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• the cross-side data is valid
• the LOC on both sides are tuned identically and are valid
• approach mode is selected
LOC Deviation
When the LOC comparator is enabled and the pilot’s and copilot’s lateral deviations
differ by more than a predetermined amount, a yellow “LOC” comparator flag shows
in the compass arc. The amount of difference allowed varies with the location of the
pilot’s localizer. As the pilot’s localizer moves toward the center of the display, the
comparison tolerance decreases.
For example, when the pilot’s side deviation pointer is at the center of the scale, the
comparator allows up to approximately +½ dots of deviation error on the copilot’s side
before showing the comparator warning flag.
G/S Deviation
When the G/S comparator is enabled and the pilot’s and copilot’s lateral deviations
differ by more than a predetermined amount, a yellow “GS” comparator flag shows
below the glideslope scale. The limits vary with the position of the pilot’s deviation
pointer. As it moves closer to the centerline of the scale, the comparison tolerance
decreases.
SYSTEM FLAG VALUE
HEADING HDG > 6°
ROLL ROL > 3° Approach, > 4° En route
PITCH PIT > 3° Approach, > 4° En route
ALTITUDE ALT 60 ft with BARO set within 0.02 inches.
The amount of difference required to trigger
the flag increases as altitude increases.
AIRSPEED IAS > 10 kts above 90 kts
FLIGHT INSTRUMENTS
For Training Purposes Only
May 03
11-9
P I LOT T R A I N I N G GU I D E
For example, when the pilot’s side deviation pointer is at the center of the scale, the
comparator allows up to approximately +¾ dots of deviation error on the copilot’s side
before showing the comparator warning flag.
RA Deviation
When the RA comparator is enabled and the pilot’s and copilot’s RA difference is not
within limits, a yellow “RA” comparator flag shows below the attitude indicator. To
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
　
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