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Discrepancy in altitude readout at ATC, but reporter pilot says he did not deviate from the assigned altitude. The aircraft had just been in the avionics shop and the transponder mode C may have been erroneous.
| Attributes | |
| ACN | 333850 |
| Time | |
| Date | 199604 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cty |
| State Reference | FL |
| Altitude | msl bound lower : 9000 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| 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 : commercial pilot : instrument |
| Experience | flight time last 90 days : 30 flight time total : 1500 flight time type : 900 |
| ASRS Report | 333850 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Controller said altitude deviation shown on my mode C. I was straight and level and did not deviate from assigned altitude. Just got plane out of avionics shop and possible mode C malfunction occurred. Was vectored over water near cty to nitts intersection when told about deviation.
Original NASA ASRS Text
Title: DISCREPANCY IN ALT READOUT AT ATC, BUT RPTR PLT SAYS HE DID NOT DEVIATE FROM THE ASSIGNED ALT. THE ACFT HAD JUST BEEN IN THE AVIONICS SHOP AND THE XPONDER MODE C MAY HAVE BEEN ERRONEOUS.
Narrative: CTLR SAID ALTDEV SHOWN ON MY MODE C. I WAS STRAIGHT AND LEVEL AND DID NOT DEVIATE FROM ASSIGNED ALT. JUST GOT PLANE OUT OF AVIONICS SHOP AND POSSIBLE MODE C MALFUNCTION OCCURRED. WAS VECTORED OVER WATER NEAR CTY TO NITTS INTXN WHEN TOLD ABOUT DEV.
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.