# NTSB FTW84LA402: Cessna T210N, N6399Y, San Augustine, TX, September 26, 1984

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Limited investigation · Final report
- Date: September 26, 1984, 13:28 local (18:28 UTC)
- Place: San Augustine, TX
- Coordinates: 31.519086, -94.109695 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=31.5191&lon=-94.1097&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 21473
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW84LA402
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21473/pdf
- Page: https://openairdocs.org/ntsb/FTW84LA402

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(total) - mech failure/malf, cruise - normal
  - engine assembly,crankshaft - separation (cause)
  - engine assembly,crankshaft - fatigue (cause)
- Forced landing, descent - emergency
- In flight collision with object, descent - emergency
  - object - tree(s) (cause)
  - terrain condition - none suitable (contributing factor)
- Hard landing, landing - flare/touchdown
  - flare - misjudged, pilot in command (contributing factor)

## Analysis

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.

## Aircraft

- Registration: [N6399Y](https://openairdocs.org/deregistered/N6399Y-1985-05-15), registration cancelled 1985-05-15, S/N 21064365 (OpenAirDocs)
- Reported make and model: CESSNA T210N
- Registry model: [Cessna T210N](https://openairdocs.org/model/cessna-t210n) (registry code 2073456) (OpenAirDocs)
- Category: Airplane
- Serial number: 21064365
- Airframe hours: 7650
- Engines: CONTINENTAL TSIO-520-R 310 horsepower reciprocating
- Damage: Destroyed
- Fire: On-Ground
- Flight: Business, Part 91
- Registered owner: Snyder Equipment Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, June 20, 1984, 66 hours before
- Departed: SGF, SPRINGFIELD, MO
- Destination: BPT, BEAUMONT, TX
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 24; flight instructor, commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 831 total, 180 in this make and model, 722 as pilot in command, 69 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Instrument (IMC), Day
- Wind: 350° at 7 knots
- Visibility: 2 statute miles
- Lowest ceiling: 500 ft overcast
- Temperature: 70 °F, dew point 66 °F
- Altimeter: 30.00 inHg
- Observed at: LFK, 30 nm away

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19840926054849A](https://openairdocs.org/incident/19840926054849A), Sep 26, 1984: Cessna T210N, San Augustine, TX, Destroyed. Lost power and engine vibration during IFR cruise flight. Fire after field landing. Broken crankshaft.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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