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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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ATC questioned light transport flight crew about their assigned altitude and found that aircraft was transmitting the wrong altitude from the aircraft transponder encoding altimeter.
| Attributes | |
| ACN | 301430 |
| Time | |
| Date | 199504 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : rdg |
| State Reference | PA |
| Altitude | msl bound lower : 4000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : rdg |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 275 flight time total : 3000 flight time type : 1000 |
| ASRS Report | 301430 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | faa : reviewed incident with flight crew Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Controller questioned our altitude while at 4000 ft. He said we showed 5000 ft, we switched encoders and showed level at 4000 ft. No conflicts or anything occurred. Wrote malfunction up in maintenance discrepancy log.
Original NASA ASRS Text
Title: ATC QUESTIONED LTT FLC ABOUT THEIR ASSIGNED ALT AND FOUND THAT ACFT WAS XMITTING THE WRONG ALT FROM THE ACFT XPONDER ENCODING ALTIMETER.
Narrative: CTLR QUESTIONED OUR ALT WHILE AT 4000 FT. HE SAID WE SHOWED 5000 FT, WE SWITCHED ENCODERS AND SHOWED LEVEL AT 4000 FT. NO CONFLICTS OR ANYTHING OCCURRED. WROTE MALFUNCTION UP IN MAINT DISCREPANCY LOG.
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.