NTSB Identification: ATL90FA153.
The docket is stored on NTSB microfiche number 44518.
Accident occurred Thursday, August 02, 1990 in SOUTHPORT, NC
Probable Cause Approval Date: 03/12/1993
Aircraft: PIPER PA-18, registration: N9239T
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.

AFTER ENTERING AN INTENTIONAL SPIN MANEUVER, WITNESSES REPORTED THAT THE SPIN IMMEDIATELY BECAME 'FLAT'. THE SPIN CONTINUED FOR ABOUT 7 TO 8 TURNS PRIOR TO GROUND IMPACT. REPORTEDLY, THE NOSE DROPPED SLIGHTLY DURING THE LAST TURN OF THE SPIN. WEIGHT AND BALANCE CALCULATIONS INDICATE THAT THE AIRCRAFT SHOULD HAVE BEEN INSIDE UTILITY CATEGORY LIMITATIONS DURING THE ACCIDENT FLIGHT. THE REASON FOR THE SPIN BECOMING FLAT, AND THE PILOT'S FAILURE TO RECOVER CONTROL OF THE AIRPLANE WAS NOT DETERMINED.

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

THE ENTRY INTO A FLAT SPIN WHICH PRECLUDED RECOVERY BY THE PILOT. THE REASON FOR THE SPIN BECOMING FLAT COULD NOT BE DETERMINED.

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