ASN Wikibase Occurrence # 59668
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| Date: | Friday 24 April 2009 |
| Time: | 16:45 |
| Type: |  Epic LT |
| Owner/operator: | Private |
| Registration: | N653SB |
| MSN: | 025 |
| Year of manufacture: | 2008 |
| Total airframe hrs: | 72 hours |
| Engine model: | Pratt & Whitney PT6-67A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Columbia River, Astoria, Oregon -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Astoria Regiona, OR (KAST) |
| Boeing Field, WA (KBFI) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During a climb to en route cruise, the airplane's engine lost almost all power, and the pilot had to ditch in a river because he was unable to glide back to the departure airport. The power loss was due to a minimum fuel flow command from the fuel control unit as a result of the seizure of the fuel control flyweights. The seizure of the flyweights was due to their contamination with residue from a failed fuel control tachometer drive bearing. The bearing failed due to its preload spacer being machined incorrectly, and due to the failure of the assembling technician to detect the anomaly at the time the fuel control was assembled.
Probable Cause: The partial loss of engine power during climb to cruise due to the failure of the engine's fuel control unit. Contributing to the accident was the incorrect machining of an internal component of the fuel control unit, and the failure of the assembling technician to correctly inspect the unit's assembly.
Accident investigation:
 |
|
Sources:
NTSB
https://flightaware.com/live/flight/N653SB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Apr-2009 21:35 | slowkid | Added |
| 24-Apr-2009 21:38 | slowkid | Updated |
| 27-Apr-2009 21:34 | slowkid | Updated |
| 13-Oct-2013 07:45 | MarkStep | Updated [Source] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 01-Dec-2017 18:54 | ASN Update Bot | Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative] |
Corrections or additions? ... Edit this accident description
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