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NTSB Reports is an independent research and search tool for public aviation accident and incident records. It brings NTSB aviation reports, structured fields, docket files, extracted figures, photos, videos, and update history into one searchable interface.

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September 26, 1984 · Cessna T210N · N6399Y

San Augustine, TX

Overview

Report Status
Preliminary report
Event Type
Accident
Date
September 26, 1984
Injury Outcomes
2 injuries (2 serious injuries)
Location
San Augustine, TX
Aircraft
Cessna T210N
Tail Number
N6399Y
Injuries
Serious
Aircraft Damage
Destroyed
NTSB Number
FTW84LA402

THE PILOT MADE A FORCED LANDING IN A FIELD WHILE ON A IFR FLIGHT AFTER HIS ENGINE FAILED. THE AIRCRAFT LANDED SHORT OF THE SELECTED TOUCHDOWN POINT, IMPACTED TREES AND EXPERIENCED A HARD LANDING. IT THEN CAUGHT FIRE AND BURNED. SUBSEQUENT ENGINE EXAMINATION REVEALED THE CRANKSHIFT SEPARATED DURING FLIGHT DUE TO HIGH CYCLIC METAL FATIGUE CRACKING. THE CRACK ORIGINATED ABOUT 0.044 INCH BELOW THE SURFACE IN THE RADIUS AT THE FORWARD END OF THE NO. 3 MAIN BEARING JOURNAL. THE ORIGIN OF THE FATIGUE CRACK WAS IN AN AREA WHICH WAS FREE OF MICROSTRUCTURAL DEFECTS. THE CRANKSHAFT MET THE ENGINEERINGSPECIFICATIONS FOR MATERIAL, HARDNESS, AND NITRIDE THICKNESS.

Full Narrative

THE PILOT MADE A FORCED LANDING IN A FIELD WHILE ON A IFR FLIGHT AFTER HIS ENGINE FAILED. THE AIRCRAFT LANDED SHORT OF THE SELECTED TOUCHDOWN POINT, IMPACTED TREES AND EXPERIENCED A HARD LANDING. IT THEN CAUGHT FIRE AND BURNED. SUBSEQUENT ENGINE EXAMINATION REVEALED THE CRANKSHIFT SEPARATED DURING FLIGHT DUE TO HIGH CYCLIC METAL FATIGUE CRACKING. THE CRACK ORIGINATED ABOUT 0.044 INCH BELOW THE SURFACE IN THE RADIUS AT THE FORWARD END OF THE NO. 3 MAIN BEARING JOURNAL. THE ORIGIN OF THE FATIGUE CRACK WAS IN AN AREA WHICH WAS FREE OF MICROSTRUCTURAL DEFECTS. THE CRANKSHAFT MET THE ENGINEERINGSPECIFICATIONS FOR MATERIAL, HARDNESS, AND NITRIDE THICKNESS.

Flight

Event TypeAccident
Event Time13:28 CDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledIFR
Aircraft FireGrd
Aircraft ExplosionNo

Aircraft

AircraftCessna T210N
Tail NumberN6399Y
Aircraft CategoryAir
DamageDestroyed
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · TSIO-520-R · Reciprocating · 310
Seats6

People & Injuries

Injury Summary2 injuries (2 serious injuries)
Fatal0
Serious2
Minor0
Uninjured0
Total2
Crew 1Age 24 · First Class

Conditions

ConditionsIMC
LightDaylight
Wind350° @ 7 kt
Visibility2 sm
CeilingOvercast 500 ft
Temperature / Dew Point70 F / 66 F
Altimeter30.00 inHg
Observation Time17:50
Weather SourceWFAC

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Appendix: Source Data