SEA83LA169
1983-08-07 · GRANTS PASS, Oregon, United States · None · 1 aircraft · Status: Completed
Airport 3S8
Aircraft involved
Factual narrative
THE ACFT RAN OFF THE DEPARTURE END OF THE RWY DURING A FORCED LANDING FOLLOWING ENGINE FAILURE DURING A TOUCH AND GO LANDING. THE NOSEWHEEL STRUCK A MOUND OF DIRT AND THE ACFT NOSED OVER. THE ACFT HAD REACHED 40 FT AGL AND 70 MPH WHEN THE ENGINE LOST POWER FIRST BY RUNNING ROUGH AND THEN FAILING COMPLETELY. ENGINE TEARDOWN REVEALED THAT THE #1 CYLINDER EXHAUST VALVE STEM BROKE. A WORN VALVE STEM KEEPER SLEEVE ALLOWED THE VALVE AND STEM TO SLIDE INTO THE CYLINDER DURING AHIGH POWER APPLICATION. THE PISTON DISINTEGRATED WHEN THE VALVE WAS SWALLOWED. THE CFI TOOK OVER AND LANDED THE ACFT BUTWAS UNABLE TO STOP ON THE REMAINING RWY. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1983_SEA83LA169.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 (engine failure). All research papers
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- Semantic Scholar 2019 · Article (AIAA Scitech 2019 Forum) Impact of Engine Failure Constraints on the Initial Sizing of Hybrid-Electric GA Aircraft
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