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MDA 740
Vol. 1 12--70--51
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual
CSP A--013
MASTER
Primary Mode --- Radio Altitude Indications
Figure 12---70---22
AP
10
SYNC
PRI
HDG
ALT
LOC 1
GS
21
1700
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
Flashing characters
indicate that the
airplane has arrived at
the selected decision
height.
During go--around,
alert is disabled at
DH +100 feet.
Alerts inhibited
below 5 feet.
Selected Decision
Height Readout
(Example: DH 100)
Indicates decision height, in
1--foot increments as set at
DH knob on altitude
reference panel (range is 0 to
999 feet).
Radio Altitude Readout
Indicates radio altitude
from 0 to 2,500 feet.
50--foot increments from
2,500 to 1,000 feet;
10--foot increments from
1,000 to 50 feet;
5--foot increments from
50 to10 feet;
1--foot increments from
10 to 0 feet;
Negative radio altitude
is displayed as 0 feet.
Below 2,500 feet AGL, a radio altimeter failure is
indicated by the above failure flag and the radio
altitude readout is removed.
A comparison between the two radio altitude
sources is only performed below 1,000 feet
AGL. A miscompare is indicated by the same
failure flag but the radio altitude readout is
retained. The flag flashes for 5 seconds when
the miscompare is first detected and thereafter
remains displayed until the condition is
corrected.
APPROACHING MINIMUMS
MINIMUMS
FIVE HUNDRED
DECISION HEIGHT
FIFTY
FORTY
THIRTY
TWENTY
TEN
Decision Height Alert
Example: DH 100
RA Failure Flag
10
32 000
DH 100
MDA 740
RA
REV 56, Jan 31/03
Vol. 1 12--70--52
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual MASTER
CSP A--013
Primary Mode --- Vertical Speed Indications
Figure 12---70---23
Vertical Speed Failure Flag
V/S
Indicates current vertical speed in feet
per minute (fpm). Range is from
--15,000 fpm to +15,000 fpm.
Displayed in increments of 100 fpm
when the vertical speed is less than
10,000 fpm (e.g. 2,500 fpm is
displayed as 2.5).
Displayed in increments of 1,000 fpm
when the vertical speed is equal to
or greater than 10,000 fpm (e.g.
10,000 fpm is displayed as 10).
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
ELV 200
Indicates loss of
vertical speed data
from pilot’s IRS.
Flag appears in place
of vertical speed
readout.
Vertical Speed Readout
Vol. 1 12--70--53
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual
CSP A--013
MASTER
Primary Mode --- Navigation/Position Indications
Figure 12---70---24 Sheet 1
DME Hold (H) Symbol
( Example: 10.0 H )
When DME hold is
selected, ‘H’ replaces
‘NM’ characters on
DME distance readout.
Indicates DME distance (slant
range) to tuned navigation aid:
From 0 to 99.9 nautical miles
(nm), displayed in 0.1--nm
increments;
Above 100 nm, displayed in
1.0--nm increments;
Dashes (------ NM) replace
readout if DME data is invalid;
If DME information is lost
(loss of signal), readout is
removed.
Ground Speed Readout
Airplane’s ground speed
displayed in 1--knot
increments during flight.
Dashes (------ GS) replace
readout if ground speed
data is invalid;
If ground speed information
is lost (loss of signal),
readout is removed.
Marker Beacon Flags
Indicates airplane passage
over the applicable marker
beacon transmitter.
IM -- Inner marker
MM -- Middle marker
OM -- Outer marker
10 10
AP 10
SYNC
PRI
HDG
ALT
LOC 1
GS
5 5
21
1700
--5 --5
M .545
240
　
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