# NTSB SEA90LA062: Stinson 108-2, N9443K, Hillsboro, OR, April 5, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: April 5, 1990, 00:23 local (07:23 UTC)
- Place: Hillsboro, OR
- Coordinates: 45.579353, -122.910163 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.5794&lon=-122.9102&mi=10
- Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report February 12, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 41184
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA90LA062
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/41184/pdf
- Page: https://openairdocs.org/ntsb/SEA90LA062

## Probable cause

PILOT DISPLAYED POOR STARTING PROCEDURES BY PROCEEDING WITH KNOWN DEFICIENCIES WITH THE PARKING BRAKE AND THE INADEQUACIES OF THE TIE DOWN. THE PILOT DID NOT ATTAIN ASSISTANCE FOR THIS PROCEDURE WHICH RESULTED IN THE AIRPLANE GETTING AWAY AND COLLIDING WITH TWO PARKED AIRPLANES.

## Sequence of events

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

- Loss of control - on ground/water, taxi
  - landing gear,parking brake - inadequate (contributing factor)
  - tie down - inadequate (contributing factor)
  - proper assistance - not attained, pilot in command (contributing factor)
  - starting procedure - poor, pilot in command (cause)
  - operation with known deficiencies in equipment, pilot in command (contributing factor)
- On ground/water collision with object, taxi
  - object - aircraft parked/standing (contributing factor)

## Analysis

THE PILOT REPORTED THAT HE HAD SECURED THE TAIL OF THE AIRPLANE WITH A TIE DOWN CHAIN, SET THE PARKING BRAKE AND ADJUSTED THE THROTTLE TO 550 RPM'S. THE PILOT THEN PROCEEDED TO HAND PROP THE ENGINE. THE ENGINE STARTED AND THE PILOT BEGAN TO WALK AROUND THE AIRPLANE WHEN HE NOTED THAT THE AIRPLANE STARTED FORWARD MOVEMENT. THE AIRPLANE OVERRODE THE PARKING BRAKE AND BROKE THE TIE DOWN CHAIN. THE PILOT SLIPPED AND WAS UNABLE TO GET INSIDE THE COCKPIT. THE AIRPLANE PROCEEDED FORWARD AND COLLIDED WITH TWO PARKED AIRPLANES.

## Aircraft

- Registration: [N9443K](https://openairdocs.org/aircraft/N9443K), registered now, S/N 108-2443, built 1947 (OpenAirDocs)
- Reported make and model: STINSON 108-2
- Registry model: [Universal Stinson 108-2](https://openairdocs.org/model/universal-stinson-108-2) (registry code 9230416) (OpenAirDocs)
- Registry engine: [Franklin 6A4165 series](https://openairdocs.org/engine/franklin-6a4165-series) (registry code 27025, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 108-2443
- Airframe hours: 2800
- Engines: FRANKLIN 6A4-165-B3 165 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Larry & Danna Knox
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, July 14, 1989, 34 hours before
- Airport: HIO, Hillsboro

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 49; private; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; flight hours: 350 total, 45 in this make and model, 310 as pilot in command, 22 in the last 90 days, 10 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/bright
- Wind: calm
- Lowest ceiling: none
- Temperature: 50 °F

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19900405007799A](https://openairdocs.org/incident/19900405007799A), Apr 5, 1990: Univar 1082, Portland, OR, Substantial damage. Parking brake on tail tied. Hand propped engine started. Tie down broke, aircraft ran into two parked aircraft.

## Other investigations on N9443K (1)

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.

- [NTSB OAK69D0279](https://openairdocs.org/ntsb/OAK69D0279), Mar 29, 1969: Stinson 108-2 (N9443K), Clarksburg, CA, substantial damage

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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