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Air carrier large transport altitude deviation. Flight crew claims cleared to 10000', ARTCC says altitude should have been 11000'.
| Attributes | |
| ACN | 142336 |
| Time | |
| Date | 199004 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 210 flight time total : 16000 flight time type : 10000 |
| ASRS Report | 142336 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation Pilot Deviation other |
Narrative:
Center (ATC) cleared our flight over bdf at FL240 to cross 45 DME southwest of ord at 10000'. Crew read back the instructions and set 10000' in the altitude alert. At approximately 50 DME southwest of ord approach control (we changed frequency after instructions to descend) asked our altitude. We replied 10350' descending. Approach control at that time stated, 'maintain 11000'.' we questioned the altitude and after some discussion agreed he may have given us 10000' instead of 11000'. We climbed during the discussion back to 11000'. He (the controller) stated no conflict. All of the 3 crew members agreed that the altitude given by the ATC was 10000' and the PNF read back 10000' on the readback and then set 10000' in the altitude alert. I feel this type of error can only be eliminated if all parties listen to readbacks.
Original NASA ASRS Text
Title: ACR LGT ALT DEVIATION. FLT CREW CLAIMS CLEARED TO 10000', ARTCC SAYS ALT SHOULD HAVE BEEN 11000'.
Narrative: CENTER (ATC) CLRED OUR FLT OVER BDF AT FL240 TO CROSS 45 DME SW OF ORD AT 10000'. CREW READ BACK THE INSTRUCTIONS AND SET 10000' IN THE ALT ALERT. AT APPROX 50 DME SW OF ORD APCH CTL (WE CHANGED FREQ AFTER INSTRUCTIONS TO DSND) ASKED OUR ALT. WE REPLIED 10350' DSNDING. APCH CTL AT THAT TIME STATED, 'MAINTAIN 11000'.' WE QUESTIONED THE ALT AND AFTER SOME DISCUSSION AGREED HE MAY HAVE GIVEN US 10000' INSTEAD OF 11000'. WE CLBED DURING THE DISCUSSION BACK TO 11000'. HE (THE CTLR) STATED NO CONFLICT. ALL OF THE 3 CREW MEMBERS AGREED THAT THE ALT GIVEN BY THE ATC WAS 10000' AND THE PNF READ BACK 10000' ON THE READBACK AND THEN SET 10000' IN THE ALT ALERT. I FEEL THIS TYPE OF ERROR CAN ONLY BE ELIMINATED IF ALL PARTIES LISTEN TO READBACKS.
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.