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DC9-50 flight crew challenged by czyz controller on altitude readout. Transponders recycled and problem corrected.
| Attributes | |
| ACN | 461770 |
| Time | |
| Date | 200001 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : cyyz.airport |
| State Reference | ON |
| Altitude | msl bound lower : 7080 msl bound upper : 7500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 50 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : vacating altitude climbout : intermediate altitude cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 90 flight time total : 10000 flight time type : 2000 |
| ASRS Report | 461770 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | aircraft : equipment problem dissipated controller : issued advisory flight crew : overcame equipment problem |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
During climb out of yyz, cleared to 7000 ft (altimeter set correctly). Departure called to say readout they had showed 7500 ft (after clearance to FL230). Our altimeters showed about 7080 ft and we reported that. No aircraft conflicts involved. We went to transponder #2 (no readout) back to transponder #1 and checked with next controller and showed 15000 ft correctly and at FL350. We have no idea why the difference.
Original NASA ASRS Text
Title: DC9-50 FLC CHALLENGED BY CZYZ CTLR ON ALT READOUT. TRANSPONDERS RECYCLED AND PROB CORRECTED.
Narrative: DURING CLBOUT OF YYZ, CLRED TO 7000 FT (ALTIMETER SET CORRECTLY). DEP CALLED TO SAY READOUT THEY HAD SHOWED 7500 FT (AFTER CLRNC TO FL230). OUR ALTIMETERS SHOWED ABOUT 7080 FT AND WE RPTED THAT. NO ACFT CONFLICTS INVOLVED. WE WENT TO XPONDER #2 (NO READOUT) BACK TO XPONDER #1 AND CHKED WITH NEXT CTLR AND SHOWED 15000 FT CORRECTLY AND AT FL350. WE HAVE NO IDEA WHY THE DIFFERENCE.
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.