 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Air carrier X descent to occupied altitude on vector for approach had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 286558 |
| Time | |
| Date | 199410 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : msp |
| State Reference | MN |
| Altitude | msl bound lower : 4000 msl bound upper : 4300 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : msp tower : pns |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 190 flight time total : 9000 flight time type : 3000 |
| ASRS Report | 286558 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 9000 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X had been cleared ILS runway 29L. Glass cockpit and ILS was configured. Approach cleared us ILS runway 29R. Cockpit/frequencys reconfigured. We were cleared to 6000 ft. During the descent, we were cleared to 4000 ft. We were descending through 4500 ft MSL, approach called to strongly 'reassign' 5000 ft MSL. We pulled up, hitting 4300 ft MSL before climbing back to 5000 ft. Approach control called X as traffic to air carrier Y at 4000 ft on final to runway 29L. He called us visual with ceiling at 4700-4800 ft we saw him as we descended and lost him again when we climbed up to 5000 ft. Approach controller confused us and assigned us 4000 ft instead of 5000 ft -- or -- the runway 29L altitude instead of runway 29R altitude.
Original NASA ASRS Text
Title: ACR X DSCNT TO OCCUPIED ALT ON VECTOR FOR APCH HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: ACR X HAD BEEN CLRED ILS RWY 29L. GLASS COCKPIT AND ILS WAS CONFIGURED. APCH CLRED US ILS RWY 29R. COCKPIT/FREQS RECONFIGURED. WE WERE CLRED TO 6000 FT. DURING THE DSCNT, WE WERE CLRED TO 4000 FT. WE WERE DSNDING THROUGH 4500 FT MSL, APCH CALLED TO STRONGLY 'REASSIGN' 5000 FT MSL. WE PULLED UP, HITTING 4300 FT MSL BEFORE CLBING BACK TO 5000 FT. APCH CTL CALLED X AS TFC TO ACR Y AT 4000 FT ON FINAL TO RWY 29L. HE CALLED US VISUAL WITH CEILING AT 4700-4800 FT WE SAW HIM AS WE DSNDED AND LOST HIM AGAIN WHEN WE CLBED UP TO 5000 FT. APCH CTLR CONFUSED US AND ASSIGNED US 4000 FT INSTEAD OF 5000 FT -- OR -- THE RWY 29L ALT INSTEAD OF RWY 29R ALT.
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.