Airplane’s Encounter With A Dust Devil, Which Resulted In A Loss Of Airplane Control At A Low Altitude Analysis: The pilot reported that while conducting a slow flight maneuver for flight testing purposes in an unregistered airplane, he felt a “heavy push up” on the airplane to about 75 ft above ground level. The right wing then lifted and the pilot lost control of the airplane which entered a left descending spiral. The airplane subsequently impacted terrain and came to rest inverted.
