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NTSB Report
January 27, 1991 · Hayes Kolb/Twinstar Kolb/Twins · N71817
Round Lake, NY
Overview
Report Status
Probable Cause
Event Type
Accident
Date
January 27, 1991
Injury Outcomes
1 injury (1 fatality)
Location
Round Lake, NY
Aircraft
Hayes Kolb/Twinstar Kolb/Twins
Tail Number
N71817
Injuries
Fatal
Aircraft Damage
Substantial
NTSB Number
NYC91DFA02
THE AMATEUR BUILT ACFT WAS ON ITS 1ST FLT AFTER BEING CONSTRUCTED. IT FLEW ABOUT 5 MIN BEFORE THE OWNER/BUILDER/PLT RETURNED THE PLANE FOR LANDING. AT ABOUT 75 FT AGL ON FINAL APCH, BOTH WINGS FAILED & THE ACFT CRASHED. INVESTIGATION REVEALED THAT STEEL BOLTS WERE MISSING FROM THE OUTBOARD WING STRUT ATTACHMENT FITTINGS, RIVETS THAT HELD THE OUTBOARD ATTACHMENT FITTINGS TO THE WING HAD SHEARED OFF. THE REASON FOR THE MISSING BOLTS AND SHEARED REVITS WAS NOT VERIFIED. THE ACFT HAD BEEN REGISTERED WITH THE FAA, BUT THERE WAS NO AIRWORTHINESS CERTIFICATE. ALSO, NO WEIGHT & BALANCE DATA WAS FOUND IN THE ACFT, THE PLT WAS NOT AN FAA CERTIFIED AIRMAN, NOR DID HE POSSESS A VALID FAA MEDICAL CERTIFICATE.
NTSB Probable Cause
IN-FLIGHT STRUCTURAL FAILURE OF THE OUTBOARD WING ATTACHMENT FITTINGS ON BOTH WINGS DUE TO AN UNDETERMINED REASON.
Full Narrative
THE AMATEUR BUILT ACFT WAS ON ITS 1ST FLT AFTER BEING CONSTRUCTED. IT FLEW ABOUT 5 MIN BEFORE THE OWNER/BUILDER/PLT RETURNED THE PLANE FOR LANDING. AT ABOUT 75 FT AGL ON FINAL APCH, BOTH WINGS FAILED & THE ACFT CRASHED. INVESTIGATION REVEALED THAT STEEL BOLTS WERE MISSING FROM THE OUTBOARD WING STRUT ATTACHMENT FITTINGS, RIVETS THAT HELD THE OUTBOARD ATTACHMENT FITTINGS TO THE WING HAD SHEARED OFF. THE REASON FOR THE MISSING BOLTS AND SHEARED REVITS WAS NOT VERIFIED. THE ACFT HAD BEEN REGISTERED WITH THE FAA, BUT THERE WAS NO AIRWORTHINESS CERTIFICATE. ALSO, NO WEIGHT & BALANCE DATA WAS FOUND IN THE ACFT, THE PLT WAS NOT AN FAA CERTIFIED AIRMAN, NOR DID HE POSSESS A VALID FAA MEDICAL CERTIFICATE.
Flight
Event TypeAccident
Event Time15:50 EST
Nearest AirportRound Lake (1nm N)
Runway14
Runway Length2000 ft
Runway Width60 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHayes Kolb/Twinstar Kolb/Twins
Tail NumberN71817
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsRotax · 503 · Reciprocating · 47
Seats2
People & Injuries
Injury Summary1 injury (1 fatality)
Fatal1
Serious0
Minor0
Uninjured0
Total1
Crew 1Age 38 · None
Conditions
ConditionsVMC
LightDusk
Wind315° @ 5 kt
Visibility7 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourceWIT