Narrative:

The G4 departed runway 28. There was no primary or secondary radar return. This is the 14TH time this situation has been documented. At least 2 nmacs were caused by this lack of radar coverage. The FAA has done nothing to correct this. Callback conversation with reporter revealed the following information: the frequency of the problem varies in that weeks may pass before the problem recurs, that it happens with different aircraft types rather than a specific type. Reporter alleges that FAA says there is nothing wrong with the system but to use the 'uncorrelated target' switch with the runway 28 departures. It was the analyst's understanding from discussion with the reporter that by using this, fewer hits are required by the system to declare a target. Reporter stated 14 ucrs have been filed on the problem.

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Original NASA ASRS Text

Title: RPTR SIT OF NO PRIMARY OR SECONDARY RADAR RETURN ON SOME RWY 28 DEPS. RPTR CLAIMS THERE HAVE BEEN 2 NMACS CAUSED BY THIS LACK OF COVERAGE.

Narrative: THE G4 DEPARTED RWY 28. THERE WAS NO PRIMARY OR SECONDARY RADAR RETURN. THIS IS THE 14TH TIME THIS SIT HAS BEEN DOCUMENTED. AT LEAST 2 NMACS WERE CAUSED BY THIS LACK OF RADAR COVERAGE. THE FAA HAS DONE NOTHING TO CORRECT THIS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE FREQ OF THE PROB VARIES IN THAT WKS MAY PASS BEFORE THE PROB RECURS, THAT IT HAPPENS WITH DIFFERENT ACFT TYPES RATHER THAN A SPECIFIC TYPE. RPTR ALLEGES THAT FAA SAYS THERE IS NOTHING WRONG WITH THE SYS BUT TO USE THE 'UNCORRELATED TARGET' SWITCH WITH THE RWY 28 DEPS. IT WAS THE ANALYST'S UNDERSTANDING FROM DISCUSSION WITH THE RPTR THAT BY USING THIS, FEWER HITS ARE REQUIRED BY THE SYS TO DECLARE A TARGET. RPTR STATED 14 UCRS HAVE BEEN FILED ON THE PROB.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.