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Mode C altitude readout on radar scope switches back and forth from 5000 ft to 7000 ft on an aircraft level at 6000 ft.
| Attributes | |
| ACN | 230150 |
| Time | |
| Date | 199212 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : tpa |
| State Reference | FL |
| Altitude | msl bound lower : 5000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : tpa |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 11 |
| ASRS Report | 230150 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument |
| 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 | |
| Navigational Aid | Unspecified |
Narrative:
I was working the east high radar position at tampa approach. I had small transport X IFR overflying my sector level at 67000 MSL. I observed my radar display the mode 'C' of the aircraft first at 5000 and alternate to 7000 several different times. The aircraft was always level at 6000.
Original NASA ASRS Text
Title: MODE C ALT READOUT ON RADAR SCOPE SWITCHES BACK AND FORTH FROM 5000 FT TO 7000 FT ON AN ACFT LEVEL AT 6000 FT.
Narrative: I WAS WORKING THE E HIGH RADAR POS AT TAMPA APCH. I HAD SMT X IFR OVERFLYING MY SECTOR LEVEL AT 67000 MSL. I OBSERVED MY RADAR DISPLAY THE MODE 'C' OF THE ACFT FIRST AT 5000 AND ALTERNATE TO 7000 SEVERAL DIFFERENT TIMES. THE ACFT WAS ALWAYS LEVEL AT 6000.
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.