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NTSB Report
June 2, 1989 · Pitts S-1S · N64652
Henryetta, OK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 2, 1989
Injury Outcomes
1 injury (1 serious injury), 4 unknown outcomes
Location
Henryetta, OK
Aircraft
Pitts S-1S
Tail Number
N64652
Operator
Arsenault Donald S
Injuries
Serious
Aircraft Damage
Destroyed
NTSB Number
FTW89FA107
POWER LOSS OCCURRED DUE TO SEPARATION AND DEPARTURE OF LOWER 1/2 RT EXHAUST STACK. PLT MADE A FORCED LANDING ON THE 2 NORTHBOUND LANES OF A DIVIDED HWY. ON SHORT FINAL, THE ACFT STRUCK POWER LINES, CRASHED, AND SLID INTO A TRUCK TRAVELLING NORTH. A PASSENGER CAR, TRAVELLING SOUTH, BECAME ENTANGLED IN THE WIRES AND WAS SUBSEQUENTLY REAR ENDED BY ANOTHER BEHICLE. THE POWER LINE POLES WERE MASKED FROM VIEW BY TREES ON BOTH SIDES OF THE ROAD. EXAMINATION OF THE EXHAUST STACK REVEALED THAT IT HAD UNDERGONE EXTENSIVE POST-MANUFACTURE REPAIRS IN THE AREA OF THE SEPARATION. THERE WAS EVIDENCE OF EXTENSIVE WELD FUSION ZONE POROSITY IN THE AREA THAT HAD BEEN WELDED. WELD FUSION ZONE POROSITY HAS BEEN ATTRIBUTED IN THE PAST TO POOR SURFACE PREPARATION AND WELD REPAIR TECHNIQUES.
NTSB Probable Cause
AN ENGINE POWER LOSS DUE TO THE SEPARATION AND DEPARTURE OF AN EXHAUST STACK. THE STACK FAILED DUE TO POOR WELD. FACTOR(S) WAS: THE TERRAIN CONDITIONS OF THE SELECTED FORCED LANDING SITE.
Full Narrative
POWER LOSS OCCURRED DUE TO SEPARATION AND DEPARTURE OF LOWER 1/2 RT EXHAUST STACK. PLT MADE A FORCED LANDING ON THE 2 NORTHBOUND LANES OF A DIVIDED HWY. ON SHORT FINAL, THE ACFT STRUCK POWER LINES, CRASHED, AND SLID INTO A TRUCK TRAVELLING NORTH. A PASSENGER CAR, TRAVELLING SOUTH, BECAME ENTANGLED IN THE WIRES AND WAS SUBSEQUENTLY REAR ENDED BY ANOTHER BEHICLE. THE POWER LINE POLES WERE MASKED FROM VIEW BY TREES ON BOTH SIDES OF THE ROAD. EXAMINATION OF THE EXHAUST STACK REVEALED THAT IT HAD UNDERGONE EXTENSIVE POST-MANUFACTURE REPAIRS IN THE AREA OF THE SEPARATION. THERE WAS EVIDENCE OF EXTENSIVE WELD FUSION ZONE POROSITY IN THE AREA THAT HAD BEEN WELDED. WELD FUSION ZONE POROSITY HAS BEEN ATTRIBUTED IN THE PAST TO POOR SURFACE PREPARATION AND WELD REPAIR TECHNIQUES.
Flight
Event TypeAccident
Event Time15:15 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireIflt
Aircraft ExplosionNo
Aircraft
AircraftPitts S-1S
Tail NumberN64652
Aircraft CategoryAir
DamageDestroyed
OperatorArsenault Donald S
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-B2B · Reciprocating · 160
Seats1
People & Injuries
Injury Summary1 injury (1 serious injury), 4 unknown outcomes
Fatal0
Serious1
Minor0
Uninjured0
Total5
Crew 1Age 40 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind210° @ 9 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point70 F
Altimeter30.00 inHg
Observation Time19:53
Weather SourceWFAC