NTSB Identification: NYC00LA134.
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Accident occurred Saturday, May 13, 2000 in KEYMAR, MD
Probable Cause Approval Date: 07/17/2001
Aircraft: Hing FLY BABY 1A, registration: N2685
Injuries: 1 Fatal.

NTSB investigators may have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

According to witnesses, the homebuilt Fly Baby was cruising about 1,500 feet above the ground, in a climb or nose high attitude. The witnesses reported hearing a popping sound, after which the right wing folded up next to the fuselage. The airplane descended, and struck the ground. Examination revealed the two flying wires on the underside of the forward right wing spar were separated from the wing. One wire had failed at its loop through the eye of the turnbuckle, and the other wire separated at a failed turnbuckle. Metallurgical examination found evidence of overload on both failures. According to the designer of the airplane, the airplane had been static load tested to 6gs with no failure. In addition, each pair of flying wires must have similar or matched tension. If one wire was loose, a momentary flight load could exceed the load capability of one wire, which would cause it to fail, followed by the failure of the second wire as it tried to assume the load. The pre-accident tension on the failed flying wires could not be determined.

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

An overload failure of both flying wires, on the underside of the right wing, while the airplane was climbing, due to improper balance between the two flying wires, by unknown person(s).

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