# NTSB MKC83LA137: Cessna T188C, N9639J, Marshall, MO, June 27, 1983

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: June 27, 1983, 18:45 local (23:45 UTC)
- Place: Marshall, MO
- Coordinates: 39.110607, -93.200576 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.1106&lon=-93.2006&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 33427
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC83LA137
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33427/pdf
- Page: https://openairdocs.org/ntsb/MKC83LA137

## 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 - fatigue (cause)
- Forced landing, maneuvering - turn to landing area (emergency)
  - load jettison - performed, pilot in command
- In flight collision with object, maneuvering - turn to landing area (emergency)
  - object - tree(s) (contributing factor)

## Analysis

THE ENG FAILED WHILE ENROUTE TO SPRAY. THE ACFT WAS OBSERVED TO JETTISON ITS LOAD PRIOR TO IMPACTING TREES IN A WOODED PASTURE. METALLURGICAL EXAMINATION REVEALED THAT THE CRANKSHAFT, P/N631716, HAD FRACTURED FROM FATIGUE PROGRESSION THROUGH THE FORWARD CHEEK OF THE #3 MAIN BEARING JOURNAL. INITIATION HAD OCCURRED 0.047 INCHES BELOW THE FORWARD RADIUS SURFACE. NO METALLURGICAL ABNORMALITIES WERE FOUND AT THE ORIGIN SITE.

## Aircraft

- Registration: N9639J (not matched to a registry record)
- Reported make and model: CESSNA T188C
- Category: Airplane
- Serial number: T188030T
- Airframe hours: 115
- Engines: CONTINENTAL TSIO-520-T 310 horsepower reciprocating
- Damage: Destroyed
- Fire: On-Ground
- Flight: Aerial application, Part 137
- Registered owner: Dyer The Flyer, Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, October 11, 1982

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 45; flight instructor, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 15,037 total, 50 in this make and model, 14,909 as pilot in command, 150 in the last 90 days, 75 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 200° at 8 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 86 °F, dew point 66 °F
- Altimeter: 29.00 inHg
- Observed at: MKC, 65 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 19830627027219A](https://openairdocs.org/incident/19830627027219A), Jun 27, 1983: Cessna T188C, Marshall, MO, Destroyed. Engine failed at a low altitude en route to spray field. Struck trees and burned. Crakshaft had failed.

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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