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ARTCC controller at ZFW states that the facility radar mode C is routinely displaying wrong information and claims it is off as much as 300 ft to 3000 ft.
| Attributes | |
| ACN | 410531 |
| Time | |
| Date | 199808 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zfw |
| State Reference | TX |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw artcc : zfw |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 10 |
| ASRS Report | 410531 |
| Person 2 | |
| Affiliation | government : faa |
| Function | other personnel other |
| Qualification | other other : other |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | other physical facility procedure or policy : unspecified |
| Navigational Aid | Unspecified |
Narrative:
The radar mode C on mlc-lo routinely displaying wrong information. Aircraft would report and verify level at an altitude and our radar would show them at a different altitude varying by 300 ft to sometimes 3000 ft. This would happen to numerous aircraft in different areas in the sector and was obviously a radar mode C error instead of a bad mode C report from many aircraft. This problem continues to be reported and is still happening. It is unsafe to base aircraft vertical separation on unreliable data received by our radar.
Original NASA ASRS Text
Title: ARTCC CTLR AT ZFW STATES THAT THE FACILITY RADAR MODE C IS ROUTINELY DISPLAYING WRONG INFO AND CLAIMS IT IS OFF AS MUCH AS 300 FT TO 3000 FT.
Narrative: THE RADAR MODE C ON MLC-LO ROUTINELY DISPLAYING WRONG INFO. ACFT WOULD RPT AND VERIFY LEVEL AT AN ALT AND OUR RADAR WOULD SHOW THEM AT A DIFFERENT ALT VARYING BY 300 FT TO SOMETIMES 3000 FT. THIS WOULD HAPPEN TO NUMEROUS ACFT IN DIFFERENT AREAS IN THE SECTOR AND WAS OBVIOUSLY A RADAR MODE C ERROR INSTEAD OF A BAD MODE C RPT FROM MANY ACFT. THIS PROB CONTINUES TO BE RPTED AND IS STILL HAPPENING. IT IS UNSAFE TO BASE ACFT VERT SEPARATION ON UNRELIABLE DATA RECEIVED BY OUR RADAR.
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.