# NTSB ANC90FA097: Cessna 206, N7560G, Fairbanks, AK, June 27, 1990

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Field investigation · Final report
- Date: June 26, 1990, 20:30 local (Jun 27, 1990, 04:30 UTC)
- Place: Fairbanks, AK
- Location: 64.8378° N, 147.7164° W: Placed by OpenAirDocs: center of Fairbanks, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=64.8378&lon=-147.7164&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 1 uninjured
- Status: Completed, report November 9, 1992
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5297
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC90FA097
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5297/pdf
- Page: https://openairdocs.org/ntsb/ANC90FA097

## Probable cause

THE FAILURE OF THE WRISTPIN CAUSED THE SEPARATION OF THE CONNECTING ROD FROM THE PISTON AND SUBSEQUENT SEIZURE OF THE ENGINE. A FACTOR WAS UNAVAILABILITY OF A SUITABLE FORCED LANDING AREA.

## 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
  - engine assembly,other - failure,total (cause)
- Forced landing, descent - emergency
  - terrain condition - high vegetation (contributing factor)
  - terrain condition - rough/uneven (contributing factor)
- Nose gear collapsed, landing - roll
  - landing gear,nose gear - overload

## Analysis

WHILE IN CRUISE FLIGHT, THE PILOT-IN-COMMAND EXPERIENCED A COMPLETE MECHANICAL STOPPAGE OF THE POWERPLANT. HE WAS FORCED TO LAND IN A BURNED SECTION OF WOODLAND THAT HAD DEAD TREES SCATTERED THROUGHOUT AND ONTO ROUGH AND UNEVEN TUNDRA. SUBSEQUENT EXAMINATION OF THE ENGINE REVEALED THAT THE NUMBER 5 CYLINDER'S PISTON WRISTPIN HAD FAILED AND ALLOWED THE CONNECTING ROD TO SEPARATE FROM THE PISTON. THE CONNECTING ROD DAMAGED THE INTERNAL PORTIONS OF THE ENGINE CASE IN ITS PLANE OF ROTATION AND BY JAMMING INTO THE CASE CAUSED THE ENGINE TO STOP ROTATING.

## Aircraft

- Registration: N7560G (not matched to a registry record)
- Reported make and model: CESSNA 206
- Category: Airplane
- Serial number: U20604315
- Airframe hours: 2926
- Engines: CONTINENTAL IO-520-F 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Bill A. Jones
- Airworthiness certificate: Standard, Normal
- Last inspection: Continuous airworthiness, May 1, 1990, 76 hours before
- Airport: NONE

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 65; private; airplane ratings: single-engine land; medical: class 3, invalid medical for flight; seat: left; flight hours: 2,000 total, 300 in this make and model, 2,000 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 75 °F

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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