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B737 flight crew issued go around during approach to mdw after their flight encounters wake turbulence from the preceding B757 on approach to runway 31C and is slowed prematurely.
| Attributes | |
| ACN | 554765 |
| Time | |
| Date | 200207 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mdw.airport |
| State Reference | IL |
| Altitude | agl single value : 6 msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon tower : mdw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 31c other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : mdw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 125 flight time total : 11500 flight time type : 3500 |
| ASRS Report | 554765 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | inflight encounter : wake turbulence non adherence : published procedure non adherence : required legal separation non adherence : clearance other anomaly |
| Independent Detector | other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : executed missed approach |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Weather Flight Crew Human Performance Airspace Structure |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On ILS runway 31C at mdw, 180 KTS assigned. After encountering wake from a B757 in front of us, we slowed. Frequency too busy to advise approach control. Switched to mdw tower. Tower issued 90 degree turn, told us to return to approach control. Approach said we slowed too early. Chicago approach needs to utilize a bottom line 60 second in-trail rule.
Original NASA ASRS Text
Title: B737 FLC ISSUED GAR DURING APCH TO MDW AFTER THEIR FLT ENCOUNTERS WAKE TURB FROM THE PRECEDING B757 ON APCH TO RWY 31C AND IS SLOWED PREMATURELY.
Narrative: ON ILS RWY 31C AT MDW, 180 KTS ASSIGNED. AFTER ENCOUNTERING WAKE FROM A B757 IN FRONT OF US, WE SLOWED. FREQ TOO BUSY TO ADVISE APCH CTL. SWITCHED TO MDW TWR. TWR ISSUED 90 DEG TURN, TOLD US TO RETURN TO APCH CTL. APCH SAID WE SLOWED TOO EARLY. CHICAGO APCH NEEDS TO UTILIZE A BOTTOM LINE 60 SECOND IN-TRAIL RULE.
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.