NTSB Identification: LAX83FA124.
The docket is stored on NTSB microfiche number 22991.
Accident occurred Saturday, March 05, 1983 in SIMI, CA
Aircraft: THORP T-18, registration: N3124
Injuries: 1 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 ACFT CRASHED IN A SCHOOL PLAYGROUND IN A STEEP UNCONTROLLED DESCENT. WITNESSES SAID THE ACFT WAS OBSERVED IN A 60 DEGREE NOSE DOWN ATTITUDE AT ABOUT 1000 FT AGL AND THIS CONTINUED UNTIL GROUND IMPACT. THE ENGINE WAS PRODUCING HIGH POWER AT THIS TIME. NO WITNESSES SAW THE ACFT BEFORE THE DIVE. EXAMINATION REVEALED THAT THE COCKPIT CONTROL STICK HAD FAILED AND THE AILERON AND STABILATOR CROSS-BAR RIGHT MOUNTING POST TUBE WELDED AREA FAILED PRIOR TO THE ACCIDENT. A PRE-EXISTING CRACK HAD EXISTED FOR SOME TIME ON THE CROSS-BAR TUBE WHEN THIS TUBE FAILED THE FLT CONTROLS JAMMED WHICH PREVENTED THE PLT FROM CONTROLLING THE ACFT.

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

FLIGHT CONTROL,STABILATOR ATTACHMENT..FAILURE,TOTAL

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

MAINTENANCE,ANNUAL INSPECTION..INADEQUATE..OTHER MAINTENANCE PERSONNEL

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

LACK OF TOTAL EXPERIENCE IN KIND OF AIRCRAFT..PILOT IN COMMAND

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

FLIGHT CONTROL,STABILATOR ATTACHMENT..FATIGUE

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