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Wake turbulence encounter created by a B757 forces an LR35 PIC to climb back towards his last assigned altitude 6 NM from mdw, il.
| Attributes | |
| ACN | 544869 |
| Time | |
| Date | 200204 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mdw.airport |
| State Reference | IL |
| Altitude | msl bound lower : 3300 msl bound upper : 3600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | approach : circling |
| 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 |
| Route In Use | approach : circling |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 70 flight time total : 14000 flight time type : 7000 |
| ASRS Report | 544869 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : wake turbulence non adherence : clearance non adherence : required legal separation other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued advisory flight crew : exited adverse environment flight crew : regained aircraft control flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew Other |
| Supplementary | |
| Problem Areas | Environmental Factor Flight Crew Human Performance Airspace Structure ATC Human Performance Aircraft |
| Primary Problem | Airspace Structure |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On approach to runway 31C with a circle to runway 22L, behind a heavy B757, encountered turbulence at 3300 ft. I was cleared from 4000 ft to 3000 ft. When I encountered the turbulence I climbed to 3600 ft to avoid the wake turbulence from the B757. Approach told me I could not climb. I advised approach I was trying to avoid wake turbulence. They told me the boeing was not a factor. However, they were not sitting in my seat. No other traffic was involved. I felt I was protected between 4000 ft and 3000 ft.
Original NASA ASRS Text
Title: WAKE TURB ENCOUNTER CREATED BY A B757 FORCES AN LR35 PIC TO CLB BACK TOWARDS HIS LAST ASSIGNED ALT 6 NM FROM MDW, IL.
Narrative: ON APCH TO RWY 31C WITH A CIRCLE TO RWY 22L, BEHIND A HVY B757, ENCOUNTERED TURB AT 3300 FT. I WAS CLRED FROM 4000 FT TO 3000 FT. WHEN I ENCOUNTERED THE TURB I CLBED TO 3600 FT TO AVOID THE WAKE TURB FROM THE B757. APCH TOLD ME I COULD NOT CLB. I ADVISED APCH I WAS TRYING TO AVOID WAKE TURB. THEY TOLD ME THE BOEING WAS NOT A FACTOR. HOWEVER, THEY WERE NOT SITTING IN MY SEAT. NO OTHER TFC WAS INVOLVED. I FELT I WAS PROTECTED BTWN 4000 FT AND 3000 FT.
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.