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Air carrier flight crew misunderstood altitude clearance and read back wrong altitude. Readback hearback. Altitude deviation altitude overshot.
| Attributes | |
| ACN | 315920 |
| Time | |
| Date | 199509 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pdz airport : ont |
| State Reference | CA |
| Altitude | msl bound lower : 7000 msl bound upper : 7700 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ont |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial climbout : intermediate altitude |
| Route In Use | departure other departure sid : sid enroute airway : ont |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 14000 |
| ASRS Report | 315920 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time total : 6000 |
| ASRS Report | 315890 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : published procedure other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 30000 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On the prado departure out of ont, established on the 130 degree radial from 112.2, climbing through 7600 ft to 10000 ft, center told us we were cleared to 7000 ft, asked us to level at 8000 ft. We had reported to approach control that we were climbing to 10000 ft and they did not correct us until we were at 7600 ft. Traffic was 7500 ft, 5 mi, no conflict, had it in sight. We wrote down 10000 ft and repeated 10000 ft to controller. Called controller on phone, she said no problem. She didn't catch the 10000 ft call.
Original NASA ASRS Text
Title: ACR FLC MISUNDERSTOOD ALT CLRNC AND READ BACK WRONG ALT. READBACK HEARBACK. ALTDEV ALT OVERSHOT.
Narrative: ON THE PRADO DEP OUT OF ONT, ESTABLISHED ON THE 130 DEG RADIAL FROM 112.2, CLBING THROUGH 7600 FT TO 10000 FT, CTR TOLD US WE WERE CLRED TO 7000 FT, ASKED US TO LEVEL AT 8000 FT. WE HAD RPTED TO APCH CTL THAT WE WERE CLBING TO 10000 FT AND THEY DID NOT CORRECT US UNTIL WE WERE AT 7600 FT. TFC WAS 7500 FT, 5 MI, NO CONFLICT, HAD IT IN SIGHT. WE WROTE DOWN 10000 FT AND REPEATED 10000 FT TO CTLR. CALLED CTLR ON PHONE, SHE SAID NO PROB. SHE DIDN'T CATCH THE 10000 FT CALL.
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.