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10
059
NAV SECTOR
RADAR OFF
FMS MAP
TRAFFIC OVERLAY
LX/WX G+3 USTB T+10.7
TAS 0 0
RW24L
HOKKE
CYOW
YUL
1NM
38NM
119NM
14NM
0:07
0:25
0:03
:
:
:
:
DME1
– – – –
DME2
– – – –
25
50
239
S
21
W
30
5.0
UTC04:23 GS SAT 15C TAT 15C
FMS2
YUL
DTK 333
12.7NM
TTG :04
ADF1 ADF2
YUL
HOKKE
CYUL
-20
-12
MFD FORMATS
ADDITIONAL INFORMATION DISPLAYS
FLIGHT INSTRUMENTS
11-6 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
EFIS Comparator Monitor
Data displayed on the two PFDs is continuously compared for deviations. When
defined trip levels are exceeded, the EFIS COMP MON caution EICAS message is
displayed, and the flashing MASTER CAUTION lights are triggered.
The comparator monitor has two sections; the full-time comparators and the
Category II comparators.
Full-Time Comparator
Full-time comparator warning is performed for pitch, roll, heading, altitude and
airspeed data. Comparator warnings appear in yellow and flash temporarily on the
PFD. They then remain displayed while the condition exists.
A subsequent EFIS comparator monitor indication will not cause
another Master Caution to flash. Only the comparator indication
on the PFD will flash.
Pitch
Pitch comparator monitoring is enabled if both sides are using different Inertial
Reference System (IRS) sources and both sources have not failed (any ATT flag).
When enabled, if the pilot’s and copilot’s displayed pitch difference is greater than 4°
when en route, or greater than 3° during approach, the pitch comparator warning
“PIT” shows on the attitude indicator.
Roll
Roll comparator monitoring is enabled if both sides are using different IRS sources,
and both sources have not failed (any ATT flag). When enabled, if the pilot’s and
copilot’s roll difference is greater than 4° when en route, or greater than 3° during
approach, the comparator warning “ROL” shows on the attitude indicator.
Heading
The heading comparator is enabled when:
• both sides are using the same heading reference (MAG or TRU)
• both sides are using different IRS sources, and
• both sources have not failed (no HDG flag)
If the heading comparator is enabled and the heading difference is greater than 6°, the
heading comparator warning “HDG” shows on the compass arc.
NOTE
FLIGHT INSTRUMENTS
For Training Purposes Only
May 03
11-7
P I LOT T R A I N I N G GU I D E
Altitude
The altitude comparator is enabled if both sides are using different air data sources and
both sides have not failed (no ALT flag). If the altitude comparator is enabled and the
altitude difference is not within limits, the altitude comparator warning “ALT” shows
vertically on the lower portion of the altitude scale. As the altitude increases, so do the
altitude difference limits, as indicated by the following formula: if the ALT difference
exceeds [60 + (pilot’s altitude + copilot’s altitude)/460] feet, the altitude comparator
warning shows.
Altitude Comparator Graph
Figure 11-4
Indicated Airspeed
The airspeed comparator is enabled if both sides are using different air data sources,
both sides have not failed (no IAS flag), and the indicated airspeed is greater than 90
knots. If the airspeed comparator is enabled and the airspeed difference is greater than
10 knots, the airspeed comparator warning “IAS” shows on the upper portion of the
airspeed scale.
The following table summarizes the trip values for the full-time comparator
monitoring functions:
250
150
0
Altimeter difference
Altitude difference = [60 + (pilot’s altitude + copilot’s altitude)/460]
0 10,000 15,000
P604_11_045
300
200
100
50
5,000 20,000 25,000 30,000 35,000 40,000 45,000
Aircraft Altitude
FLIGHT INSTRUMENTS
11-8 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Category II Comparator
Category II comparators are enabled if approach mode is selected and the DH is set
below 200 feet. Comparator monitoring is performed for LOC, G/S and Radio
Altimeter deviations.
The following conditions must be valid to enable the CAT II comparisons:
• the on-side RA is valid and RA is less than 1000 feet
　
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