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NTSB Report
July 8, 1989 · Piper PA-25-235 · N6941Z
Goodway, AL
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 8, 1989
Injury Outcomes
1 injury (1 serious injury)
Location
Goodway, AL
Aircraft
Piper PA-25-235
Tail Number
N6941Z
Injuries
Serious
Aircraft Damage
Destroyed
NTSB Number
ATL89DKJ06
DURING AN AERIAL APPLICATION FLIGHT, THE LEFT WING SEPARATED AND THE AIRCRAFT HIT THE TOP OF A HOUSE. EXAMINATION OF THE WING REVEALED A FATIGUE FRACTURE IN THE WING'S LOWER SPAR CAP. METALLURGICAL EXAMINATION OF THE FRACTURE REVEALED THAT IT ORIGINATED ON OPPOSITE SIDES OF A RIVET HOLE. INTERGRANULAR CORROSION WAS FOUND AT ONE OF THE HIGH CYCLE FATIGUE FRACTURE ORIGINS. THE OPPOSITE FRACTURE ORIGIN HAD BEEN MECHANICALLY MUTILATED. IN AUG 1977, ALL-METAL WINGS WERE INSTALLED ON THE AIRPLANE PER A SUPPLEMENTAL TYPE CERTIFICATE.
NTSB Probable Cause
THE IN-FLIGHT SEPARATION OF THE LEFT WING WHICH FAILED BECAUSE OF A CORROSION INDUCED FATIGUE FRACTURE.
Full Narrative
DURING AN AERIAL APPLICATION FLIGHT, THE LEFT WING SEPARATED AND THE AIRCRAFT HIT THE TOP OF A HOUSE. EXAMINATION OF THE WING REVEALED A FATIGUE FRACTURE IN THE WING'S LOWER SPAR CAP. METALLURGICAL EXAMINATION OF THE FRACTURE REVEALED THAT IT ORIGINATED ON OPPOSITE SIDES OF A RIVET HOLE. INTERGRANULAR CORROSION WAS FOUND AT ONE OF THE HIGH CYCLE FATIGUE FRACTURE ORIGINS. THE OPPOSITE FRACTURE ORIGIN HAD BEEN MECHANICALLY MUTILATED. IN AUG 1977, ALL-METAL WINGS WERE INSTALLED ON THE AIRPLANE PER A SUPPLEMENTAL TYPE CERTIFICATE.
Flight
Event TypeAccident
Event Time17:30 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftPiper PA-25-235
Tail NumberN6941Z
Aircraft CategoryAir
DamageDestroyed
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-540-B2B5 · Reciprocating · 235
Seats1
People & Injuries
Injury Summary1 injury (1 serious injury)
Fatal0
Serious1
Minor0
Uninjured0
Total1
Crew 1Age 37 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0