NTSB Identification: ATL05FA086.
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Accident occurred Monday, May 23, 2005 in Conway, SC
Probable Cause Approval Date: 10/27/2005
Aircraft: Piper PA-18-135, registration: N9951Q
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.

Two witnesses observed the banner tow airplane release its banner aerial sign at an airstrip adjacent to a highway. The airplane made a steep pitch up attitude followed by a steep left turn towards the highway at an altitude lower than the treetops. The left wing was described by one witness in a near vertical position with the ground before the nose of the airplane pitched down and the airplane collided with the ground. The OWNERS HANDBOOK, states in SECTION II, TAKE-OFF, CLIMB, AND STALLS,…"The gross weight power off stalling speed with full flaps in the Super Cub 135 is 38 M.P.H.; with flaps up the stalling speed increases about 4 M.P.H." Examination of the airframe, flight controls, engine assembly and accessories revealed no anomalies.

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

The pilot's failure to maintain airspeed while maneuvering after releasing a banner aerial sign, resulting in an inadvertent stall and collision with the ground. A factor in the accident was the flight instructor's improper supervision of the pilot receiving instruction.

Full narrative available

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