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Medium large transport given descent clearance then turn vectors. Second aircraft turned and turned again. Aircraft 1 sights aircraft 2 below and passes clear.
| Attributes | |
| ACN | 211128 |
| Time | |
| Date | 199205 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zdc |
| State Reference | DC |
| Altitude | msl bound lower : 30000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 19000 flight time type : 500 |
| ASRS Report | 211128 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument 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 |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Center cleared us to descend from FL310 to FL240. The first officer selected vertical speed of -1000 FPM. Some time later, center gave us a vector to the right and asked us to 'expedite' our descent. He then gave a right turn vector to another aircraft followed by another more drastic and urgent vector to that aircraft. About that time, we observed the other aircraft at our 1130 O'clock position and just a bit lower than us. He passed about 2 mi to our left as we were both still in our turns. Apparently, center had cleared us to descend through his altitude then made corrections to avoid a conflict. No TCASII installed on our aircraft. This was not a near miss.
Original NASA ASRS Text
Title: MLG GIVEN DSCNT CLRNC THEN TURN VECTORS. SECOND ACFT TURNED AND TURNED AGAIN. ACFT 1 SIGHTS ACFT 2 BELOW AND PASSES CLR.
Narrative: CTR CLRED US TO DSND FROM FL310 TO FL240. THE FO SELECTED VERT SPD OF -1000 FPM. SOME TIME LATER, CTR GAVE US A VECTOR TO THE R AND ASKED US TO 'EXPEDITE' OUR DSCNT. HE THEN GAVE A R TURN VECTOR TO ANOTHER ACFT FOLLOWED BY ANOTHER MORE DRASTIC AND URGENT VECTOR TO THAT ACFT. ABOUT THAT TIME, WE OBSERVED THE OTHER ACFT AT OUR 1130 O'CLOCK POS AND JUST A BIT LOWER THAN US. HE PASSED ABOUT 2 MI TO OUR L AS WE WERE BOTH STILL IN OUR TURNS. APPARENTLY, CTR HAD CLRED US TO DSND THROUGH HIS ALT THEN MADE CORRECTIONS TO AVOID A CONFLICT. NO TCASII INSTALLED ON OUR ACFT. THIS WAS NOT A NEAR MISS.
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.