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B737-300 involuntary rolled to 40 degrees during cruise at FL280 which had to be corrected manually with aileron after autoplt disconnected. There was no control malfunction indicated. Flight crew suspected wake turbulence from a B747 15 mi ahead.
| Attributes | |
| ACN | 542304 |
| Time | |
| Date | 200203 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : fnt.vortac |
| State Reference | MI |
| Altitude | msl single value : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 6000 |
| ASRS Report | 542304 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | inflight encounter : wake turbulence other anomaly |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : regained aircraft control other |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance Environmental Factor |
| Primary Problem | Environmental Factor |
Narrative:
At cruise with autoplt on, we experienced a rolling motion that had to be manually corrected with aileron control. Aircraft bank reached 40 degrees. Suspect a B747 15 mi ahead created wake turbulence that caused the rolling motion. No control malfunction indicated. No injuries. Maintenance notified, debriefed and a write-up entered in the logbook.
Original NASA ASRS Text
Title: B737-300 INVOLUNTARY ROLLED TO 40 DEGS DURING CRUISE AT FL280 WHICH HAD TO BE CORRECTED MANUALLY WITH AILERON AFTER AUTOPLT DISCONNECTED. THERE WAS NO CTL MALFUNCTION INDICATED. FLC SUSPECTED WAKE TURB FROM A B747 15 MI AHEAD.
Narrative: AT CRUISE WITH AUTOPLT ON, WE EXPERIENCED A ROLLING MOTION THAT HAD TO BE MANUALLY CORRECTED WITH AILERON CTL. ACFT BANK REACHED 40 DEGS. SUSPECT A B747 15 MI AHEAD CREATED WAKE TURB THAT CAUSED THE ROLLING MOTION. NO CTL MALFUNCTION INDICATED. NO INJURIES. MAINT NOTIFIED, DEBRIEFED AND A WRITE-UP ENTERED IN THE LOGBOOK.
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.