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NTSB Report
November 13, 1982 · Stinson 108-3 · N6943M
Lynnwood, WA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
November 13, 1982
Injury Outcomes
2 injuries (2 fatalities)
Location
Lynnwood, WA
Aircraft
Stinson 108-3
Tail Number
N6943M
Operator
Ward L Miller
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
SEA83FA018
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.
Full Narrative
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.
Flight
Event TypeAccident
Event Time15:40 PST
Nearest AirportMartha Lake (0nm N)
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftStinson 108-3
Tail NumberN6943M
Aircraft CategoryAir
DamageDestroyed
OperatorWard L Miller
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsFranklin · 6A4-165-B3 · Reciprocating · 165
Seats4
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 43 · Unknown
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility30 sm
CeilingNone
Temperature / Dew Point39 C / 0 C
Altimeter0