NTSB Identification: CHI91LA155.
The docket is stored on NTSB microfiche number 44071.
Accident occurred Saturday, May 11, 1991 in CRESTON, IA
Probable Cause Approval Date: 03/09/1993
Aircraft: PIPER J3, registration: N88441
Injuries: 1 Uninjured.

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 ACCIDENT AIRPLANE COLLIDED WITH ROUGH UNEVEN TERRAIN DURING A FORCED LANDING, AFTER LOSING PARTIAL ENGINE POWER DURING A PERSONAL FLIGHT. THE EXPERIMENTAL (EXHIBITION) CERTIFICATED AIRPLANE WAS SUBSTANTIALLY DAMAGED. THE ACCIDENT AIRPLANE HAD BEEN EXTENSIVELY MODIFIED BY REDUCING THE WINGSPAN AND THE INSTALLATION OF AN ENGINE MODIFIED FOR FUEL INJECTED OPERATION. NO PROVISIONS FOR INDUCTION SYSTEM HEATING OR A MEANS OF PROVIDING AN ALTERNATE AIR SOURCE WERE INCLUDED IN THE MODIFICATION. NO DEFECTS WERE DISCOVERED IN THE AIRFRAME OR POWERPLANT.

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

ICING IN THE INDUCTION AIR CONTROL SYSTEM.

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