Published Report (DOT/FAA/CT-94-36)

GLOSSARY
Aimort Surveillance Radar (ASR1 - Approach control radar used to
detect and display an aircraft's position in the terminal area.
ASR provides range and azimuth information but does not provide
elevation data. Coverage of the ASR can extend up to 60 miles.
Automated Radar Terminal System (ARTS1 IIIA - The modular,
programmable ARTS which detects, tracks, and predicts primary as
well as secondary radar-derived aircraft targets. This
sophisticated computer driven system upgrades the existing ARTS
by providing improved tracking, continuous data recording, and
failsoft capabilities.
Blunder - An unexpected turn by an aircraft already established
on the localizer toward another aircraft.
Closest Point of Armroach (CPA1 - The smallest slant range
distance between two aircraft involved in a conflict. The
distance is measured from the center of each aircraft involved.
Chi suuare - A statistical test for determining goodness-of-fit.
Goodness-of-fit is an expression of how well any set of observed
data conforms to some expected distribution. Tests for
evaluating goodness-of-fit are based on the sum of squared
deviations between the observed and expected values.
Conflict - Occurs whenever two or more aircraft approach each
other with less than the minimum allowable airspace separation.
A conflict occurs if there is less than a minimum of 1000 ft
vertical and a minimum distance of 3 nautical miles (mi) between
aircraft.
CPA Prediction Tool - Presents a window of
for predicting separation between aircraft
aircra ft alignments
Final Monitor Aid [F'MAI - A high resolution color display that is
equipped with the controller alert system hardware/software which
is used in the precision runway monitor (PRM) system. The
display includes alert algorithms providing the target
predictors, a color change alert when a target penetrates or is
predicted to penetrate the no transgression zone (NTZ), a color
change alert if the aircraft transponder becomes inoperative,
synthesized voice alerts, digital mapping, and like features
contained in the PRM system.
Flisht Technical Error (FTE) - The accuracy with which the pilot
controls the aircraft as measured by the indicated aircraft
position with respect to the indicated command or desired
position. It does not include procedural blunders.
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