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Invalid mode 'C' altitude on several air carrier aircraft. Determined that ARTS radar equipment had malfunctioned.
| Attributes | |
| ACN | 142598 |
| Time | |
| Date | 199004 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : scy |
| State Reference | TX |
| Altitude | msl bound lower : 11000 msl bound upper : 100 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 15 |
| ASRS Report | 142598 |
| Person 2 | |
| Affiliation | government : faa |
| Function | oversight : supervisor |
| Qualification | controller : radar |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | other physical facility |
Narrative:
I was working the feeder east high and low position and noticed target with apparent invalid mode 'C'. I verified altitude. Air carrier X level at 11000', mode 'C' showed 12000'. Air carrier Y at 9000', showed 1900' and 900'. Air carrier Z 100' showed 1200'. I reported this to a supervisor and he thought it was the airplanes. I had him to call af maintenance. He called maintenance to check the problem.
Original NASA ASRS Text
Title: INVALID MODE 'C' ALT ON SEVERAL ACR ACFT. DETERMINED THAT ARTS RADAR EQUIPMENT HAD MALFUNCTIONED.
Narrative: I WAS WORKING THE FEEDER E HIGH AND LOW POS AND NOTICED TARGET WITH APPARENT INVALID MODE 'C'. I VERIFIED ALT. ACR X LEVEL AT 11000', MODE 'C' SHOWED 12000'. ACR Y AT 9000', SHOWED 1900' AND 900'. ACR Z 100' SHOWED 1200'. I RPTED THIS TO A SUPVR AND HE THOUGHT IT WAS THE AIRPLANES. I HAD HIM TO CALL AF MAINT. HE CALLED MAINT TO CHK 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.