next flap setting.
Flap 3 can now be set.
Click on the Flap lever.
VVFFEENNeexxtt
FFllaapp LLiimmiitt ssppeeeedd,, VVFFEE
VVAApppprrooaacchh SSppeeeedd
EFIS MENU
PFD Presentation 49/97
160
180
200
220
=
F
140
140
160
180
200
=
F
120
As before VFE Next and VFE
move to reflect the new flap
position.
Flap full can now be selected.
Click on the Flap lever
VVFFEENNeexxtt
FFllaapp LLiimmiitt ssppeeeedd,, VVFFEE
EFIS MENU
PFD Presentation 50/97
140
160
180
200
=
F
120
100
120
140
160
The aircraft will eventually
stabilize at V Approach and the VFE
will be adjusted to reflect Full Flap.
There are indications associated
with speed and angle of attack
protections. These protection
indications will be discussed in the
flight control modules.
PPrrootteeccttiioonn ssppeeeeddss
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空客a320飞机概述2(21)
