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100
900
800
00
000
1
240
220
200
180
160
Indicated
Airspeed
Scale / Tape
Moving scale
with fixed pointer
(speed index)
that indicates
current airspeed.
Range is 40 to
400 knots with
80 knots in view.
Displayed only
when the HGS is
in the primary
mode.
Indicated
Airspeed Bug
Indicates airspeed
as selected at
SPEED knob on
flight control panel
Indicated Mach
Readout
Indicates Mach to the
nearest hundredth.
Displayed at and above
0.45 Mach.
M .545
250
Selected Airspeed
Readout
Displays selected airspeed
when the airspeed value is
out of range of the currently
displayed airspeed scale
(only during flight).
In the approach mode (AIII,
AII, AI, F/D and VMC), the
readout is displayed at all
times.
1--knot increments
250
Speed Index
HDG
1--knot increments
REV 56, Jan 31/03
Vol. 1 12--70--26
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual MASTER
CSP A--013
Primary Mode --- Airspeed Indications
Figure 12---70---11 Sheet 2
10 10
AP 10
SYNC
PRI
HDG
ALT
LOC 1
GS
5 5
21
1700
--5 --5
120
100
80
60
40
0.0 VS
21
30
2 000
100
900
800
00
000
1
180
160
140
120
2
1
R
T
Reference Speed Bugs
Displayed above 40 KIAS.
Disappear after take--off:
1 -- take--off decision speed (V1).
R -- rotate airspeed (VR)
2 -- take--off safety speed (V2).
Target Speed Bug
Displayed and stays on
above 40 KIAS.
Set to indicate VT.
Overspeed
Clacker
180
V1 125
VT 170
V2 142
VR 133
V1 125
Low Speed Cue
(Checkerboard)
Cue for
impending stall
speed
350
140
120
100
Overspeed
VMO / MMO Cue
(Checkerboard)
Cue for
maximum speed
allowable.
Speed Reference
Table
Displayed below
40 KIAS, in 1--knot
increments.
Corresponds to
selected take--off
reference speeds.
The reference
table disappears
as the speed
marks (bugs) on
the airspeed scale
appear. Range is
from 40 to 400
knots.
Displayed (in 1--knot)
Readout
Reference Speed
increments) during
selection of reference
speed. Prefix depends
upon which reference
speed is being
changed or entered.
Value stays on for 5
seconds when a
take--off reference
speed is changed.
Vol. 1 12--70--27
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual
CSP A--013
MASTER
Primary Mode --- Airspeed Indications
Figure 12---70---11 Sheet 3
10 10
AP 10
SYNC
PRI
HDG
ALT
LOC 1
GS
5 5
21
1700
--5 --5
M .545
240
220
200
180
160
VOR 1
10.0 NM
190 GS
ADF1
ADF2
0.0 VS
21
30
2 000
100
900
800
00
000
1
Air Data Source
Default source is ADC 1 and is not annunciated.
Common source is displayed as ADC 1 or ADC 2,
depending upon the air data source selected.
160
140
Vector travelling
above the speed
index indicates
airplane
acceleration.
160
140
Vector travelling
below the speed
index indicates
airplane
deceleration.
Air Data Failure
An IAS failure is indicated by the above
failure flag and all airspeed data are
removed.
A miscompare is indicated by the same
failure flag but airspeed data is
retained. The flag flashes for 5 seconds
when the miscompare is first detected
and thereafter remains displayed until
the condition is corrected.
Airspeed Error Symbol
Indicates airplane’s
deviation (max 15 KIAS)
from selected airspeed.
The symbol has a
masking window which
obscures most other
symbols that it overlays
except the guidance
cue, runway lines,
approach status
message, TCAS box and
windshear messsage.
Faster than selected
airspeed --
approx 5 KIAS
Slower than selected
airspeed --
approx 15 KIAS
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