NTSB Identification: LAX91LA410.
The docket is stored on NTSB microfiche number 45589.
Accident occurred Friday, September 27, 1991 in SAN CARLOS, CA
Probable Cause Approval Date: 05/26/1993
Aircraft: PIPER PA-28-161, registration: N2520U
Injuries: 2 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.

THE PILOT REPORTED THAT THE AIRPLANE WAS BEING FLOWN FOR THE FIRST TIME SINCE REPLACEMENT OF SEVERAL MAJOR ENGINE COMPONENTS. AFTER A SUCCESSFUL RUN-UP, THE AIRCRAFT DEPARTED THE AIRFIELD. DURING THE INITIAL CLIMB AT ABOUT 100' AGL, THE ENGINE BEGAN TO RUN ROUGH AND THEN LOST TOTAL POWER. A FORCED LANDING WAS MADE TO A WET, MUDDY AREA. THE AIRCRAFT CAME TO A SUDDEN STOP IN THE MUDDY AREA. AN EXAMINATION BY AN FAA INSPECTOR DETERMINED THAT THE ENGINE'S NUMBER 3 INTAKE VALVE FAILED. THE MODE OF FAILURE COULD NOT BE DETERMINED.

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

THE FAILURE OF THE NUMBER 3 INTAKE VALVE RESULTING IN A TOTAL LOSS OF ENGINE POWER. A FACTOR IN THIS ACCIDENT WAS THE UNSUITABLE TERRAIN FOR LANDING THE AIRCRAFT.

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