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A fokker 100 in cruises at FL280 is advised by ATC that transponder is indicating 500 ft lower than assigned altitude.
| Attributes | |
| ACN | 477700 |
| Time | |
| Date | 200006 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : fat.airport |
| State Reference | CA |
| Altitude | msl single value : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | F28 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j7.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 11500 flight time type : 1300 |
| ASRS Report | 477700 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : unable none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
ATC reported that our transponder altitude indicated 500 ft lower than what we were assigned. Our altimeters showed we were at our assigned altitude. Changed encoding (altimetric) source and no further problems.
Original NASA ASRS Text
Title: A FOKKER 100 IN CRUISES AT FL280 IS ADVISED BY ATC THAT XPONDER IS INDICATING 500 FT LOWER THAN ASSIGNED ALT.
Narrative: ATC RPTED THAT OUR XPONDER ALT INDICATED 500 FT LOWER THAN WHAT WE WERE ASSIGNED. OUR ALTIMETERS SHOWED WE WERE AT OUR ASSIGNED ALT. CHANGED ENCODING (ALTIMETRIC) SOURCE AND NO FURTHER PROBS.
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.