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Air carrier medium large transport aircraft transponder erroneously transmitted the wrong aircraft altitude to ATC.
| Attributes | |
| ACN | 205281 |
| Time | |
| Date | 199203 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : psp |
| State Reference | CA |
| Altitude | msl bound lower : 13500 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : zla |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 9500 flight time type : 1000 |
| ASRS Report | 205281 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 3600 flight time type : 195 |
| ASRS Report | 205378 |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
ATC reported an altitude deviation of approximately 500 ft. We changed to second transponder-encoder and all read ok. Reported transponder-encoder to maintenance, no problems occurred.
Original NASA ASRS Text
Title: ACR MLG ACFT TRANSPONDER ERRONEOUSLY XMITTED THE WRONG ACFT ALT TO ATC.
Narrative: ATC RPTED AN ALTDEV OF APPROX 500 FT. WE CHANGED TO SECOND TRANSPONDER-ENCODER AND ALL READ OK. RPTED TRANSPONDER-ENCODER TO MAINT, NO PROBLEMS OCCURRED.
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.