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ARTCC controller mistakenly turned 1 of 2 descending aircraft the wrong way for separation resulting in loss of legal separation.
| Attributes | |
| ACN | 497373 |
| Time | |
| Date | 200101 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : hto.vortac |
| State Reference | NY |
| Altitude | msl bound lower : 31000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A330 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 16 |
| ASRS Report | 497373 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Resolutory Action | none taken : detected after the fact none taken : anomaly accepted |
| Miss Distance | horizontal : 21300 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #2 was cleared via NAVAID radial to intercept airway south of course. Descending aircraft #1 on course to parallel aircraft #2 to accommodate descent. Aircraft #1 was given descent clearance from FL370 to FL310. Aircraft #2 was observed not on radial vector and converging with aircraft #1. Aircraft #2 was turned 30 degrees left of course to maintain separation. Aircraft #1 was mistakenly turned 30 degrees left in error -- should have been 30 degrees right to maintain separation.
Original NASA ASRS Text
Title: ARTCC CTLR MISTAKENLY TURNED 1 OF 2 DSNDING ACFT THE WRONG WAY FOR SEPARATION RESULTING IN LOSS OF LEGAL SEPARATION.
Narrative: ACFT #2 WAS CLRED VIA NAVAID RADIAL TO INTERCEPT AIRWAY S OF COURSE. DSNDING ACFT #1 ON COURSE TO PARALLEL ACFT #2 TO ACCOMMODATE DSCNT. ACFT #1 WAS GIVEN DSCNT CLRNC FROM FL370 TO FL310. ACFT #2 WAS OBSERVED NOT ON RADIAL VECTOR AND CONVERGING WITH ACFT #1. ACFT #2 WAS TURNED 30 DEGS L OF COURSE TO MAINTAIN SEPARATION. ACFT #1 WAS MISTAKENLY TURNED 30 DEGS L IN ERROR -- SHOULD HAVE BEEN 30 DEGS R TO MAINTAIN SEPARATION.
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.