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A B737-300 flight crew is descended towards another aircraft during an altitude change while under control of ZDC, dc.
| Attributes | |
| ACN | 471834 |
| Time | |
| Date | 200005 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | intersection : zizzi |
| State Reference | NJ |
| Altitude | msl bound lower : 34000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 250 flight time total : 16000 flight time type : 4000 |
| ASRS Report | 471834 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment : tcas |
| Resolutory Action | flight crew : took precautionary avoidance action |
| Consequence | Other |
| Miss Distance | horizontal : 15000 vertical : 1000 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
At approximately 60 NM north of zizzi intersection, flight was directed to turn 10 degrees left for traffic and to descend from FL350 to FL310. Descending through FL342, we received a TCASII TA. PF engaged altitude hold and the aircraft leveled off between FL339 and FL340. ATC controller had descended us and turned us into another aircraft's path cruising at FL330.
Original NASA ASRS Text
Title: A B737-300 FLC IS DSNDED TOWARDS ANOTHER ACFT DURING AN ALT CHANGE WHILE UNDER CTL OF ZDC, DC.
Narrative: AT APPROX 60 NM N OF ZIZZI INTXN, FLT WAS DIRECTED TO TURN 10 DEGS L FOR TFC AND TO DSND FROM FL350 TO FL310. DSNDING THROUGH FL342, WE RECEIVED A TCASII TA. PF ENGAGED ALT HOLD AND THE ACFT LEVELED OFF BTWN FL339 AND FL340. ATC CTLR HAD DSNDED US AND TURNED US INTO ANOTHER ACFT'S PATH CRUISING AT FL330.
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.