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Dab controller issues alternate control instructions to DC9 when dab cenrap (center radar ARTS presentation/processing) fails to track DC9 radar target. See acn 494560 and 499223 for additional information.
| Attributes | |
| ACN | 494560 |
| Time | |
| Date | 200012 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mlb.airport |
| State Reference | FL |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dab.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 9r |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 13 |
| ASRS Report | 494560 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | ATC Facility |
| Primary Problem | ATC Facility |
| Situations | |
| ATC Facility | radar equipment : dab.tracon |
Narrative:
Dab was on cenrap (radar). I was vectoring air carrier X on a right downwind to runway 9R at mlb for an ILS. Abeam the outer marker, the aircraft dropped out of radar contact. I turn the aircraft north bound to try to reacquire the target. I had difficulty getting a point out from orlando approach. I reacquired the target and vectored for ILS. As I was clearing the aircraft for the approach, the target disappeared again. This has been a reoccuring problem with the patrick radar feed for dab. If the radar worked properly, we would not have to be on cenrap. This created a dangerous situation. The pilot had to fly out of his way. I would not have seen any VFR targets to have called traffic. To air carrier X. If the aircraft would have not reacquired when it did, I would have taken the aircraft out for a full non-radar approach which would have caused additional delays.
Original NASA ASRS Text
Title: DAB CTLR ISSUES ALTERNATE CTL INSTRUCTIONS TO DC9 WHEN DAB CENRAP (CENTER RADAR ARTS PRESENTATION/PROCESSING) FAILS TO TRACK DC9 RADAR TARGET. SEE ACN 494560 AND 499223 FOR ADDITIONAL INFO.
Narrative: DAB WAS ON CENRAP (RADAR). I WAS VECTORING ACR X ON A R DOWNWIND TO RWY 9R AT MLB FOR AN ILS. ABEAM THE OUTER MARKER, THE ACFT DROPPED OUT OF RADAR CONTACT. I TURN THE ACFT N BOUND TO TRY TO REACQUIRE THE TARGET. I HAD DIFFICULTY GETTING A POINT OUT FROM ORLANDO APCH. I REACQUIRED THE TARGET AND VECTORED FOR ILS. AS I WAS CLRING THE ACFT FOR THE APCH, THE TARGET DISAPPEARED AGAIN. THIS HAS BEEN A REOCCURING PROB WITH THE PATRICK RADAR FEED FOR DAB. IF THE RADAR WORKED PROPERLY, WE WOULD NOT HAVE TO BE ON CENRAP. THIS CREATED A DANGEROUS SIT. THE PLT HAD TO FLY OUT OF HIS WAY. I WOULD NOT HAVE SEEN ANY VFR TARGETS TO HAVE CALLED TFC. TO ACR X. IF THE ACFT WOULD HAVE NOT REACQUIRED WHEN IT DID, I WOULD HAVE TAKEN THE ACFT OUT FOR A FULL NON-RADAR APCH WHICH WOULD HAVE CAUSED ADDITIONAL DELAYS.
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.