ASN Wikibase Occurrence # 134165
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Wednesday 3 July 2002 |
| Time: | 20:30 |
| Type: |  Grumman G-164B Ag-Cat |
| Owner/operator: | Nef Flying Service, Inc. |
| Registration: | N297AL |
| MSN: | 188B |
| Year of manufacture: | 1977 |
| Total airframe hrs: | 6500 hours |
| Engine model: | Pratt & Whitney R-1340 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Shelley, ID -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Shelley, ID |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot had just commenced a spray run when there was an abrupt loss of power accompanied by engine roughness and vibration. Unable to maintain flight, the pilot executed a forced landing into the field being sprayed, landing across the rough, furrowed terrain. Post crash examination revealed that the top of the number five cylinder had separated from the lower half of the cylinder. Further metallurgical examination revealed that the cylinder split circumferentially due to fatigue which originated at the first and second thread roots of the cylinder threads on the inside of the cylinder head. Dimensional examination revealed that the threads between the cylinder base and head had been improperly machined resulting in the cylinder's abutting surfaces not coming into complete contact during assembly of the two components.
Probable Cause: A loss of engine power due to the manufacturer's improperly machined threads, which prevented the cylinder base/head halves from being properly assembled, leading to fatigue propagation and the ultimate separation of the cylinder. A contributing factor was the rough terrain.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20020715X01126&key=1
History of this aircraft
Other occurrences involving this aircraft
| 14 March 1994 | N6665Q | Private | 0 | Hamburg, AR | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 09-Dec-2017 16:57 | ASN Update Bot | Updated [Other fatalities, Departure airport, Source, Narrative] |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation