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Operational error less than standard separation between a B727 and a B73S when the B727 was given a descent to the same assigned altitude as the B73S.
| Attributes | |
| ACN | 382853 |
| Time | |
| Date | 199710 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : iow |
| State Reference | IA |
| Altitude | msl bound lower : 33000 msl bound upper : 35000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tower : sat |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 4 |
| ASRS Report | 382853 |
| 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 non adherence : published procedure |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 1300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
B73S eastbound FL330 issued direct djb. B727 checked on nwbound at FL350. Due to flow restr B727 was issued descent to FL330 without sufficient traffic search. B727 transferred to another sector. When possible loss of separation became apparent B73S was turned and issued descent. Loss of separation occurred. A better traffic search would have prevented the error.
Original NASA ASRS Text
Title: OPERROR LTSS BTWN A B727 AND A B73S WHEN THE B727 WAS GIVEN A DSCNT TO THE SAME ASSIGNED ALT AS THE B73S.
Narrative: B73S EBOUND FL330 ISSUED DIRECT DJB. B727 CHKED ON NWBOUND AT FL350. DUE TO FLOW RESTR B727 WAS ISSUED DSCNT TO FL330 WITHOUT SUFFICIENT TFC SEARCH. B727 TRANSFERRED TO ANOTHER SECTOR. WHEN POSSIBLE LOSS OF SEPARATION BECAME APPARENT B73S WAS TURNED AND ISSUED DSCNT. LOSS OF SEPARATION OCCURRED. A BETTER TFC SEARCH WOULD HAVE PREVENTED THE ERROR.
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.