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A B737 encounters wake turbulence several times during arrival in trail of a B767 beginning at FL240 and ending at 4000 ft.
| Attributes | |
| ACN | 820992 |
| Time | |
| Date | 200901 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ORD.Airport |
| State Reference | IL |
| Aircraft 1 | |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR WATSN |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B767 Undifferentiated or Other Model |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 40 Flight Crew Total 7000 Flight Crew Type 3000 |
| Events | |
| Anomaly | Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
Flight to ord; on the watsn 1 arrival; we encountered wake turbulence on three occasions. We were just outside haupo at FL240. The winds aloft were on the nose at 85 KTS. The jet rolled up to 25 degrees left and right and the first officer disconnected the autopilot and flew manually. We did not diverge from altitude. I asked what type of aircraft we were following and was told by ATC that we were following a B757. On the approach we touch the turbulence again and also on final. I requested that we were going to displace right of course on the localizer for runway 27L. I asked if we could side step to runway 27R but were told that we would have to go around and re-enter the pattern. We decided to continue the approach. I asked what type of aircraft and the final controller stated that it was a heavy B767.callback conversation with reporter revealed the following information: the reporter states that they were in trail of the preceding aircraft approximately 20 miles. The second incident was at about 12000 ft and the one on final occurred around 4000 ft. During the final approach they elected to offset from the localizer upwind and flew the glide slope one dot high. The same aircraft was followed throughout the arrival. It was reported erroneously to be a B757 initially and corrected to a B767 during approach.
Original NASA ASRS Text
Title: A B737 encounters wake turbulence several times during arrival in trail of a B767 beginning at FL240 and ending at 4000 ft.
Narrative: Flight to ORD; on the WATSN 1 arrival; we encountered wake turbulence on three occasions. We were just outside HAUPO at FL240. The winds aloft were on the nose at 85 KTS. The jet rolled up to 25 degrees left and right and the First Officer disconnected the autopilot and flew manually. We did not diverge from altitude. I asked what type of aircraft we were following and was told by ATC that we were following a B757. On the approach we touch the turbulence again and also on final. I requested that we were going to displace right of course on the localizer for Runway 27L. I asked if we could side step to Runway 27R but were told that we would have to go around and re-enter the pattern. We decided to continue the approach. I asked what type of aircraft and the final controller stated that it was a heavy B767.Callback conversation with reporter revealed the following information: The reporter states that they were in trail of the preceding aircraft approximately 20 miles. The second incident was at about 12000 FT and the one on final occurred around 4000 FT. During the final approach they elected to offset from the localizer upwind and flew the glide slope one dot high. The same aircraft was followed throughout the arrival. It was reported erroneously to be a B757 initially and corrected to a B767 during approach.
Data retrieved from NASA's ASRS site as of April 2012 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.