- Date
- August 18, 1991, 21:30 local (Aug 19, 1991, 04:30 UTC)
- Place
- Nimrod, OR
- Injuries
- 2 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N35831Cessna U206F
- Weather
- Visual (VMC) · Night/dark
- Status
- Completed · report May 7, 1993
- Report
- Approved by Office Director
- FAA report
- 19910818038359A
- Case key
- 41516
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
The fractured crankshaft resulting in engine seizure followed by a forced landing on rough and uneven terrain resulting in separation of the nose gear.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
While in cruise flight the engine began running rough and ultimately seized. The pilot executed a forced landing during dark night conditions onto rough and uneven terrain within a logging clearcut area. During the rollout the nose gear was sheared off and the aircraft nosed over to an inverted position resulting in substantial damage. Subsequent disassembly of the engine revealed a fatigue crack which generated into a fracture of the crankshaft. The crack was observed to emanate from the oil tube passage hole in the number four short cheek of the crankshaft.
Aircraft
- Registration
- N35831
- Reported as
- Cessna U206F
- Category
- Airplane
- Serial number
- U20602744
- Airframe hours
- 3,116
- Engine
- Continental IO-520-F, 300 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Operator
- Evergreen Helicopters
- Registered owner
- Evergreen Helicopters
- Last inspection
- 100 hour · May 2, 1991 · 19 hours before
- Departed
- 5S2 · Crescent Lake, OR
- Destination
- MMV · Mcminnville, OR
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 30
- Certificates
- Flight instructor, Airline transport
- Airplane ratings
- Multi-engine land, Single-engine land
- Instrument ratings
- Airplane
- Medical
- Class 1, Valid Medical--no waivers/lim.
- Flight hours
- 4,400 total · 500 in this make and model · 3,650 as pilot in command · 250 in the last 90 days · 80 in the last 30 days · 2 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Night/dark
- Wind
- 260° at 10 knots
- Visibility
- 15 statute miles
- Lowest ceiling
- None
- Temperature
- -0 °F, dew point -0 °F
- Observed at
- EUG, 34 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.
Other investigations on N35831 · 1
Matched to the same aircraft by N-number and date.