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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
• 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
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