ASN Wikibase Occurrence # 215117
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| Date: | Friday 22 November 1985 |
| Time: | 10:29 |
| Type: |  Cessna 172N |
| Owner/operator: | |
| Registration: | VH-UWD |
| MSN: | |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Location: | Tebin Station, QLD -
 Australia
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Tebin Station, QLD |
| Quilpie, QLD | |
| Investigating agency: | BASI |
| Confidence Rating: |  Accident investigation report completed and information captured |
At about 200 feet above ground level after takeoff, the engine began to vibrate and lose power. The pilot turned the aircraft to the right to position over more suitable terrain. The aircraft was stalled into small trees and bushes before touching down heavily on the nose wheel, which broke off. The aircraft then overturned and came to rest inverted. The power loss was caused by two engine exhaust valves sticking open. Although the valves were found to have been set at the minimum recommended clearance, a build up of combustion residue was present which probably restricted valve movement. Operations in high ambient temperatures involving slow flight and reduced engine cooling at rich mixtures can promote a combustion residue build up reducing valve guide clearance and resulting in valve sticking. The aircraft had been operating in the western Queensland summer conducting sheep survey operations.
Accident investigation:
 |
|
Sources:
https://www.atsb.gov.au/publications/investigation_reports/1985/aair/aair198503542/
https://www.atsb.gov.au/media/30897/aair198503542.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Sep-2018 11:36 | Pineapple | Added |
Corrections or additions? ... Edit this accident description
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