# NTSB SEA92LA156: Thomsen, Horst Rotorway "EXEC", Quilcene, WA, July 16, 1992

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: July 15, 1992, 19:20 local (Jul 16, 1992, 02:20 UTC)
- Place: Quilcene, WA
- Coordinates: 47.820045, -122.840377 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.8200&lon=-122.8404&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report August 31, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 42856
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA92LA156
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/42856/pdf
- Page: https://openairdocs.org/ntsb/SEA92LA156

## 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.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- In flight collision with object, approach - vfr pattern - final approach
  - descent - misjudged, pilot in command (cause)
  - remedial action - delayed, pilot in command (cause)
  - lack of total experience in type of aircraft, pilot in command (contributing factor)
  - object - building(nonresidential)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

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.

## Aircraft

- Registration: UNREG (not matched to a registry record)
- Reported make and model: THOMSEN, HORST ROTORWAY "EXEC" (ROTORWAY ")
- Category: Helicopter, amateur-built
- Airframe hours: 14
- Engines: UNKNOWN UNKNOWN unknown
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Thomsen, Horst
- Registered owner: Thomsen, Horst
- Last inspection: Unknown, January 2, 1900

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 51; private; airplane ratings: single-engine land, single-engine sea; medical: class 3, invalid medical for flight; seat: left; flight hours: 140 total, 8 in this make and model

## Weather

- Conditions: Visual (VMC), Day

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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