NTSB Identification: FTW90FA170.
The docket is stored on NTSB microfiche number 42331.
Accident occurred Wednesday, August 29, 1990 in SHREVEPORT, LA
Probable Cause Approval Date: 11/09/1992
Aircraft: Air & Space 18A, registration: N6132S
Injuries: 2 Uninjured.

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 PIC STATED THAT AT LIFTOFF A SEVERE LATERAL VIBRATION OCCURRED CAUSING LOSS OF CONTROL OF THE GYROPLANE. WITNESSES REPORTED AN ERRATIC PORPOISING PITCHING MOTION. THE AIRCRAFT CAME TO REST APPROXIMATELY 1,500 FEET AFTER CONTROL WAS LOST, WHICH WAS AT THE POINT OF ATTEMPTED LIFTOFF. AS A RESULT OF FLAPPING, TWO OF THE THREE ROTOR BLADES CONTACTED THE PROPELLER AND RUDDER. ALTHOUGH NOT RECOMMENDED BY THE MANUFACTURER, THE FRONT SEAT WAS OCCUPIED BY A PILOT RATED PASSENGER WITH NO GYROPLANE EXPERIENCE. DURING SUBSEQUENT FLIGHT TESTING, TAKEOFF WAS PERFORMED UNDER SIMILAR CONDITIONS. IMPROPER TECHNIQUES DURING ATTEMPTED LIFTOFF RESULTED IN ERRATIC OSCILLATION AND ROTOR RPM DECAY. NO MECHANICAL MALFUNCTION WAS DISCOVERED.

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

FAILURE OF THE PILOT IN COMMAND TO FOLLOW PUBLISHED TAKEOFF PROCEDURES.

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