NTSB Identification: CHI90DEV08.
The docket is stored on NTSB microfiche number 42111.
Accident occurred Friday, August 03, 1990 in MOWEAQUA, IL
Probable Cause Approval Date: 09/21/1992
Aircraft: HILVETY CWII, registration: N7176J
Injuries: 1 Minor.

THE PILOT REMOVED, CLEANED AND REINSTALLED SPARK PLUGS BEFORE FLIGHT. ABOUT 150 FEET INTO INITIAL CLIMBOUT FROM TAKEOFF, THE PILOT STATES THE ENGINE LOST POWER AS IF RUNNING ON ONLY ONE OF THE TWO CYLINDERS. THE PILOT STATES HE ATTEMPTED TO TURN BACK TO THE RUNWAY AND LANDED THE AIRPLANE IN A MUSHED STALL. EXAMINATION OF THE ENGINE REVEALED ONE SPARK PLUG CABLE DISCONNECTED. THE ENGINE PERFORMED SATISFACTORILY WHEN THE CABLE WAS RECONNECTED.

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

THE PILOT'S FAILURE TO MAINTAIN FLYING SPEED AND STALLING THE AIRPLANE WHILE ATTEMPTING TO REVERSE COURSE FOR A FORCED LANDING. CONTRIBUTING TO THE ACCIDENT WAS THE PILOT'S FAILURE TO PROPERLY REINSTALL SPARK PLUG CABLES DURING SERVICING CONDUCTED PRIOR TO FLIGHT.

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