NTSB preliminary report cites pilot error as cause of Tiffany crash in Lake Wausau

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A preliminary National Transportation Safety Board report says pilot Leonard Boltz’s error caused the Beech K35 crash while carrying Republican gubernatorial candidate Tom Tiffany from La Crosse to Wausau, with both occupants rescued after swimming to shallow water with minor injuries.
Boltz told his aviation mechanic the loss of engine power resulted from a delayed fuel‑tank switch and failure to activate the electric fuel boost pump, and the investigation found the left main tank empty while the right main and auxiliary tanks remained full and caps were secure.