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Flight crew of a B727 overshot descent altitude due to misunderstanding descent altitude and the ATC controller not correcting flight crew acknowledgement of the wrong altitude.
| Attributes | |
| ACN | 335750 |
| Time | |
| Date | 199605 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : msp |
| State Reference | MN |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : zmp |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : private pilot : instrument pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 230 flight time total : 14000 flight time type : 4000 |
| ASRS Report | 335750 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Error in readback of descent clearance on descent into msp. ATC apparently cleared us to 11000 ft at canen intersection. Crew understood and readback 10000 ft at canen intersection. ATC controller did not challenge or correct 10000 ft readback. After landing, msp ground relayed message to captain to call ZMP because of a possible conflict with an aircraft at 9000 ft. ATC later confirmed that the ATC controller did not catch the discrepancy in the original altitude assignment/readback response. Recommended corrective action -- change the meinz 7 arrival to expect descent to cross a designated arrival intersection at only one altitude, ie, either 11000 ft or 10000 ft, but not the possibility of both.
Original NASA ASRS Text
Title: FLC OF A B727 OVERSHOT DSCNT ALT DUE TO MISUNDERSTANDING DSCNT ALT AND THE ATC CTLR NOT CORRECTING FLC ACKNOWLEDGEMENT OF THE WRONG ALT.
Narrative: ERROR IN READBACK OF DSCNT CLRNC ON DSCNT INTO MSP. ATC APPARENTLY CLRED US TO 11000 FT AT CANEN INTXN. CREW UNDERSTOOD AND READBACK 10000 FT AT CANEN INTXN. ATC CTLR DID NOT CHALLENGE OR CORRECT 10000 FT READBACK. AFTER LNDG, MSP GND RELAYED MESSAGE TO CAPT TO CALL ZMP BECAUSE OF A POSSIBLE CONFLICT WITH AN ACFT AT 9000 FT. ATC LATER CONFIRMED THAT THE ATC CTLR DID NOT CATCH THE DISCREPANCY IN THE ORIGINAL ALT ASSIGNMENT/READBACK RESPONSE. RECOMMENDED CORRECTIVE ACTION -- CHANGE THE MEINZ 7 ARR TO EXPECT DSCNT TO CROSS A DESIGNATED ARR INTXN AT ONLY ONE ALT, IE, EITHER 11000 FT OR 10000 FT, BUT NOT THE POSSIBILITY OF BOTH.
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.