ASN Wikibase Occurrence # 354728
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| Date: | Wednesday 11 March 1998 |
| Time: | 13:45 LT |
| Type: |  Boeing 737-205 (Adv) |
| Owner/operator: | Arco Alaska, Inc. |
| Registration: | N733AR |
| MSN: | 23466/1236 |
| Total airframe hrs: | 24850 hours |
| Engine model: | P&W JT-8D |
| Fatalities: | Fatalities: 0 / Occupants: 81 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Anchorage, AK -
 United States of America
|
| Phase: | Standing |
| Nature: | Executive |
| Departure airport: | Prudhoe Bay, AK (PUO |
| (KANC) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During parking at the gate, the airplane's rudder began a rapid rudder oscillation which shook the entire airplane. Postincident testing determined that the rudder was oscillating approximately 1.5 degrees either side of centerline, solely within the authority of the yaw damper. No corresponding cockpit rudder pedal movement occurred. Further testing revealed a loss of grease to the yaw rate gyro spin bearings, and corresponding damage to the spin and gimbal bearings. The yaw damp coupler and gyro had accumulated 24,850 hours in service.
Probable Cause: The dynamic imbalance in the yaw rate gyro, which provided input to the yaw damper and rudder. A factor was the deteriorated grease in the gyro bearings.
Accident investigation:
 |
|
Sources:
NTSB ANC98IA026
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Mar-2024 17:39 | ASN Update Bot | Added |
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