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B737 flight crew overrides automation to regain control of aircraft when encountering wake turbulence on downwind leg to lax.
| Attributes | |
| ACN | 511376 |
| Time | |
| Date | 200105 |
| Day | Sun |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : lax.airport |
| State Reference | CA |
| Altitude | msl single value : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tracon : sct.tracon artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : sct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 98 flight time total : 5600 flight time type : 700 |
| ASRS Report | 511376 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe inflight encounter : wake turbulence other anomaly other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended or assigned course flight crew : took precautionary avoidance action flight crew : overrode automation flight crew : regained aircraft control |
| Supplementary | |
| Problem Areas | Environmental Factor Aircraft |
| Primary Problem | Aircraft |
Narrative:
On right downwind runway 24R lax at 3500 ft, 190 KTS, flaps 2 degrees or 5 degrees, experienced a wake turbulence encounter. We were 7-8 mi intrail of a heavy jet and the aircraft began to roll +/-10 degrees left and right. Then the aircraft began a left roll. A 25 degrees left angle of bank, I disengaged the autoplt and autothrottle and began to input right aileron. The aircraft continued to roll left and I had to input fll right aileron to stop the left roll. The plane stopped at 40 degrees left angle of bank he waited there for a moment and then began to roll right again. We informed ATC and extended downwind to gain more separation. The passenger and flight attendants were all seated for landing at the time of the encounter and were not injured.
Original NASA ASRS Text
Title: B737 FLC OVERRIDES AUTOMATION TO REGAIN CTL OF ACFT WHEN ENCOUNTERING WAKE TURB ON DOWNWIND LEG TO LAX.
Narrative: ON R DOWNWIND RWY 24R LAX AT 3500 FT, 190 KTS, FLAPS 2 DEGS OR 5 DEGS, EXPERIENCED A WAKE TURB ENCOUNTER. WE WERE 7-8 MI INTRAIL OF A HVY JET AND THE ACFT BEGAN TO ROLL +/-10 DEGS L AND R. THEN THE ACFT BEGAN A L ROLL. A 25 DEGS L ANGLE OF BANK, I DISENGAGED THE AUTOPLT AND AUTOTHROTTLE AND BEGAN TO INPUT R AILERON. THE ACFT CONTINUED TO ROLL L AND I HAD TO INPUT FLL R AILERON TO STOP THE L ROLL. THE PLANE STOPPED AT 40 DEGS L ANGLE OF BANK HE WAITED THERE FOR A MOMENT AND THEN BEGAN TO ROLL R AGAIN. WE INFORMED ATC AND EXTENDED DOWNWIND TO GAIN MORE SEPARATION. THE PAX AND FLT ATTENDANTS WERE ALL SEATED FOR LNDG AT THE TIME OF THE ENCOUNTER AND WERE NOT INJURED.
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.