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Air carrier-medium large transport overtakes another air carrier-medium large transport at cruise altitude resulting in less than standard separation.
| Attributes | |
| ACN | 99625 |
| Time | |
| Date | 198812 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : jhw |
| State Reference | NY |
| Altitude | msl bound lower : 31300 msl bound upper : 33000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : j29 enroute airway : j554 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 99625 |
| 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 |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance none taken : insufficient time other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 28200 vertical : 1700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Medium large transport X and medium large transport Y were on J554 eastbound to jhw at FL330 8 mi in trail showing the same ground speed on the radar. When medium large transport X turned northeast bound on J29 his ground speed decreased considerably and despite turning and descending medium large transport Y I lost minimum sep of 5 mi and 2000'. En-tap showed 4.7 mi and 1700'.
Original NASA ASRS Text
Title: ACR-MLG OVERTAKES ANOTHER ACR-MLG AT CRUISE ALT RESULTING IN LESS THAN STANDARD SEPARATION.
Narrative: MLG X AND MLG Y WERE ON J554 EBND TO JHW AT FL330 8 MI IN TRAIL SHOWING THE SAME GND SPD ON THE RADAR. WHEN MLG X TURNED NE BOUND ON J29 HIS GND SPD DECREASED CONSIDERABLY AND DESPITE TURNING AND DSNDING MLG Y I LOST MINIMUM SEP OF 5 MI AND 2000'. EN-TAP SHOWED 4.7 MI AND 1700'.
Data retrieved from NASA's ASRS site as of August 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.