primary RADAR, the ATCRBS coverage is a function of many factors such as specific
location, antenna patterns, and so forth.
Usable RADAR coverage does not mean a usable target return on every scan at every
azimuth and all usable altitudes. Controllers use the target strength classifications
shown in Table 12-5.
Usable target. Target leaves trail or persists from scan-to-scan
Usable target. Target shows each scan and remains on the
display for at least 1/3 of the scan.
Unusable target. Weak target, barely visible, possible miss.
Unusable target. No visible target.
Usable target. Visible target, satisfactory for ATC purposes.
Unusable target. No visible target, unsatisfactory for ATC
Table 12-5 -- Target strength classifications
When a flight inspection of a system is done, the flight inspection team performs certain
actions and assigns a classification to inspected systems.
Post Flight Inspection Actions
Upon completion of a flight inspection, the flight inspection team should perform the