ASN Wikibase Occurrence # 39502
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| Date: | Tuesday 2 April 1996 |
| Time: | 11:58 LT |
| Type: |  Glasair |
| Owner/operator: | Bobby A. Hockett |
| Registration: | N59LP |
| MSN: | 156 |
| Total airframe hrs: | 1656 hours |
| Engine model: | Lycoming O-360-A1G |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Groveland, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | (Q68) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot (part owner of the aircraft) held an A&P certificate & had completed a condition/annual inspection of the aircraft before the flight. The aircraft co-owner stated there was a problem with the throttle cable, & the pilot was going to order a new one, but had not yet done so. Witnesses said the aircraft departed straight out after takeoff. About 4 minutes later, it entered a downwind to the pattern, low & very close to the runway. The witnesses estimated the aircraft's altitude was between 200 and 300 feet agl. At first, some witnesses thought the pilot was going to make a downwind landing on the runway. The witnesses said the aircraft made a tight turn from downwind to base. During the base-to-final turn, the right wing dropped, and the aircraft entered a nose-down descent and crashed. The witnesses heard the engine running before impact, but they described the sound as 'not full power.' An examination of the engine & controls revealed that a clip, which secured the accelerator pump plunger to its actuation shaft in the carburetor, was missing & the pump was inoperative. The throttle cable housing/actuating shaft at the carburetor end was found separated from the cable sheath, exposing the unsupported inside cable. A piece of welding rod was found bent around the housing end & taped to the sheath. The cable was removed from the aircraft & operationally tested. During push-pull tests, the carburetor end would sometimes move an amount corresponding to the cockpit end input; at other times, the carburetor end would move only slightly.
Probable Cause: the pilot's decision to fly the aircraft with a known mechanical discrepancy in the throttle linkage, which resulted in a partial loss of engine power; and his failure to maintain an adequate airspeed while maneuvering for an emergency landing, which resulted in an inadvertent stall/spin. Inadequate maintenance/annual inspection was a related factor.
Accident investigation:
 |
|
Sources:
NTSB LAX96LA152
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 09-Apr-2024 07:38 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Source, Narrative, Category, Accident report] |
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