Incident Overview
An agricultural aircraft was spraying fungicide on a field when the flagman, stationed on top of a dike at the west end of the field, was struck by the right spray boom. The flagman, who was using an umbrella, stood 12 feet above the field level.
Operational Details
Standard procedure required the flagman to remain in position until the aircraft was 300 feet away, then move 16 steps north for the next spray run. On this occasion, the flagman had moved only eight steps when the end of the right spray boom struck him.
Pilot's Account
The pilot stated that a residue left on the windshield from previous spray applications might have obscured his view while initiating the turn-around maneuver.
Injuries
The collision resulted in a serious head injury to the flagman.