A military plane had been reported flying low near where a Lincolnshire horse rider was found fatally injured, an inquest has been told.
Anne Smith, 50, from Scawby Brook, was found with a head injury at a roadside near Market Rasen in October 2004.
The inquest at Lincoln Magistrates Court heard there had been reports of a Hercules conducting a exercise nearby.
Mrs Smith died from a head injury, consistent with from falling from a horse or being stepped on by a horse.
Several witnesses described seeing the plane at various heights between 60 and 250ft moments before she was found.
A close friend who had been riding with Mrs Smith on the day of the accident told the inquest Mrs Smith's horse was flighty and unpredictable at times and had bolted before.
The inquest continues on Friday.