Mark Wilson, 51, from Thorley Park in Bishops Stortford, appeared at Chelmsford Crown Court earlier.
The charges relate to his time as a fire training officer in Witham in 1989 and 1990.
Essex County Fire and Rescue Service said Mr Wilson, who served as West Area Commander, had been suspended from duty while legal proceedings take place.
He is due to stand trial at the same court in April next year.
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