NTSB Identification: LAX88FA061.
The docket is stored on NTSB microfiche number 36785.
Accident occurred Saturday, November 28, 1987 in SAN MARCOS, CA
Probable Cause Approval Date: 06/07/1989
Aircraft: PIPER PA-11, registration: N4767H
Injuries: 2 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE 2 PLTS TOOK OFF ON AN INSTRUCTIONAL FLT WHICH WAS TO BE A BIENNIAL FLT REVIEW FOR THE ACFT OWNER. DURING THE FLT, THE PLTS FLEW TO A DIRT STRIP ON A SADDLEBACK BETWEEN 2 MTN PEAKS NEAR SAN MARCOS. SUBSEQUENTLY, THE ACFT STRUCK A BOULDER & CRASHED NEAR THE NORTHEAST END OF THE STRIP. THERE WERE NO KNOWN WITNESSES TO THE ACDNT. THERE WAS EVIDENCE THE ACFT HAD STRUCK THE BOULDER AFTER THE PLTS MADE A LOW PASS OVER THE STRIP ON A NORTHEASTERLY HDG. THE ACFT CAME TO REST ABOUT 30 FT NORTHEAST OF THE BOULDER WITH EXTENSIVE DAMAGE. THE PROP BLADES CONTAINED CHORDWISE SCORING & MASSIVE SMEARING OR LEADING EDGE DAMAGE. NO PREIMPACT MECHANICAL PROBLEM WAS EVIDENT. AN EXAM OF THE RWY REVEALED NO INDCN OF THE ACFT TOUCHING DOWN BEFORE IMPACT. EVIDENCE WAS INCONCLUSIVE AS TO WHICH PLT WAS MANIPULATING THE CONTROLS WHEN THE ACDNT OCCURRED. ON THIS FLT, THE OWNER WAS CONSIDERED TO BE THE PLT-IN-COMMAND.

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

PROPER ALTITUDE..NOT MAINTAINED..PILOT IN COMMAND

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

SUPERVISION..INADEQUATE..CHECK PILOT


Contributing Factors

LOW PASS..PERFORMED

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