# NTSB SEA83FA018: Stinson 108-3, N6943M, Lynnwood, WA, November 13, 1982

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: November 13, 1982, 15:40 local (23:40 UTC)
- Place: Lynnwood, WA
- Coordinates: 47.799179, -122.279388 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.7992&lon=-122.2794&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed, report November 13, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 71523
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA83FA018
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/71523/pdf
- Page: https://openairdocs.org/ntsb/SEA83FA018

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, maneuvering
  - ignition system,magneto - fatigue (cause)
  - ignition system,magneto - failure,total (cause)
- Forced landing, landing - flare/touchdown
- In flight collision with object, landing - flare/touchdown
  - object - tree(s) (contributing factor)

## Analysis

THE ENG FAILED APPROACHING THE ARPT AT LOW ALTITUDE. THE ACFT STRUCK TREES DURING A DESCENDING TURN TOWARD A POWER COMPANY RIGHT-OF-WAY. INVESTIGATION REVEALED THAT THE IMPULSE DRIVE SPRINGS ON BOTH MAGNETOS HAD FAILED IN FATIGUE. THE SPRINGS ARE NOT ASSIGNED A SERVICE LIFE LIMIT. REJECTION CRITERIA DURING MAGNETO OVERHAUL PERTAINS TO DISTORTION OF COIL SYMMETRY & OBVIOUS SIGNS OF WEAR. NO RECORD COULD BE FOUND OF REPLACEMENT OF THE MAGNETO IMPULSE SPRINGS. IT IS POSSIBLE THAT THEY WERE ORIGINAL EQUIPMENT DATING TO 1948.

## Aircraft

- Registration: [N6943M](https://openairdocs.org/deregistered/N6943M-1984-11-19), registration cancelled 1984-11-19, S/N 108-4943 (OpenAirDocs)
- Reported make and model: STINSON 108-3
- Registry model: [Stinson 108-3](https://openairdocs.org/model/stinson-108-3) (registry code 9230408) (OpenAirDocs)
- Category: Airplane
- Serial number: 4943
- Airframe hours: 325
- Engines: FRANKLIN 6A4-165-B3 165 horsepower reciprocating
- Damage: Destroyed
- Flight: Personal, Part 91
- Operator: Ward L. Miller
- Registered owner: Ward L. Miller
- Departed: S13, LYNNWOOD, WA
- Destination: S13, LYNNWOOD, WA
- Airport: S13, Martha Lake

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; private; airplane ratings: single-engine land, single-engine sea; medical: unknown, valid medical--no waivers/lim.; flight hours: 219 total, 93 in this make and model, 156 as pilot in command, 1 in the last 90 days, 1 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 30 statute miles
- Temperature: 39 °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 19821113058409A](https://openairdocs.org/incident/19821113058409A), Nov 13, 1982: Univar 1083, Lynnwood, WA, Destroyed, 1 fatal. Aircraft crashed in a residential area after engine failure. Impulse drive springs on both magnetos were broken.

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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