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Aircraft X, a B737, encountered wake turbulence following aircraft Y, B572, even though the distance between aircraft exceeded the requirement by the FAA.
| Attributes | |
| ACN | 429568 |
| Time | |
| Date | 199902 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ord.airport |
| State Reference | IL |
| Altitude | msl bound lower : 7000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 8 controller radar : 17 controller time certified in position1 : 18 |
| ASRS Report | 429568 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | inflight encounter : wake turbulence non adherence other other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | ATC Human Performance Weather Aircraft |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
Both aircraft entered our airspace from the northeast at 10000 ft 10 mi in trail. First the B757 (aircraft Y) was descended to 7000 ft, 10 mi northeast of ord and turned to a 250 degree heading for a downwind to runway 9R. At approximately the same position, I descended the B737 (aircraft X) to 7000 ft, 8 mi northeast of ord. The B737 asked what they were following and that they just hit turbulence and rolled 30 degrees. At this time the B757 was 7.9 mi ahead of the B737, level at 7000 ft. On the radar plot, the B737 was 1 1/2 mi east of the B757's track. The winds were light out of the northwest at altitude.
Original NASA ASRS Text
Title: ACFT X, A B737, ENCOUNTERED WAKE TURB FOLLOWING ACFT Y, B572, EVEN THOUGH THE DISTANCE BTWN ACFT EXCEEDED THE REQUIREMENT BY THE FAA.
Narrative: BOTH ACFT ENTERED OUR AIRSPACE FROM THE NE AT 10000 FT 10 MI IN TRAIL. FIRST THE B757 (ACFT Y) WAS DSNDED TO 7000 FT, 10 MI NE OF ORD AND TURNED TO A 250 DEG HDG FOR A DOWNWIND TO RWY 9R. AT APPROX THE SAME POS, I DSNDED THE B737 (ACFT X) TO 7000 FT, 8 MI NE OF ORD. THE B737 ASKED WHAT THEY WERE FOLLOWING AND THAT THEY JUST HIT TURB AND ROLLED 30 DEGS. AT THIS TIME THE B757 WAS 7.9 MI AHEAD OF THE B737, LEVEL AT 7000 FT. ON THE RADAR PLOT, THE B737 WAS 1 1/2 MI E OF THE B757'S TRACK. THE WINDS WERE LIGHT OUT OF THE NW AT ALT.
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.