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Aviation safety reports, made easier to study

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February 1, 1992 · Aero Mercantil S A Gavilan 358 EL-1 Gavilan 35 · 3500Z

Columbus, MS

Overview

Report Status
Probable Cause
Event Type
Accident
Date
February 1, 1992
Injury Outcomes
1 injury (1 minor injury)
Location
Columbus, MS
Aircraft
Aero Mercantil S A Gavilan 358 EL-1 Gavilan 35
Tail Number
3500Z
Operator
Aero Mercantil S A
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
MIA92LA076

WHILE DESCENDING TO LAND, THE ENG QUIT. ATTEMPTS TO RESTART WERE UNSUCCESSFUL. THE ACFT COLLIDED WITH TREES DURING THE LANDING ROLL FOLLOWING THE FORCED LANDING. THE ACFT WAS RECOVERED & TAKEN TO A FACILITY WHERE THE ENG WAS REMOVED FOR EXAMINATION. EXAMINATION OF THE ENGINE REVEALED THAT THE CRANKSHAFT FAILED NEAR THE REAR MAIN BEARING. ALSO, EVIDENCE INDICATES THAT THE REAR MAIN BEARING SPUN IN ITS SUPPORT AND WAS PARTIALLY EXTRUDED INTO THE ACCESSORY SECTION. EXAMINATION OF THE CRANKCASE HALVES ADJACENT TO THE REAR MAIN BEARING INDICATED FRETTING. THE ENG HAD ACCUMULATED 174 HRS SINCE NEW. METALLURGICAL EXAMINATION OF THE CRANKSHAFT REVEALED THAT IT FAILED DUE TO HIGH CYCLE FATIGUE.

NTSB Probable Cause

FATIGUE FAILURE OF THE CRANKSHAFT DUE TO IMPROPER ENGINE ASSEMBLY BY THE MANUFACTURER.

Full Narrative

WHILE DESCENDING TO LAND, THE ENG QUIT. ATTEMPTS TO RESTART WERE UNSUCCESSFUL. THE ACFT COLLIDED WITH TREES DURING THE LANDING ROLL FOLLOWING THE FORCED LANDING. THE ACFT WAS RECOVERED & TAKEN TO A FACILITY WHERE THE ENG WAS REMOVED FOR EXAMINATION. EXAMINATION OF THE ENGINE REVEALED THAT THE CRANKSHAFT FAILED NEAR THE REAR MAIN BEARING. ALSO, EVIDENCE INDICATES THAT THE REAR MAIN BEARING SPUN IN ITS SUPPORT AND WAS PARTIALLY EXTRUDED INTO THE ACCESSORY SECTION. EXAMINATION OF THE CRANKCASE HALVES ADJACENT TO THE REAR MAIN BEARING INDICATED FRETTING. THE ENG HAD ACCUMULATED 174 HRS SINCE NEW. METALLURGICAL EXAMINATION OF THE CRANKSHAFT REVEALED THAT IT FAILED DUE TO HIGH CYCLE FATIGUE.

Flight

Event TypeAccident
Event Time14:29 CST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftAero Mercantil S A Gavilan 358 EL-1 Gavilan 35
Tail Number3500Z
Aircraft CategoryAir
DamageSubstantial
OperatorAero Mercantil S A
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · TIO-540-W2A · Reciprocating · 350
Seats2

People & Injuries

Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 46 · First Class

Conditions

ConditionsVMC
LightDaylight
Wind350° @ 6 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point61 F / 28 C
Altimeter30.00 inHg
Observation Time20:00
Weather SourceWFAC

Appendix: Source Data