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ARTCC radar controller indicates a possible altitude deviation due to erroneous mode C readouts from the radar site.
| Attributes | |
| ACN | 689470 |
| Time | |
| Date | 200602 |
| Place | |
| Locale Reference | navaid : prb.vortac |
| State Reference | CA |
| Altitude | msl bound lower : 8000 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc tower : mem.tower |
| Operator | general aviation : personal |
| Make Model Name | PA-24 Turbo Comanche |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | general aviation : personal |
| Make Model Name | Duchess 76 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 689470 |
| Person 2 | |
| Affiliation | other |
| Function | oversight : pic |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Navigational Facility |
| Primary Problem | Navigational Facility |
Narrative:
BE76 assigned 8000 ft; mode C in NAS showed 100-200 ft low. Aircraft reported at 8000 ft. PA24 assigned 7000 ft; mode C in NAS indicated 100-200 ft high. Pilot reported 7100 ft correcting. WX front was moving through at the time. This is also an area of erroneous mode C from the radar site. At times NAS will be 100-200 ft from darc readout causing issues.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR INDICATES A POSSIBLE ALTDEV DUE TO ERRONEOUS MODE C READOUTS FROM THE RADAR SITE.
Narrative: BE76 ASSIGNED 8000 FT; MODE C IN NAS SHOWED 100-200 FT LOW. ACFT RPTED AT 8000 FT. PA24 ASSIGNED 7000 FT; MODE C IN NAS INDICATED 100-200 FT HIGH. PLT RPTED 7100 FT CORRECTING. WX FRONT WAS MOVING THROUGH AT THE TIME. THIS IS ALSO AN AREA OF ERRONEOUS MODE C FROM THE RADAR SITE. AT TIMES NAS WILL BE 100-200 FT FROM DARC READOUT CAUSING ISSUES.
Data retrieved from NASA's ASRS site as of January 2009 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.