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• Both sides are using the same heading reference (MAG or TRU);
• Both side 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.
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.
FLIGHT INSTRUMENTS
Description
Vol. 2 11−10−5
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ELECTRONIC FLIGHT INSTRUMENT SYSTEM (EFIS) (CONT'D)
Altitude Comparator Graph
Figure 11−10−4
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:
Trip Values
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
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.
FLIGHT INSTRUMENTS
Description
Vol. 2 11−10−6
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ELECTRONIC FLIGHT INSTRUMENT SYSTEM (EFIS) (CONT'D)
The following conditions must be valid to enable the CAT II comparisons:
• The on-side RA is valid and RA is less than 1,000 feet;
• The cross-side data is valid;
• The LOC on both sides are tuned identically and are valid; and
• 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 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.
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 1,000 feet and the cross-side 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)].
FLIGHT INSTRUMENTS
Description
Vol. 2 11−10−7
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ELECTRONIC FLIGHT INSTRUMENT SYSTEM (EFIS) (CONT'D)
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庞巴迪挑战者604操作手册 Operating Manual 4(16)
