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NTSB Report
June 4, 1989 · Cushing 4 · N5321U
Mansfield, WA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 4, 1989
Injury Outcomes
2 injuries (2 fatalities)
Location
Mansfield, WA
Aircraft
Cushing 4
Tail Number
N5321U
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
SEA89FA099
THE LEFT WING OF THE HOMEBUILT SEPARATED IN FLIGHT. THE WING MAIN SPAR WAS A HEAVY WOODEN BEAM WITH METAL REINFORCEMENT PLATES BOLTED TO THE FORE AND AFT SURFACES THAT EXTENDED THROUGH THE AIRCRAFT CABIN. THE SPAR WAS FOUND BROKEN ADJACENT TO THE LEFT SIDE OF THE CABIN, THROUGH BOLT HOLES AT THE METAL REINFORCEMENT BRACKETS. THE WOOD SPLINTERS IN THE FRACTURED SPAR WERE BENT TOWARD THE TOP SURFACE OF THE WING. THERE WAS NO EVIDENCE OF FATIGUE CRACKING OR DRY ROTTING.
NTSB Probable Cause
FAILURE OF THE LEFT WING MAIN SPAR DUE TO OVERLOAD FOR UNDETERMINED REASONS.
Full Narrative
THE LEFT WING OF THE HOMEBUILT SEPARATED IN FLIGHT. THE WING MAIN SPAR WAS A HEAVY WOODEN BEAM WITH METAL REINFORCEMENT PLATES BOLTED TO THE FORE AND AFT SURFACES THAT EXTENDED THROUGH THE AIRCRAFT CABIN. THE SPAR WAS FOUND BROKEN ADJACENT TO THE LEFT SIDE OF THE CABIN, THROUGH BOLT HOLES AT THE METAL REINFORCEMENT BRACKETS. THE WOOD SPLINTERS IN THE FRACTURED SPAR WERE BENT TOWARD THE TOP SURFACE OF THE WING. THERE WAS NO EVIDENCE OF FATIGUE CRACKING OR DRY ROTTING.
Flight
Event TypeAccident
Event Time13:15 PDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCushing 4
Tail NumberN5321U
Aircraft CategoryAir
DamageDestroyed
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsGm · CORVAIR 110 · Reciprocating · 110
Seats2
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 67 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind270° @ 13 kt
Visibility30 sm
CeilingNone
Temperature / Dew Point45 C
Altimeter30.00 inHg
Observation Time19:55
Weather SourceWFAC