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ZTL controller concerned with safety as aircraft proceed through known area of radar track speed jumps.
| Attributes | |
| ACN | 461824 |
| Time | |
| Date | 200002 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : odf.vortac |
| State Reference | CA |
| Altitude | msl single value : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | pilot : instrument |
| Experience | flight time total : 1600 |
| ASRS Report | 461824 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera other controllerb other other : radar |
| Resolutory Action | other |
| Supplementary | |
| Problem Areas | ATC Facility Airspace Structure |
| Primary Problem | ATC Facility |
| Situations | |
| ATC Facility | procedure or policy : ztl.artcc radar equipment : ztl.artcc |
Narrative:
Radar jump problem. Known problem for over 8 months. Nothing done to correct. Callback conversation with reporter revealed the following information: reporter stated that a fix was proposed in an attempt to correct this problem. The reporter stated that 29 radar sort boxes would be rest ratified, establishing the radar site at atlanta as being the primary site, the savanna radar site changed from primary to secondary. Maintenance would implement these changes during the may/00 database change cycle. The reporter advised that a safety situation would continue until the rsb change was validated. Supplemental information from acn 461825: radar target jumped 2 or 3 times, 2-3 mi, causing unreliable speed indication on NAS display and uncertainty of true position of aircraft. This condition has existed for several months. I have repeatedly reported it to FAA management, with no results. Supplemental information from acn 461832: target jumps, splits for 2 mins, 15 mi north of odf VOR. Radar sort box 1380. Supplemental information from acn 461836: database jump which changed speed of aircraft on display 420, back to 380, up to 430, back to 318. I report this to supervisors almost every day. It appears nothing will be done until may/00. This is a safety problem.
Original NASA ASRS Text
Title: ZTL CTLR CONCERNED WITH SAFETY AS ACFT PROCEED THROUGH KNOWN AREA OF RADAR TRACK SPD JUMPS.
Narrative: RADAR JUMP PROB. KNOWN PROB FOR OVER 8 MONTHS. NOTHING DONE TO CORRECT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT A FIX WAS PROPOSED IN AN ATTEMPT TO CORRECT THIS PROB. THE RPTR STATED THAT 29 RADAR SORT BOXES WOULD BE REST RATIFIED, ESTABLISHING THE RADAR SITE AT ATLANTA AS BEING THE PRIMARY SITE, THE SAVANNA RADAR SITE CHANGED FROM PRIMARY TO SECONDARY. MAINT WOULD IMPLEMENT THESE CHANGES DURING THE MAY/00 DATABASE CHANGE CYCLE. THE RPTR ADVISED THAT A SAFETY SIT WOULD CONTINUE UNTIL THE RSB CHANGE WAS VALIDATED. SUPPLEMENTAL INFO FROM ACN 461825: RADAR TARGET JUMPED 2 OR 3 TIMES, 2-3 MI, CAUSING UNRELIABLE SPD INDICATION ON NAS DISPLAY AND UNCERTAINTY OF TRUE POS OF ACFT. THIS CONDITION HAS EXISTED FOR SEVERAL MONTHS. I HAVE REPEATEDLY RPTED IT TO FAA MGMNT, WITH NO RESULTS. SUPPLEMENTAL INFO FROM ACN 461832: TARGET JUMPS, SPLITS FOR 2 MINS, 15 MI N OF ODF VOR. RADAR SORT BOX 1380. SUPPLEMENTAL INFO FROM ACN 461836: DATABASE JUMP WHICH CHANGED SPD OF ACFT ON DISPLAY 420, BACK TO 380, UP TO 430, BACK TO 318. I RPT THIS TO SUPVRS ALMOST EVERY DAY. IT APPEARS NOTHING WILL BE DONE UNTIL MAY/00. THIS IS A SAFETY 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.