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CRJ2 descending into msp encountered severe wake turbulence while 14 mi intrail to a B757 also descending into msp.
| Attributes | |
| ACN | 564773 |
| Time | |
| Date | 200211 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : fcm.vortac |
| State Reference | MN |
| Altitude | msl single value : 17000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : m98.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : sketr |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 200 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : sketr |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 14 flight time total : 150 |
| ASRS Report | 564773 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | inflight encounter : wake turbulence other anomaly |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to original clearance flight crew : regained aircraft control flight crew : exited adverse environment flight crew : became reoriented |
| Supplementary | |
| Problem Areas | Weather |
| Primary Problem | Weather |
Narrative:
Aircraft X was approximately 14 mi in front of aircraft Y, both inbound msp on the sketr 2 arrival. I switched aircraft X to msp approach. About 2 mins later, aircraft Y asked if there was any traffic in vicinity. I advised the pilot that no traffic was in his immediate area, and asked if he saw anything. The pilot advised he saw no traffic either visually or on TCASII, but had just encountered an uncommanded roll of 75 degrees to 90 degrees, direction not reported. I told him a B757 was ahead, and did a range bearing on the scope, which showed 13.5 mi -- the B757 was under approach, level, and probably slowing down. I figured in the area the incident occurred, the intrail was most likely more than 14.5. I asked if the pilot required any assistance. He replied negative. To my ears, it sounded like a very abrupt roll. We have been made aware of wake turbulence issues with the B757, but this is the first time I have heard of or had experience with this situation at the altitude and distance of this occurrence.
Original NASA ASRS Text
Title: CRJ2 DSNDING INTO MSP ENCOUNTERED SEVERE WAKE TURB WHILE 14 MI INTRAIL TO A B757 ALSO DSNDING INTO MSP.
Narrative: ACFT X WAS APPROX 14 MI IN FRONT OF ACFT Y, BOTH INBOUND MSP ON THE SKETR 2 ARR. I SWITCHED ACFT X TO MSP APCH. ABOUT 2 MINS LATER, ACFT Y ASKED IF THERE WAS ANY TFC IN VICINITY. I ADVISED THE PLT THAT NO TFC WAS IN HIS IMMEDIATE AREA, AND ASKED IF HE SAW ANYTHING. THE PLT ADVISED HE SAW NO TFC EITHER VISUALLY OR ON TCASII, BUT HAD JUST ENCOUNTERED AN UNCOMMANDED ROLL OF 75 DEGS TO 90 DEGS, DIRECTION NOT RPTED. I TOLD HIM A B757 WAS AHEAD, AND DID A RANGE BEARING ON THE SCOPE, WHICH SHOWED 13.5 MI -- THE B757 WAS UNDER APCH, LEVEL, AND PROBABLY SLOWING DOWN. I FIGURED IN THE AREA THE INCIDENT OCCURRED, THE INTRAIL WAS MOST LIKELY MORE THAN 14.5. I ASKED IF THE PLT REQUIRED ANY ASSISTANCE. HE REPLIED NEGATIVE. TO MY EARS, IT SOUNDED LIKE A VERY ABRUPT ROLL. WE HAVE BEEN MADE AWARE OF WAKE TURB ISSUES WITH THE B757, BUT THIS IS THE FIRST TIME I HAVE HEARD OF OR HAD EXPERIENCE WITH THIS SIT AT THE ALT AND DISTANCE OF THIS OCCURRENCE.
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.