NTSB Identification: LAX95LA177.
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Accident occurred Tuesday, May 02, 1995 in RED BLUFF, CA
Probable Cause Approval Date: 09/24/1995
Aircraft: BEECH C23, registration: N6636R
Injuries: 2 Serious.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
THE PILOT SAID THAT WHEN HE TRIED TO MAKE A THROTTLE ADJUSTMENT IT HAD NO EFFECT ON THE ENGINE RPM. AFTER ENTERING DOWNWIND ABEAM HIS TOUCHDOWN POINT, HE SHUT DOWN THE ENGINE AND ATTEMPTED TO GLIDE THE REMAINDER OF THE DISTANCE. THE AIRCRAFT TOUCHED DOWN SHORT OF THE RUNWAY AND STRUCK AN EMBANKMENT. AN INSPECTION OF THE AIRCRAFT REVEALED THAT THE THROTTLE LINKAGE HAD SEPARATED FROM THE CARBURETOR THROTTLE ARM. THE BOLT, CASTELLATED NUT, AND WASHER WHICH SECURES THE ASSEMBLY TOGETHER WERE NOT PRESENT. THE ENGINE WAS REINSTALLED IN THE AIRCRAFT FOLLOWING A MAJOR OVERHAUL, 1 MONTH AND 2 OPERATING HOURS PRIOR TO THE ACCIDENT. AN ANNUAL INSPECTION WAS ALSO COMPLETED AND SIGNED OFF AT THAT TIME. THE MECHANIC WHO PERFORMED THE ENGINE REINSTALLATION SAID THAT THE BOLT HAD BEEN REINSTALLED AND THAT A COTTER PIN HAD ALSO BEEN INSTALLED IN THE PROCESS. THE MECHANIC WHO PERFORMED THE ANNUAL INSPECTION REPORTED THAT HE HAD NOT LOOKED THAT CLOSELY AT THE ENGINE SINCE IT HAD JUST BEEN INSTALLED AND INSPECTED BY ANOTHER MECHANIC. THE MANUFACTURER REPORTED THAT THE DESIGN OF THE ASSEMBLY DOES NOT PLACE LOADS ON THE BOLT THAT WOULD BE SUFFICIENT TO PRODUCE AN OVERLOAD FAILURE.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: the separation of the throttle linkage due to improper installation, and the pilot's misjudgement of the glide path necessary to reach the runway prior to shutting down the engine. Full narrative available
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