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A corporate jet encountered wake turbulence on arrival to ads five miles in trail of a B747. The encounter resulted in a violent roll to the left.
| Attributes | |
| ACN | 960152 |
| Time | |
| Date | 201107 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | D10.TRACON |
| State Reference | TX |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citation Excel (C560XL) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Route In Use | STAR JEN9 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Flight Engineer Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 149 Flight Crew Total 11208 Flight Crew Type 4873 |
| Events | |
| Anomaly | Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
We were approaching delmo intersection on the jen.JEN9 arrival to ads airport. About 1 mile before reaching delmo we began slowing from 250 KTS to the published speed of 210 KTS that is required over delmo and at the same time; ATC advised that we were 5 miles behind a B747 and issued a clearance to descend to 5;000 ft. I slowed down immediately to increase the separation as much as I could possibly do; but when we rolled wings level on the northerly heading after passing delmo; we immediately encountered the wake of the B747. We rolled to the right and then violently rolled to the left. I immediately applied power to arrest the descent and climb back up to 6;000 ft. At 6;000 ft we were out if it. ATC gave us a vector to the east while the B747 continued its northerly track and then I resumed the descent to the east. Flight continued without incident. Contributing factors - I should have not accepted the descent after learning we were trailing a heavy aircraft so closely; and the controller should have not issued one nor continued us on a course directly into the wake of a heavy aircraft.
Original NASA ASRS Text
Title: A corporate jet encountered wake turbulence on arrival to ADS five miles in trail of a B747. The encounter resulted in a violent roll to the left.
Narrative: We were approaching DELMO Intersection on the JEN.JEN9 arrival to ADS airport. About 1 mile before reaching DELMO we began slowing from 250 KTS to the published speed of 210 KTS that is required over DELMO and at the same time; ATC advised that we were 5 miles behind a B747 and issued a clearance to descend to 5;000 FT. I slowed down IMMEDIATELY to increase the separation as much as I could possibly do; but when we rolled wings level on the northerly heading after passing DELMO; we immediately encountered the wake of the B747. We rolled to the right and then violently rolled to the left. I immediately applied power to arrest the descent and climb back up to 6;000 FT. At 6;000 FT we were out if it. ATC gave us a vector to the east while the B747 continued its northerly track and then I resumed the descent to the east. Flight continued without incident. Contributing factors - I should have not accepted the descent after learning we were trailing a heavy aircraft so closely; and the Controller should have not issued one nor continued us on a course directly into the wake of a heavy aircraft.
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.