ASN Wikibase Occurrence # 292964
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| Date: | Friday 7 October 2005 |
| Time: | 14:00 LT |
| Type: |  Beechcraft G35 |
| Owner/operator: | Private |
| Registration: | N4647D |
| MSN: | D-4803 |
| Year of manufacture: | 1956 |
| Engine model: | Continental E225-8 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Longview, Washington -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Oak Harbor, WA (76S) |
| Eugene Airport, OR (EUG/KEUG) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was descending from 9,500 feet for weather, and while maneuvering around a cloud cell at 8,000 feet the airplane began to vibrate. He reduced power and rate of descent, and continued to his destination. After a normal landing, he discovered the "serious wrinkling" between the fuselage and the empennage. Postaccident evaluation of the airplane found no pre-existing cracking in the engine mounts; engine vibration analysis results were within limits. Ruddervator balance tests were also within limits. Radar data indicated that the airplane's maximum ground-track speed was 185 knots, or 213 mph. When this was corrected for altitude and winds aloft, the Investigator In Charge determined that the airplane's indicated airspeed should have been approximately 190 mph when it was descending through 8,000 feet. The airplane's Pilot's Operating Handbook (POH) states that this speed is in the airspeed indicator's yellow arc, or between 176 and 202 mph. The POH further states that maximum structural cruising speed (Vno) is 176 mph, and remarks, "Do not exceed this speed except in smooth air and then only with caution."
Probable Cause: Ruddervator flutter which resulted in the buckling of the empennage. The reason for the ruddervator flutter was undetermined.
Accident investigation:
 |
|
Sources:
NTSB SEA06LA004
History of this aircraft
Other occurrences involving this aircraft
| 21 June 2002 | N4647D | Private | 0 | Yakima, Washington | |
sub |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Oct-2022 14:23 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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