Skinner Leasing Cessna 206 Undesignat accident
Cessna 206 Undesignat · Accident: loss of engine power (total) while maneuvering
From Rogue Valley International-Medford Airport (MFR) to Rogue Valley International-Medford Airport (MFR)
Event
- NTSB case
- WPR19LA217
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- Charter & commuter
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Cessna 206 Undesignat
- Aircraft type
- Cessna 206
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N5152U
- Operator
- Skinner Leasing
- Onboard fatalities
- Unknown
- Route
- From Rogue Valley International-Medford Airport (MFR), Medford, ORTo Rogue Valley International-Medford Airport (MFR), Medford, OR
- Aircraft age
- About 55 years (built 1964)
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 135: Air Taxi & Commuter
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Maneuvering · low-altitude flying
- Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Loss of engine power (total)
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Aircraft › Aircraft power plant
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
About 2.8 hours into the fire reconnaissance mission flight, the pilot heard a loud bang followed by violent shaking of the airplane. The pilot believed the airplane was at an altitude of about 1,500-2,000 ft. above the ground. The pilot retarded the propeller control to extend his glide distance while he looked for a place to land. The airplane touched down in a swamp and during the landing, the left wing and fuselage were substantially damaged. A postaccident examination of the engine revealed extensive damage to the no. 1 cylinder, piston, and connecting rod. The no. 1 cylinder valve guide rods broke through the crankcase, and the rear counterweight and counterweight lobe were broken free from the crankshaft. Numerous metal pieces and shavings were noted in the oil pan including: a broken counterweight, crankshaft counterweight attachment, counterweight retainer pin, damaged retainer pin plates, damaged retainer plate spring clips, and engine casing pieces. One of the damaged retainer pin plates displayed a deep groove, the approximate diameter of a counterweight pin. It is likely that the counterweight retaining pin rotated over time on the counterweight retainer pin plate, causing it to wear down and eventually fail. When the plate failed, the counterweight retainer pin moved from its position and impacted the no. 1 piston rod, causing the counterweight lobe to fracture and the engine to lose power.
Probable cause
The failure of the counterweight retainer pin plate which resulted in a total loss of engine power.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record WPR19LA217
- Event ID
- 20190811X34546
- Case number
- WPR19LA217
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: local date, investigation status, cause areas. Values present in the bulk record are kept.
- The date is the local date; the NTSB stores the UTC date 2019-08-10.
- API snapshot SHA-256: 70a347a38049c96bd0b1615b787b760bf385032ed1e328c52d7e9d5a65a44b78; retrieved 2026-09-16T09:42:24.635Z.