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Pilot of small aircraft has altitude deviation due to turbulence and possible malfunctioning transponder.
| Attributes | |
| ACN | 403410 |
| Time | |
| Date | 199805 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : law |
| State Reference | OK |
| Altitude | msl bound lower : 6650 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : fsi |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 175 flight time total : 7500 flight time type : 380 |
| ASRS Report | 403410 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | inflight encounter : weather |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : insufficient time |
| Consequence | Other Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | other |
Narrative:
While avoiding heavy rain and thunderstorms encountered turbulence causing 300-400 ft altitude variation. Also, ATC possibly showed 200' or more off altitude when altimeter showed on altitude. Transponder was just out of radio shop. Currently getting it checked.
Original NASA ASRS Text
Title: PLT OF SMA HAS ALTDEV DUE TO TURB AND POSSIBLE MALFUNCTIONING XPONDER.
Narrative: WHILE AVOIDING HVY RAIN AND TSTMS ENCOUNTERED TURB CAUSING 300-400 FT ALT VARIATION. ALSO, ATC POSSIBLY SHOWED 200' OR MORE OFF ALT WHEN ALTIMETER SHOWED ON ALT. XPONDER WAS JUST OUT OF RADIO SHOP. CURRENTLY GETTING IT 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.