NTSB Identification: LAX00LA062.
The docket is stored in the Docket Management System (DMS). Please contact Records Management Division
Accident occurred Sunday, January 02, 2000 in DOS PALOS, CA
Probable Cause Approval Date: 12/14/2001
Aircraft: Cessna 172A, registration: N7249T
Injuries: 1 Minor.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

While en route to the practice area, the student pilot performed several practice turns. She noted a loss of altitude, added throttle to regain altitude, but did not receive corresponding power indication. She checked the fuel selector to make sure it was in the on position, and then checked the engine gages. No discrepancies were noted. Carburetor heat was applied with no response and the rpm's continued to drop. She crosschecked the engine instruments, and reapplied carburetor heat with no change. With the rpm's continuing to drop, she made an emergency landing in a plowed dirt field. The engine was inspected, and it was noted that the retaining nut that attaches the serrated throttle lever to the serrated throttle shaft of the carburetor was loose, and the cotter pin was missing. The serrated portion of the throttle lever was unable to properly engage with the serrated stop of the throttle shaft. The carburetor had been replaced during the annual inspection on June 6, 1999, to comply with Airworthiness Directives. No further discrepancies were noted.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

A partial loss of engine power due to the failure of maintenance personnel to properly install and safety the throttle arm to the carburetor throttle shaft.

Full narrative available

Index for Jan2000 | Index of months