ASN Wikibase Occurrence # 37100
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| Date: | Tuesday 9 June 1998 |
| Time: | 13:53 LT |
| Type: |  Cessna T210N |
| Owner/operator: | Private |
| Registration: | N199JM |
| MSN: | 21064010 |
| Year of manufacture: | 1980 |
| Total airframe hrs: | 3418 hours |
| Engine model: | Continental TSIO-520-R(9) |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Hillsboro, OR -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | Sun River, OR |
| Hillsboro, OR (KHIO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot-in-command reported a power loss on approach to the runway. The aircraft passed through the tops of trees approximately 150 feet beyond, and entered a stall/spin maneuver, impacting a power line and the ground approximately 2,800 feet short of the runway threshold. The flaps and landing gear were in a retracted position. Post-crash examination revealed the crankshaft separated in fatigue which originated from a circumferential gouge mark on the aft face of the #2 cheek at an area located outboard of the forward radius of the #1 rod journal. The circumferential gouge mark on the crankcheek was consistent with the connecting rod shifting forward during engine operation. The rub marks on the cheek walls of the #1 connecting rod were consistent with tight piston pin bushing to piston pin clearance. Additionally, the bushings for all the connecting rods were undersize. Airframe/engine logs revealed a top overhaul of the engine approximately 23 hours prior to the crankshaft failure, during which the piston pins were replaced but the connecting rod bushings were not. No dimensional check of the bushings was made or required at that time. The engine was overhauled 515 hours previous to the top overhaul. The manufacturer's overhaul manual specifies that the new bushings should be reamed to the specified (inside) diameter. Post-crash examination of the engine revealed non-standard connecting rod cotter keys and light fretting between the engine case halves.
Probable Cause: Improper installation (bushing), mechanical binding (bushing), mechanical binding (connecting rod), and fatigue within the crankshaft. Contributing factors were inadequate major (engine) overhaul and trees.
Accident investigation:
 |
|
Sources:
NTSB SEA98FA092
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 07-Apr-2024 11:02 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Destination airport, Source, Narrative, Category, Accident report] |
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