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Clt TRACON controller reported an aircraft's mode C quit working after it appeared it would not make a crossing restriction.
| Attributes | |
| ACN | 1477095 |
| Time | |
| Date | 201708 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | CLT.TRACON |
| State Reference | NC |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR BANKR |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 2.0 |
| Events | |
| Anomaly | ATC Issue All Types Aircraft Equipment Problem Less Severe Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural FAR Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
Aircraft X checked in descending via the STAR landing north and reported their altitude as 18;500 feet; which matched the mode C readout. This appeared to be a very high altitude and they had a crossing restriction coming up which was 12000-11000 feet. While the aircraft was over [fix]; the mode C showed 14500 feet. I asked aircraft X to say altitude; and the pilot reported '12;000 feet. At that point the mode C disappeared off the screen and they became transponder only. The pilot then said 'uh we're having some issues with our mode C; we'll try another one'. The aircraft continued to track the arrival with no altitude readouts. There was another crossing restriction of 9;000 feet coming up as well. After they passed that fix; their mode C became active again and showed 9;000 feet.I suggested that local management needed to follow up via a brasher warning; to which they declined. We had a verified mode C readout that was 2;500 feet high on the arrival when the mode C disappeared; which would be seem to be a pilot deviation.
Original NASA ASRS Text
Title: CLT TRACON Controller reported an aircraft's Mode C quit working after it appeared it would not make a crossing restriction.
Narrative: Aircraft X checked in descending via the STAR landing north and reported their altitude as 18;500 feet; which matched the Mode C readout. This appeared to be a very high altitude and they had a crossing restriction coming up which was 12000-11000 feet. While the aircraft was over [fix]; the mode C showed 14500 feet. I asked Aircraft X to say altitude; and the pilot reported '12;000 feet. At that point the Mode C disappeared off the screen and they became transponder only. The pilot then said 'Uh we're having some issues with our Mode C; we'll try another one'. The aircraft continued to track the arrival with no altitude readouts. There was another crossing restriction of 9;000 feet coming up as well. After they passed that fix; their Mode C became active again and showed 9;000 feet.I suggested that local management needed to follow up via a brasher warning; to which they declined. We had a verified Mode C readout that was 2;500 feet high on the arrival when the Mode C disappeared; which would be seem to be a pilot deviation.
Data retrieved from NASA's ASRS site 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.