SEA92LA156 · THOMSEN, Horst ROTORWAY "EXEC" ROTORWAY "
THOMSEN, Horst ROTORWAY "EXEC" ROTORWAY " · Accident: in flight collision with object on approach
Event
- NTSB case
- SEA92LA156
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- 0
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
THOMSEN, Horst ROTORWAY "EXEC" ROTORWAY "
- Aircraft type
- Thomsen Horst ROTORWAY EXEC
- Category
- Helicopter
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- UNREG
- Operator
- Thomsen, Horst · private individual
- Onboard fatalities
- Unknown
- Route
- From not recordedTo not recorded
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Approach · VFR pattern final
- First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- In flight collision with object
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Pilot in command › Descent, misjudged
- Pilot in command › Remedial action, delayed
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
THE PILOT OF THE UNREGISTERED EXPERIMENTAL HELICOPTER, WHO DID NOT HOLD AN FAA HELICOPTER PILOT CERTIFICATE, MISJUDGED HIS RATE OF DESCENT WHILE ON FINAL APPROACH TO THE YARD OF HIS PRIVATE RESIDENCE. CORRECTIVE ACTION WAS DELAYED BEYOND A POINT WHERE HE WAS ABLE TO AVOID CONTACTING THE ROOF OF A SMALL OUTBUILDING. AFTER CONTACTING THE OUTBUILDING, THE AIRCRAFT DESCENDED INTO THE GROUND.
Probable cause
A MISJUDGED DESCENT RATE, AND DELAYED CORRECTIVE ACTION. FACTORS INCLUDE A LACK OF EXPERIENCE IN THIS TYPE OF AIRCRAFT, AND A BUILDING NEAR THE LANDING AREA.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record SEA92LA156
- Event ID
- 20001211X15258
- Case number
- SEA92LA156
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: local date, investigation status. Values present in the bulk record are kept.
- The date is the local date; the NTSB stores the UTC date 1992-07-16.
- API snapshot SHA-256: f11b55c1e5a0459dd439a551c19e2fc089ef662db8c7a9c40e0ffe9d76100303; retrieved 2026-09-21T23:12:34.350Z.