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A DHC8-400 approaching sea runway 16L on a visual approach; encountered wake turbulence from an aircraft on runway 16C and deviated IMC off the localizer course.
| Attributes | |
| ACN | 749672 |
| Time | |
| Date | 200708 |
| Place | |
| Locale Reference | airport : sea.airport |
| State Reference | WA |
| Altitude | msl single value : 2500 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : s46.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8-400 |
| 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 : cfi pilot : atp |
| Experience | flight time last 90 days : 128 flight time total : 6853 flight time type : 100 |
| ASRS Report | 749672 |
| Events | |
| Anomaly | inflight encounter : wake turbulence |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : exited adverse environment |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Environmental Factor ATC Human Performance Airport Weather |
| Primary Problem | Ambiguous |
Narrative:
While on a visual approach to sea runway 16L; we encountered a wake from the aircraft landing on runway 16C. With another aircraft landing on runway 16C on our right; we were forced to deviate to the left of the runway 16L localizer and fly through a cloud. We lost sight of the aircraft that we were supposed to follow momentarily. No other irregularities occurred. It was very busy in sea and we accepted a visual approach when conditions may not have been warranted. We were the second of several aircraft that accepted a visual approach during a short period. Although it was against the rules; I made the decision to go IMC in the interest of safety. By the time I had the chance to tell ATC; we were VMC again.
Original NASA ASRS Text
Title: A DHC8-400 APCHING SEA RWY 16L ON A VISUAL APCH; ENCOUNTERED WAKE TURB FROM AN ACFT ON RWY 16C AND DEVIATED IMC OFF THE LOC COURSE.
Narrative: WHILE ON A VISUAL APCH TO SEA RWY 16L; WE ENCOUNTERED A WAKE FROM THE ACFT LNDG ON RWY 16C. WITH ANOTHER ACFT LNDG ON RWY 16C ON OUR R; WE WERE FORCED TO DEVIATE TO THE L OF THE RWY 16L LOC AND FLY THROUGH A CLOUD. WE LOST SIGHT OF THE ACFT THAT WE WERE SUPPOSED TO FOLLOW MOMENTARILY. NO OTHER IRREGULARITIES OCCURRED. IT WAS VERY BUSY IN SEA AND WE ACCEPTED A VISUAL APCH WHEN CONDITIONS MAY NOT HAVE BEEN WARRANTED. WE WERE THE SECOND OF SEVERAL ACFT THAT ACCEPTED A VISUAL APCH DURING A SHORT PERIOD. ALTHOUGH IT WAS AGAINST THE RULES; I MADE THE DECISION TO GO IMC IN THE INTEREST OF SAFETY. BY THE TIME I HAD THE CHANCE TO TELL ATC; WE WERE VMC AGAIN.
Data retrieved from NASA's ASRS site as of January 2009 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.