ASN Wikibase Occurrence # 131718
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| Date: | Tuesday 6 August 1991 |
| Time: | 10:00 LT |
| Type: |  Alvarez Polliwagen |
| Owner/operator: | Clifton E. Dixon |
| Registration: | N256PW |
| MSN: | 1 |
| Total airframe hrs: | 3 hours |
| Engine model: | Volkswagen 411/914 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Chesterfield, VA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT WAS CONDUCTING ONE OF A SERIES OF FLIGHT TESTS OF HIS NEW HOMEBUILT AIRCRAFT. AFTER PERFORMING HIS PRETAKEOFF ENGINE RUN-UP, HE STARTED HIS TAKE-OFF ROLL. THE ENGINE PERFORMANCE SEEMED BETTER THAN USUAL UP TO AN ALTITUDE OF 200 FEET. THE ENGINE THEN STARTED TO LOSE POWER AND THE AIRCRAFT BEGAN TO DESCEND. THE AIRCRAFT STRUCK SOME TREE TOPS AND CRASHED TO THE GROUND, COMING TO REST, INVERTED. A POSTFLIGHT INVESTIGATION OF THE ENGINE REVEALED THAT THE NUMBER THREE EXHAUST VALVE SPRING HAD SLIPPED FROM ITS POSITION CAUSING A PARTIAL REDUCTION OF POWER.
Probable Cause: THE PARTIAL LOSS OF ENGINE POWER CAUSED BY A MISALIGNED ROCKER ARM SPRING RESULTING IN A REDUCTION OF EXHAUST VALVE OPENING.
Accident investigation:
 |
|
Sources:
NTSB BFO91LA074
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 11-Apr-2024 13:05 | ASN Update Bot | Updated [Time, Aircraft type, Other fatalities, Phase, Source, Narrative, Category, Accident report] |
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