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ATC equipment problem radar ARTS IIIA mode C wrong altitude display potential less than standard separation between air carrier X and Y.
| Attributes | |
| ACN | 228798 |
| Time | |
| Date | 199212 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : tpa |
| State Reference | FL |
| Altitude | msl bound lower : 12000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : tpa |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Experience | controller military : 5 controller radar : 10 |
| ASRS Report | 228798 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
| Situations | |
| Navigational Aid | Unspecified |
Narrative:
I noticed a potential conflict when air carrier X observed leaving 10000 ft, accelerated and appeared to be overtaking air carrier Y. Before taking action, I monitored air carrier Y's mode C, for about one full sweep, to ensure that it was not erroneous; because I had already observed air carrier X mode C to be inaccurate. Air carrier Y's mode C appeared to be accurate; so action was taken to insure lateral separation.
Original NASA ASRS Text
Title: ATC EQUIP PROBLEM RADAR ARTS IIIA MODE C WRONG ALT DISPLAY POTENTIAL LTSS BTWN ACR X AND Y.
Narrative: I NOTICED A POTENTIAL CONFLICT WHEN ACR X OBSERVED LEAVING 10000 FT, ACCELERATED AND APPEARED TO BE OVERTAKING ACR Y. BEFORE TAKING ACTION, I MONITORED ACR Y'S MODE C, FOR ABOUT ONE FULL SWEEP, TO ENSURE THAT IT WAS NOT ERRONEOUS; BECAUSE I HAD ALREADY OBSERVED ACR X MODE C TO BE INACCURATE. ACR Y'S MODE C APPEARED TO BE ACCURATE; SO ACTION WAS TAKEN TO INSURE LATERAL SEPARATION.
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.