ASN Wikibase Occurrence # 287505
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| Date: | Tuesday 7 August 2012 |
| Time: | 09:16 LT |
| Type: |  Cessna 177B |
| Owner/operator: | |
| Registration: | N34283 |
| MSN: | 17701748 |
| Total airframe hrs: | 2671 hours |
| Engine model: | Lycoming O-360-A1F6 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Evansville, Indiana -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Danville-Stuart Powell Field, KY (KDVK) |
| Evansville, IN | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported a loss of attitude reference and a subsequent loss of control during cruise flight in instrument meteorological conditions. About 15 minutes into the flight, the attitude indicator displayed a 30-degree right bank and the pilot's control inputs did not seem to correct the banked condition. The pilot subsequently noticed a 2,000 foot-per-minute descent with increasing airspeed. The attitude indicator and turn coordinator were displaying conflicting information, and the directional gyro was indicating a rapid heading change to the left. About 5,000 feet mean sea level, the airplane broke out of the clouds, and the pilot was able to regain control and landed without further incident. The pilot observed substantial damage to the wings after landing.
A postaccident examination of the attitude indicator revealed significant noise during testing, consistent with an impending gyro bearing failure. In addition, after the gyro was allowed to reach operating speed, it did not fully stabilize again after it was disturbed from equilibrium. Postaccident examination of the vacuum pump and airframe vacuum system did not reveal any anomalies.
Probable Cause: The pilot's loss of control due to an inaccurate attitude reference, which was caused by an impending ('in processâ€) failure of the bearing in the attitude indicator.
Accident investigation:
 |
|
Sources:
NTSB CEN12LA532
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Oct-2022 11:35 | ASN Update Bot | Added |
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