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B737 first officer reported encountering wake vortex in trail of a B747 on approach at ord that caused uncommanded roll.
| Attributes | |
| ACN | 1102051 |
| Time | |
| Date | 201306 |
| Place | |
| Locale Reference | ORD.Airport |
| State Reference | IL |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 8500 Flight Crew Type 500 |
| Events | |
| Anomaly | Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
Joining the localizer at ord we encountered wake turbulence from a B747 ahead of us. The turbulence was surprising because it put our aircraft into a bank one direction; we recovered; then the other (probably the other wake trail.) very little altitude was gained or lost. We felt this was probably pretty surprising to the passengers as it had been a very smooth ride up to that point. The captain decided to make an announcement explaining this to the passengers. The heavy was more than 5 miles ahead of us but we didn't have it in sight. Must have been some strange wind patterns or the heavy was high joining or something for us to encounter this because we were pretty much on the localizer and glideslope joining. The rest of the approach we came in a half dot high and didn't encounter anymore of the wake.
Original NASA ASRS Text
Title: B737 First Officer reported encountering wake vortex in trail of a B747 on approach at ORD that caused uncommanded roll.
Narrative: Joining the localizer at ORD we encountered wake turbulence from a B747 ahead of us. The turbulence was surprising because it put our aircraft into a bank one direction; we recovered; then the other (probably the other wake trail.) Very little altitude was gained or lost. We felt this was probably pretty surprising to the passengers as it had been a very smooth ride up to that point. The Captain decided to make an announcement explaining this to the passengers. The heavy was more than 5 miles ahead of us but we didn't have it in sight. Must have been some strange wind patterns or the heavy was high joining or something for us to encounter this because we were pretty much on the localizer and glideslope joining. The rest of the approach we came in a half dot high and didn't encounter anymore of the wake.
Data retrieved from NASA's ASRS site as of July 2013 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.