# NTSB MKC84LA282: Cessna T210M, N761YR, Breckenridge, MO, September 22, 1984

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: September 21, 1984, 20:10 local (Sep 22, 1984, 01:10 UTC)
- Place: Breckenridge, MO
- Coordinates: 39.759735, -93.800842 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.7597&lon=-93.8008&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 3 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 33796
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC84LA282
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33796/pdf
- Page: https://openairdocs.org/ntsb/MKC84LA282

## 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,other - failure,total (cause)
  - maintenance - improper, pilot in command (cause)
- Forced landing, descent - emergency
- Hard landing, landing - flare/touchdown
- Nose over, landing - roll

## Analysis

ON A VFR X-COUNTRY FLT THE ACFT EXPERIENCED AN ENG FAILURE AND THE PLT EXECUTED A NIGHT EMERGENCY LANDING INTO A SOY BEAN FIELD. INVESTIGATION REVEALED THAT A COUNTERWEIGHT PIN CAME OUT OF THE CRANKSHAFT COUNTERWEIGHT DUE TO A FAILURE OF A LOCK RING RESULTING IN AN OVERLOAD SHEAR OF A LOOSE COUNTERWEIGHT INSIDE THE ENG.

## Aircraft

- Registration: N761YR (not matched to a registry record)
- Reported make and model: CESSNA T210M
- Category: Airplane
- Serial number: 21062629
- Airframe hours: 1823
- Engines: CONTINENTAL TSIO-520-R1B 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: North Missouri Surgical
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, May 6, 1984
- Departed: IRK, KIRKSVILLE, MO
- Destination: MCI, KANSAS CITY, MO

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 55; private; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 3,065 total, 222 in this make and model, 2,850 as pilot in command, 68 in the last 90 days

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 180° at 10 knots
- Visibility: 15 statute miles
- Lowest ceiling: 12,000 ft broken
- Temperature: 70 °F

## 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 19840921053119A](https://openairdocs.org/incident/19840921053119A), Sep 21, 1984: Cessna T210M, Breckenridge, MO, Substantial damage. A crankshaft counterweight came off causing progressive engine failure. Aircraft overturned during night landing.

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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