Susie Wolff will become the first woman driver in 22 years to take part in a Formula One grand prix weekend.
The 31-year-old Scot, is replacing Williams' regular Finnish driver Valtteri Bottas for first practice at the British Grand Prix.
The 90-minute session will be the closest she has come to ending a 38-year wait for a woman to actually race with the men but it could also be as far as she gets in that ambition with no plans for Wolff to get a race drive.
Wolff, is the wife of Mercedes motorsport head Toto who is also a Williams shareholder and made her test debut for the team at Silverstone last year.
Italian Lella Lombardi, in 1976, was the last woman to race in Formula One.
The last woman to take part in any stage of a grand prix weekend was Italian Giovanna Amati who tried and failed to qualify with the Brabham team in 1992.