ASN Wikibase Occurrence # 202167
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| Date: | Monday 19 April 1999 |
| Time: | 07:52 LT |
| Type: |  Grumman G-164B Ag-Cat |
| Owner/operator: | Onstott Dusters, Inc. |
| Registration: | N3633B |
| MSN: | 775B |
| Year of manufacture: | 1986 |
| Total airframe hrs: | 8199 hours |
| Engine model: | P&W PT6A-20 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Marysville, CA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot said that he had just taken off from a farm airstrip and was initiating a turn to clear a building when several 'pop' sounds came from the engine and it began to lose power. The pilot was unable to clear a set of power lines and struck the wires. Ground witnesses said they watched the aircraft liftoff from the airstrip and begin a gentle left turn to clear a building. In the turn a trail of black smoke began coming from the aircraft as it started a shallow descent toward a field. Just before the aircraft hit the power lines, a large puff of black smoke emanated from the aircraft. After colliding with the wires, the aircraft hit the ground and nosed over. The witnesses heard distinct 'popping sounds' associated with the onset of the smoke trail. The engine was removed and transported to a turbine engine overhaul facility for examination. Teardown of the engine revealed that one blade in the power turbine wheel had failed at the root section and was not recovered. Two other blades were fractured at their approximate midspan point and the outboard blade sections were not recovered. All other blades around the disk exhibited nicks and gouges in the leading edges. All fracture surfaces exhibited granular features. The compressor bleed valve would not hold pressure and was found to be leaking from the seal under the seal support plate-securing nut. Review of the engine maintenance records disclosed that the compressor bleed valve was installed on the engine 605 hours prior to the accident. Prior to installation on the engine, a new diaphragm was installed in the valve.
Probable Cause: A loss of engine power due to a leaking surge bleed valve which induced compressor stalls within the engine.
Accident investigation:
 |
|
Sources:
NTSB LAX99LA157
History of this aircraft
Other occurrences involving this aircraft
| 28 April 1987 | N3633B | Onstott Dusters, Inc. | 0 | Pleasant Grove, CA | |
sub |
| 9 February 1991 | N3633B | Onstott Dusters Inc. | 0 | Yuba City, CA | |
sub |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-Nov-2017 12:42 | ASN Update Bot | Added |
| 08-Apr-2024 06:57 | ASN Update Bot | Updated [Time, Aircraft type, Other fatalities, Phase, Source, Narrative, Accident report] |
Corrections or additions? ... Edit this accident description
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