 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A320 encounters roll rate in wake turbulence of B757 that is too great for autoflt or manual control to counteract.
| Attributes | |
| ACN | 445500 |
| Time | |
| Date | 199907 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : trm.vortac |
| State Reference | CA |
| Altitude | msl single value : 36500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute airway : j78.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j78.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : atp |
| Experience | flight time total : 15000 |
| ASRS Report | 445500 |
| Events | |
| Anomaly | inflight encounter : wake turbulence other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control flight crew : exited adverse environment |
| Supplementary | |
| Problem Areas | Weather Aircraft Environmental Factor |
| Primary Problem | Environmental Factor |
Narrative:
En route sna-dtw, on climb out over southern california at FL365 for FL370, encountered 'washboard' type turbulence and aircraft began uncommanded left roll autoplt could not level wings or stop nose pitch-up. Aircraft then started rolling right at which point first officer disconnected autoplt and commanded left wing down with side-stick controller with no result. Control was regained when we departed 'washboard' turbulence. We had been following TCASII observed traffic 9 mi ahead of us along our route. ATC confirmed that preceding aircraft was at FL370 and a B757 type.
Original NASA ASRS Text
Title: A320 ENCOUNTERS ROLL RATE IN WAKE TURB OF B757 THAT IS TOO GREAT FOR AUTOFLT OR MANUAL CTL TO COUNTERACT.
Narrative: ENRTE SNA-DTW, ON CLBOUT OVER SOUTHERN CALIFORNIA AT FL365 FOR FL370, ENCOUNTERED 'WASHBOARD' TYPE TURB AND ACFT BEGAN UNCOMMANDED L ROLL AUTOPLT COULD NOT LEVEL WINGS OR STOP NOSE PITCH-UP. ACFT THEN STARTED ROLLING R AT WHICH POINT FO DISCONNECTED AUTOPLT AND COMMANDED L WING DOWN WITH SIDE-STICK CTLR WITH NO RESULT. CTL WAS REGAINED WHEN WE DEPARTED 'WASHBOARD' TURB. WE HAD BEEN FOLLOWING TCASII OBSERVED TFC 9 MI AHEAD OF US ALONG OUR RTE. ATC CONFIRMED THAT PRECEDING ACFT WAS AT FL370 AND A B757 TYPE.
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.