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| Date: | Sunday 10 January 1999 |
| Time: | 14:30 LT |
| Type: |  Cessna 207(F) |
| Owner/operator: | Village Aviation, Inc. |
| Registration: | N6312H |
| MSN: | 20700478 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 10286 hours |
| Engine model: | Continental IO-520-F |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Other fatalities: | 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | 1,6 km SE of Quinhagak AP, AK -
 United States of America
|
| Phase: | Approach |
| Nature: | Unknown |
| Departure airport: | Bethel, AK (BET) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The certificated commercial pilot reported that during the initial descent to land, the engine began to run rough and lose power. He noted that the roughness improved momentarily, followed by a severe engine vibration, and complete loss of engine power. The pilot selected a forced landing area on snow and tree-covered terrain. The airplane sustained substantial damage to the landing gear, fuselage, and wings. Postaccident investigation discovered that the engine crankshaft had sustained a complete fracture of the #2 cheek. A subsequent investigation revealed that on some crankshafts, a crack in the nitride layer that originated from a shallow tool mark, would in some cases ultimately lead to the fatigue failure of the crankshaft cheek. On April 22, 1999, the FAA issued an emergency airworthiness directive (AD) requiring that all TCM 470, 520, and 550 engine crankshafts manufactured in 1998, with less than 300 hours in service, will be inspected in accordance with the TCM critical service bulletin (CSB) within 10 hours of operation.
Probable Cause: Loss of engine power due to fracture of the engine crankshaft, and the manufacturer's improper manufacturing procedure during engine assembly. Factors associated with the accident were the manufacturer's inadequate quality control standards, trees, and snow-covered terrain.
Accident investigation:
 |
|
Sources:
NTSB ANC99FA021
History of this aircraft
Other occurrences involving this aircraft
| 7 November 2011 | N6314H | Era Alaska | 0 | Kwigillingok Airport - PAGG, Kwigillingok, AK | |
sub |
| Bounced on landing | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Feb-2015 12:11 | harro | Added |
| 09-Feb-2015 12:19 | harro | Updated [Embed code, Narrative, ] |
| 09-Feb-2015 22:33 | Geno | Updated [Aircraft type, Location, Departure airport, Source, ] |
| 23-Feb-2017 14:54 | TB | Updated [Date, Time, Aircraft type, Registration, Cn, Operator, Total occupants, Location, Country, Phase, Nature, Departure airport, Destination airport, Source, Embed code, Damage, Narrative, ] |
| 25-Nov-2017 12:47 | ASN Update Bot | Updated [Time, Cn, Operator, Nature, Departure airport, Destination airport, Source, Narrative, ] |
| 14-Dec-2017 16:55 | ASN Update Bot | Updated [Cn, Operator, Nature, Departure airport, Destination airport, Narrative, ] |
| 08-Apr-2024 10:55 | ASN Update Bot | Updated [Time, Other fatalities, Phase, Source, Narrative, Category, Accident report, ] |
Corrections or additions? ... Edit this accident description
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