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NTSB Report
June 18, 1988 · Bellanca 7GCBC · N4129Y
Livermore Falls, ME
Overview
Report Status
Preliminary report
Event Type
Accident
Date
June 18, 1988
Injury Outcomes
2 injuries (2 fatalities)
Location
Livermore Falls, ME
Aircraft
Bellanca 7GCBC
Tail Number
N4129Y
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
NYC88FA167
THE CITABRIA 7GCBC WAS OBSERVED TO MAKE A LOOP. THE LEFT WING BENT UPWARD AT THE STRUT ATTACH POINT AS THE AIRCRAFT WAS AT THE BOTTOM OF THE LOOP AND RECOVERING TO LEVEL FLIGHT. THE AIRCRAFT WAS THEN OBSERVED TO DESCEND IN A RIGHT SPIRAL AND NOT RECOVER PRIOR TO CONTACT WITH THE GROUND. IMPROPER LEFT FWD WING SPAR MANUFACTURING WAS FOUND. NO PROBLEMS WERE NOTED ON THE LEFT REAR WING SPAR. THE FWD WING SPAR FAILED WITH TENSION ON THE TOP AND COMPRESSION ON THE BOTTOM. THE REAR WING SPAR HAD TENSION ON THE BOTTOM AND COMPRESSION ON THE TOP. THE LEFT WING OUTBOARD OF THE STRUT ATTACH POINT SEPARATED FROM THE AIRCRAFT PRIOR TO IMPACT. THE LEFT AILERON WAS BENT UPWARD 90 DEGREES AT THE MIDDLE HINGE POINT WHICH CORRESPONDS TO THE STRUT ATTACH POINT. INVESTIGATION REVEALED THAT THE SLOPE OF THE GRAIN ON THE FWD WING SPAR EXCEEDED SPECIFICATIONS. ALSO TWO AREAS OF POOR BONDING WERE FOUND. THE AIRCRAFT LOG BOOKS WERE NOT FOUND.
Full Narrative
THE CITABRIA 7GCBC WAS OBSERVED TO MAKE A LOOP. THE LEFT WING BENT UPWARD AT THE STRUT ATTACH POINT AS THE AIRCRAFT WAS AT THE BOTTOM OF THE LOOP AND RECOVERING TO LEVEL FLIGHT. THE AIRCRAFT WAS THEN OBSERVED TO DESCEND IN A RIGHT SPIRAL AND NOT RECOVER PRIOR TO CONTACT WITH THE GROUND. IMPROPER LEFT FWD WING SPAR MANUFACTURING WAS FOUND. NO PROBLEMS WERE NOTED ON THE LEFT REAR WING SPAR. THE FWD WING SPAR FAILED WITH TENSION ON THE TOP AND COMPRESSION ON THE BOTTOM. THE REAR WING SPAR HAD TENSION ON THE BOTTOM AND COMPRESSION ON THE TOP. THE LEFT WING OUTBOARD OF THE STRUT ATTACH POINT SEPARATED FROM THE AIRCRAFT PRIOR TO IMPACT. THE LEFT AILERON WAS BENT UPWARD 90 DEGREES AT THE MIDDLE HINGE POINT WHICH CORRESPONDS TO THE STRUT ATTACH POINT. INVESTIGATION REVEALED THAT THE SLOPE OF THE GRAIN ON THE FWD WING SPAR EXCEEDED SPECIFICATIONS. ALSO TWO AREAS OF POOR BONDING WERE FOUND. THE AIRCRAFT LOG BOOKS WERE NOT FOUND.
Flight
Event TypeAccident
Event Time17:18 EDT
Nearest Airport0nm
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBellanca 7GCBC
Tail NumberN4129Y
Aircraft CategoryAir
DamageDestroyed
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-A2D · Reciprocating · 150
Seats2
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 45 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind230° @ 8 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point46
Altimeter30.00 inHg
Observation Time20:50
Weather SourceWFAC