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B757-200 crew had a wake turbulence encounter with a heavy aircraft 8 mi ahead while on approach to ord.
| Attributes | |
| ACN | 608442 |
| Time | |
| Date | 200402 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ord.airport |
| State Reference | IL |
| Altitude | msl bound lower : 9000 msl bound upper : 9360 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| 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 descent : intermediate altitude |
| Route In Use | arrival star : jvl |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Flight Phase | descent : approach descent : intermediate altitude |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 100 flight time total : 7000 flight time type : 4000 |
| ASRS Report | 608442 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : wake turbulence inflight encounter : weather other anomaly other anomaly |
| Independent Detector | aircraft equipment other aircraft equipment : altimeter, ias attitude indicator other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : became reoriented flight crew : returned to assigned altitude flight crew : returned to intended or assigned course |
| Consequence | other |
| Miss Distance | horizontal : 48000 |
| Supplementary | |
| Problem Areas | Weather Environmental Factor Airspace Structure Aircraft |
| Primary Problem | Environmental Factor |
Narrative:
We had leveled off at 9000 ft and 250 KTS at krena intersection, then going direct ord. Suddenly, the aircraft (while on autoplt) went into a 30 degree bank turn to the left. I kicked off the autoplt, leveled the wings and the aircraft then went into a 30 degree bank to the right. During the bank, I attempted to level the wings, added power and initiated a climb. At 9360 ft, I leveled off and advised ATC that we had encountered heavy wake turbulence and had leveled off at 9360 ft, but were returning to 9000 ft at that time. Our speed had increased to 263 KTS of which ATC was advised. ATC told us that we had 8 mi on the heavy aircraft in front, but then proceeded to give us more spacing. The rest of the approach and landing was uneventful. I must say that the wake encounter felt very much like what we experience in training, and helped me identify the situation quickly.
Original NASA ASRS Text
Title: B757-200 CREW HAD A WAKE TURB ENCOUNTER WITH A HVY ACFT 8 MI AHEAD WHILE ON APCH TO ORD.
Narrative: WE HAD LEVELED OFF AT 9000 FT AND 250 KTS AT KRENA INTXN, THEN GOING DIRECT ORD. SUDDENLY, THE ACFT (WHILE ON AUTOPLT) WENT INTO A 30 DEG BANK TURN TO THE L. I KICKED OFF THE AUTOPLT, LEVELED THE WINGS AND THE ACFT THEN WENT INTO A 30 DEG BANK TO THE R. DURING THE BANK, I ATTEMPTED TO LEVEL THE WINGS, ADDED PWR AND INITIATED A CLB. AT 9360 FT, I LEVELED OFF AND ADVISED ATC THAT WE HAD ENCOUNTERED HVY WAKE TURB AND HAD LEVELED OFF AT 9360 FT, BUT WERE RETURNING TO 9000 FT AT THAT TIME. OUR SPD HAD INCREASED TO 263 KTS OF WHICH ATC WAS ADVISED. ATC TOLD US THAT WE HAD 8 MI ON THE HVY ACFT IN FRONT, BUT THEN PROCEEDED TO GIVE US MORE SPACING. THE REST OF THE APCH AND LNDG WAS UNEVENTFUL. I MUST SAY THAT THE WAKE ENCOUNTER FELT VERY MUCH LIKE WHAT WE EXPERIENCE IN TRAINING, AND HELPED ME IDENT THE SIT QUICKLY.
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.