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BE58 aircraft had erroneous mode C altitude readout. Approach controller questioned altitude and reporter pilot verified it, but it was 200 ft off.
| Attributes | |
| ACN | 381620 |
| Time | |
| Date | 199709 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : clt |
| State Reference | NC |
| Altitude | msl bound lower : 2100 msl bound upper : 2300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : clt |
| Operator | general aviation : personal |
| Make Model Name | Baron 58/58TC |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 120 flight time total : 2600 flight time type : 500 |
| ASRS Report | 381620 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : unable other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
While descending VFR on an IFR flight plan the controller asked me to verify my altitude. I replied 2300 ft, the altitude I was cleared to. The controller (charlotte approach) said 'I was indicating 2100 ft, but that was within limits.' I assured him I was at 2300 ft. No further discussion. When I arrived at rock hill, sc, 10 mins later, the FBO operator said the charlotte tower had called twice and said to get my mode C fixed. I will get the mode C checked.
Original NASA ASRS Text
Title: BE58 ACFT HAD ERRONEOUS MODE C ALT READOUT. APCH CTLR QUESTIONED ALT AND RPTR PLT VERIFIED IT, BUT IT WAS 200 FT OFF.
Narrative: WHILE DSNDING VFR ON AN IFR FLT PLAN THE CTLR ASKED ME TO VERIFY MY ALT. I REPLIED 2300 FT, THE ALT I WAS CLRED TO. THE CTLR (CHARLOTTE APCH) SAID 'I WAS INDICATING 2100 FT, BUT THAT WAS WITHIN LIMITS.' I ASSURED HIM I WAS AT 2300 FT. NO FURTHER DISCUSSION. WHEN I ARRIVED AT ROCK HILL, SC, 10 MINS LATER, THE FBO OPERATOR SAID THE CHARLOTTE TWR HAD CALLED TWICE AND SAID TO GET MY MODE C FIXED. I WILL GET THE MODE C CHKED.
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.