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enable the RA comparator, the on-side RA altitude is less than 1000 feet and the crossside
RA is valid. As the altitude increases, so do the RA difference limits increase as
per the following formula: [30 feet + 0.028 X (pilot’s RA height + copilot’s RA
height)].
Radar Altimeter Deviation Limits Graph
Figure 11-5
100
70
60
40
30
0
Radio Altimeter difference
Altitude difference = [30 + 0.028 X (pilot’s RA height + copilot’s RA height)]
RAD ALT Diff
0 250 500 750 1000
P604_11_031
90 ALT Diff
80
50
20
10
Aircraft Altitude
FLIGHT INSTRUMENTS
11-10 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Comparator Indications and EFIS Failure Displays
The Comparator warning icon on the PFD will remain displayed while the condition
exists. If the comparator monitor fails, the Amber EFIS COMP MON INOP caution
EICAS message is displayed, and the flashing MASTER CAUTION lights will be
triggered.
PFD Comparator Annunciations
Figure 11-6
The failure of a selected source removes the respective scale or display and presents a
red flag.
PFD Failure Displays
Figure 11-7
2
R
T
180
160
140
120
20
10
10
20
30
900
800
700
600
500
ADF1
NO FLIGHT PLAN
29.85 IN
LOC1 DR GS
AP
1
2
4
1
2
4
0.8
N
33
S
15
12
E
6
3
1
MDA 580
M.452
LOC1
CRS
4.3H
071
ALTS PATH GS
2500
I
A
S
ROL PIT
GS
RA
LOC HDG
A
L
T
P604_11_032
FD
143
IAS
ADF1
CRS
- - - NM
MSG1
MSG2
310
NO FLIGHT PLAN
N
33
30
W
24
E
6
3
FD
ATT
G
S
LOC
RA
DCP2 TRU
FMS1 LOC1
ADF2
ALT
V
S
GS
1
Airspeed
Flag
Flight
Director
Flag
Attitude
Flag
Display
Control Panel
Source Flag
Navigation
Source Flag
Vertical
Deviation
Flag
Barometric
Altitude
Flag
Vertical
Speed
Flag
Overtemperature
Warning
Radio
Altitude
Flag
Heading
Flag
P604_11_018
DISPLAY TEMP
Expanded Lateral
Deviation Flag
FLIGHT INSTRUMENTS
For Training Purposes Only
May 03
11-11
P I LOT T R A I N I N G GU I D E
The following Failure Flags are available:
Failure flag label Meaning Items removed from
display
ALT Air Data Computer failure Barometric altitude tapes,
digital altitude readout,
preselected altitude
reference, digital preselect
altitude, metric altitude
readout and metric
preselected altitude
ATT Inertial Reference System
failure
Sky/ground raster, pitch
tape, roll pointer, roll scale,
slip/skid indicator
DCP Display Control Panel failure Flight director bars
MAG, TRK, TRU Heading Sensor input failure
Inertial Reference System
failure
The heading display is not
removed, but the heading is
not updated
FD Flight Director failure Flight director bars
FMS/GS/LOC/VOR Respective Navigation System
failure
Flight director bars
Lateral deviation scale
Red boxed Nav Source
GS Glideslope failure Vertical deviation scale and
pointer
IAS Air Data Computer failure Airspeed tape and
information
VS Air Data Computer failure Vertical speed scale pointer,
digital readout
RA Radio Altimeter failure Analog radio altitude
symbology, analog decision
height marker and digital
radio altitude
FLIGHT INSTRUMENTS
11-12 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Air Data System
The Air Data System (ADS) uses air pressure and temperature information to calculate
all of the parameters related to flight. It supplies the following information to EFIS for
display:
• Altitude (ALT)
• Indicated Airspeed (IAS)
• Vertical speed (VS)
• True airspeed (TAS)
• Static Air Temperature (SAT), and
• Total Air Temperature (TAT)
The ADS also provides computed data to:
• Inertial Reference System (IRS)
• Flight Data Recorder (FDR)
• Stall Protection and Flap systems
• Air Traffic Control (ATC) transponders
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