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Captain of an MD83 temporarily lost aircraft control when going through the wake turbulence of a previously landed B777 at 30 ft above touchdown.
| Attributes | |
| ACN | 446389 |
| Time | |
| Date | 199908 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sea.airport |
| State Reference | WA |
| Altitude | agl single value : 30 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : sea.tower |
| Operator | common carrier : air carrier |
| Make Model Name | MD-83 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tower : sea.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | landing : roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 10000 flight time type : 3500 |
| ASRS Report | 446389 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | inflight encounter : turbulence inflight encounter other non adherence : required legal separation other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control |
| Consequence | Other |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
While on a visual approach to runway 34R at sea we were told a truck was on the runway expect landing clearance on short final. While turning final we were asked to call visual on a B777 but, we could not see the B777 and did not report it. The tower on a 4 mi final switch our runway to land behind the B777 on runway 34L. While 30 ft above the runway we flew into the B777 wake turbulence. We were able to execute an escape and land. I believe the B777 wing produces a large amount of wake turbulence and the sea tower did not give us the legal distance from the B777.
Original NASA ASRS Text
Title: CAPT OF AN MD83 TEMPORARILY LOST ACFT CTL WHEN GOING THROUGH THE WAKE TURB OF A PREVIOUSLY LANDED B777 AT 30 FT ABOVE TOUCHDOWN.
Narrative: WHILE ON A VISUAL APCH TO RWY 34R AT SEA WE WERE TOLD A TRUCK WAS ON THE RWY EXPECT LNDG CLRNC ON SHORT FINAL. WHILE TURNING FINAL WE WERE ASKED TO CALL VISUAL ON A B777 BUT, WE COULD NOT SEE THE B777 AND DID NOT RPT IT. THE TWR ON A 4 MI FINAL SWITCH OUR RWY TO LAND BEHIND THE B777 ON RWY 34L. WHILE 30 FT ABOVE THE RWY WE FLEW INTO THE B777 WAKE TURB. WE WERE ABLE TO EXECUTE AN ESCAPE AND LAND. I BELIEVE THE B777 WING PRODUCES A LARGE AMOUNT OF WAKE TURB AND THE SEA TWR DID NOT GIVE US THE LEGAL DISTANCE FROM THE B777.
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.