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) |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative: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:
|
| |
Investigating agency: | NTSB |
Report number: | LAX96LA152 |
Status: | Investigation completed |
Duration: | 10 months |
Download report: | Final report |
|
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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