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Definitions
These definitions are terms used by the HGS. They are provided for
informational purposes to assist pilots to better understand how and when
certain HGS functions occur.
Above Ground Level (AGL):
• Equal to corrected altitude when radio altitude is greater than 2500 feet
• Equal to the lesser of radio altitude and corrected altitude when radio
altitude is greater than 50 feet
• Equal to radio altitude when radio altitude is less than 50 feet.
Aircraft Aligned on Runway: occurs when the difference between
Selected Course and Magnetic Heading is less than 10 degrees and the
absolute value of Localizer Deviation is less than one degree for more than
two seconds and the aircraft is not in-flight.
Aligned with ILS: occurs when:
• Both NAV Receivers are tuned to an ILS frequency and valid, and
• Either both Glideslope #1 and Localizer #1 are captured; or both
Glideslope #2 and Localizer #2 are captured, and
• Track Error is less than 15°.
Aircraft In Flight: occurs from the time the aircraft goes Weight Off
Wheels.
Aircraft On Ground: occurs when either main landing gear Weight On
Wheels is detected.
Category (CAT) I: a precision instrument approach which provides for
approaches to a DH of not less than 200 feet/60m and visibility of not less
than 2400 feet/800m, or an RVR of 1800 feet/550m with operative
touchdown zone and runway centerline lights.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
B-2 November 2002 9701-1153 Rev A
Category (CAT) II: a precision instrument approach, which provides for
approaches to a DH between 200 feet/60m and 100 feet/30m and a RVR of
not less than 1200 feet/350m.
Category (CAT) III: FAA AC 120-28D defines CAT III as a precision
instrument approach and landing with a minimum of 50 feet DH and an
RVR of not less than 700 RVR or 200 meters. CAT III operations approval
may allow lower takeoff minimums of 300 feet RVR or 75 meters.
Corrected Altitude: the difference between barometric corrected altitude
and the HCP Runway Elevation.
Decision Height (DH): The RA height at which the required runway visual
reference must be seen, or else a missed approach must be initiated.
Flight Leg: begins when the aircraft accelerates through 10 knots IRS
ground speed. A Flight Leg ends when the aircraft decelerates through 10
knots IRS ground speed or an HC reset occurs.
Glideslope Capture: occurs when glideslope deviation is less than 0.42
degrees (90 μA) for at least 5 seconds. Equivalent to 1.2 dot deflection.
Glideslope Deviation: correlation of glideslope deviation (micro-amps) to
glideslope deviation (degrees) is 0.7° = 150 μA = 2 dots of deflection
(0.175 DDM).
Landing Rollout: starts at Aircraft On Ground and ends when ground
speed is less than 20 knots.
Localizer Deviation: correlation of localizer deviation (micro-amps) to
localizer deviation (degrees) is 150 μA = 2 dots of deflection (0.155 DDM).
Localizer Capture: occurs when Localizer Deviation is less than 0.34
degrees (20 μA) for at least 5 seconds. Equivalent to 0.27 dot deflection.
Low-Visibility Takeoff: aircraft is configured for a Low Visibility Takeoff
when the aircraft is not in flight and both NAV Receivers are tuned to an
ILS frequency and Takeoff mode is selected, the Combiner is not stowed,
and the aircraft is aligned with the runway.
Track Error: difference between aircraft magnetic track angle and selected
course.
Unusual Attitude: occurs when the aircraft pitch attitude is greater than
+30° or -20° or the roll angle is greater than 65° left or right bank.
Weight Off Wheels: occurs when the aircraft left and right main landing
gears detect weight off wheels.
HGS® Pilot Guide for the Bombardier CRJ 700 Model 4200
9701-1153 Rev A November 2002 B-3
Acronyms and Abbreviations
A/C ..................................................................................................Aircraft
ACT...................................................................................................Active
ADC...............................................................................Air Data Computer
ADF..................................................................Automatic Direction Finder
ADI.................................................................. Attitude Direction Indicator
AGL............................................................................ Above Ground Level
ALT .................................................................................................Altitude
AOA ...................................................................................Angle of Attack
　
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