NTSB Identification: CHI94LA299.
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Accident occurred Thursday, August 25, 1994 in PROLE, IA
Probable Cause Approval Date: 02/14/1995
Aircraft: ROBERT ELDON IDLER TIERRA-2, registration: N6161Q
Injuries: 2 Minor.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

DURING CRUISE FLIGHT, THE TWO-SEAT REGISTERED ULTRALIGHT AIRCRAFT ENCOUNTERED THE GUST FRONT FROM AN APPROACHING THUNDERSTORM WHICH WAS LOCATED 7 TO 15 MILES AWAY. THE ULTRALIGHT ENTERED AN UNCOMMANDED RIGHT DESCENDING BANK, WHICH THE PILOT COULD COULD NOT ARREST WITH FULL OPPOSITE AILERON INPUT. THE ULTRALIGHT IMPACTED TREES AND WAS DESTROYED.

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

the airplane's encounter with the outflow (gust front) from an approaching thunderstorm. Factors were the pilot's inaccurate evaluation of the gust front location, and the inability of the airplanes flight control system to compensate for the rolling moment.

Full narrative available

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