SEA89LA178
1989-09-26 · PORTLAND, Oregon, United States · Serious · 1 aircraft · Status: Completed
Airport PDX
Aircraft involved
Probable cause & findings
THE PILOT'S POOR INFLIGHT PLANNING. CONTRIBUTING TO THE ACCIDENT WAS THE WAKE TURBULENCE AND REMEDIAL ACTION NOT POSSIBLE.
Factual narrative
AT THE END OF A CROSS COUNTRY FLIGHT, APPROACHING THE AIRPORT, THE PILOT WAS CLEARED TO LAND AND CAUTIONED OF WAKE TURBULENCE FROM A LARGE AIRPLANE LANDING AHEAD OF THE ACCIDENT AIRPLANE. THE PILOT WAS INSTRUCTED TO KEEP A TIGHT PATTERN AND FOLLOW THE LARGE AIRPLANE. WHILE ON SHORT FINAL THE ACCIDENT AIRPLANE ENCOUNTERED THE WAKE TURBULENCE OF THE LARGE AIRPLANE. THE PILOT WAS UNABLE TO MAINTAIN CONTROL AND COLLIDED WITH THE TERRAIN SHORT OF THE RUNWAY. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1989_SEA89LA178.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
Matched on aircraft type or causal vocabulary (wake turbulence, turbulence). All research papers
- NASA NTRS 2019 · Conference Paper Aircraft wake turbulence minimization by aerodynamic means
The paper reviews NASA's efforts on wake vortex turbulence minimization by aerodynamic design or retrofit modifications to large transport aircraft.
- NASA NTRS 2019 · Conference Paper Wake Turbulence Mitigation for Arrivals (WTMA)
The preliminary Wake Turbulence Mitigation for Arrivals (WTMA) concept of operations is described in this paper. The WTMA concept provides further detail to work initiated by the Wake Vortex Avoidance…
- NASA NTRS 2019 · Conference Paper Aircraft wake turbulence avoidance
Aircraft wake turbulence /trailing vortex systems/ avoidance during flight, describing procedures for pilots and tower operators
- NASA NTRS 2019 · Conference Paper Aircraft wake turbulence progress and plans
Aircraft wake turbulence and trailing vortices, investigating physical characteristics, hazard potential and avoidance techniques
- SKYbrary (Eurocontrol) 2023 · SKYbrary article Wake Vortex Turbulence — SKYbrary Knowledge Base
SKYbrary wake vortex turbulence comprehensive article — generation mechanics, dissipation factors, separation standards (ICAO LIGHT/MEDIUM/HEAVY/SUPER + recategorisation RECAT-EU).
- NASA NTRS 2019 · Contractor Report (CR) An Examination of Aviation Accidents Associated with Turbulence, Wind Shear and Thunderstorm
The focal point of the study reported here was the definition and examination of turbulence, wind shear and thunderstorm in relation to aviation accidents.