ASN Wikibase Occurrence # 370546
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| Date: | Monday 28 August 2000 |
| Time: | 11:50 LT |
| Type: |  Cessna T210N |
| Owner/operator: | Private |
| Registration: | N6993N |
| MSN: | 21063202 |
| Year of manufacture: | 1979 |
| Total airframe hrs: | 2420 hours |
| Engine model: | Continental TSIO-520-R |
| Fatalities: | Fatalities: 0 / Occupants: 6 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | COUNCIL, ID -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | SLATE CREEK, ID (1S7) |
| BOISE, ID (KBOI) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While in cruise flight, the turbocharged aircraft's manifold pressure began to drop. Although the engine continued to run smoothly, the pilot elected to divert to an alternate airport in order to check things out. When the aircraft was about four miles from the alternate airport, the engine began to run rough, and ultimately ceased producing power. Although the pilot was able to touch down in an open field short of the airport, during the landing roll, the nose wheel encountered an area that had been softened by irrigation, and the aircraft nosed over. During the investigation it was determined that the crankshaft failed due to fatigue crack initiation in the number two main journal cheek. Further inspection revealed that a sealant had been applied to the mating faces of the main bearing saddles the last time the engine was overhauled. Application of this sealant, which is not called for in the engine overhaul manual, lead to a loss of proper crankcase clamping pressure in the area of the main bearing saddle through-bolts. Loss of this pressure resulted in bearing shift and scoring of the crankshaft journal.
Probable Cause: the fatigue failure of the crankshaft due to improper overhaul procedures. Factors include a soft area in the field where the forced landing took place.
Accident investigation:
 |
|
Sources:
NTSB SEA00LA173
History of this aircraft
Other occurrences involving this aircraft
| 14 June 1985 | N6993N | Executive Air Charter, Inc | 0 | Mineral Wells, TX | |
w/o |
| 14 June 2013 | N6993N | Scott Patrick | 0 | Salmon, Idaho | |
sub |
| Gear collapse | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Mar-2024 11:51 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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