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Air carrier medium large transport didn't respond to ATC clearance in a timely manner and caused less than standard separation with small transport aircraft on vectors to airport.
| Attributes | |
| ACN | 256118 |
| Time | |
| Date | 199311 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : msp |
| State Reference | MN |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : msp |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 2 controller non radar : 3 controller radar : 8 |
| ASRS Report | 256118 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 10000 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Medium large transport X was on a right downwind. Medium large transport X was turned base leg at 4000 ft and instructed to descend to 3000 ft for runway 29L. Light transport Y was wbound at 4000 ft inbound to runway 29R. An advisory of the crossing traffic was issued to light transport Y. It appeared medium large transport X was not descending or turning. Medium large transport X was turned further west to stay ahead of light transport Y. A TA was reissued to light transport Y and the traffic was reported in sight. Medium large transport X reported the runway and both aircraft continued inbound without further incident. At the time medium large transport X was turned base, the 2 aircraft were separated by ample distance to allow the normal descent of 1000 ft by medium large transport X. It appeared medium large transport X was not turning or descending as instructed and lateral separation was lost quickly.
Original NASA ASRS Text
Title: ACR MLG DIDN'T RESPOND TO ATC CLRNC IN A TIMELY MANNER AND CAUSED LTSS WITH SMT ACFT ON VECTORS TO ARPT.
Narrative: MLG X WAS ON A R DOWNWIND. MLG X WAS TURNED BASE LEG AT 4000 FT AND INSTRUCTED TO DSND TO 3000 FT FOR RWY 29L. LTT Y WAS WBOUND AT 4000 FT INBOUND TO RWY 29R. AN ADVISORY OF THE XING TFC WAS ISSUED TO LTT Y. IT APPEARED MLG X WAS NOT DSNDING OR TURNING. MLG X WAS TURNED FURTHER W TO STAY AHEAD OF LTT Y. A TA WAS REISSUED TO LTT Y AND THE TFC WAS RPTED IN SIGHT. MLG X RPTED THE RWY AND BOTH ACFT CONTINUED INBOUND WITHOUT FURTHER INCIDENT. AT THE TIME MLG X WAS TURNED BASE, THE 2 ACFT WERE SEPARATED BY AMPLE DISTANCE TO ALLOW THE NORMAL DSCNT OF 1000 FT BY MLG X. IT APPEARED MLG X WAS NOT TURNING OR DSNDING AS INSTRUCTED AND LATERAL SEPARATION WAS LOST QUICKLY.
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.